@@miljororforsprakpartiet290 Or the statement is always true. If a better video is made today, he could truthfully say, "It took literally 11 years to find the best explanation of RAID online..". The statement can always be true, due to the qualifier, "best".
@@pvern78 Subjectively, but not objectively. A normal RAID article (i.e. basic understanding of the words "cloning" and "splitting"), at least for a normal IQ person, takes shorter to understand than the length of this video.
@@miljororforsprakpartiet290 yes. Again, the "best" modifier makes the statement subjective. It would be extremely hard, if not impossible, to objectively determine the "best" video on any specific topic.
@@pvern78 Video? Sir, he mentioned the whole fucking internet. If he has really scanned the whole of Internet, and hasn't found one single article as easy to understand, his opinion has no relevance anyway.
So glad I subscribed! Thank you so much for these high quality videos. They're all crystal clear to me. I watch them multiple times so I can get all the information! I thank you for your hard work!
I am a visual learner and the animation really helps. Understood it in an instant, only that it took me 4 different videos for me to finally your video :(
wow, imagine you are a teacher, your students would learn everything you ever have to offer in 1 day lol. love it and helped so much, THANK YOU kindly friend on the internet!
If you cannot explain a complicated matter simply, then you haven't understood it yourself yet either. This.... this is simplifying something that has baffled me for the longest of times with such ease that it's nothing short of amazing. Great job. Sure, there are other people that explain things with much, much more technical detail, but I generally don't walk out of those feeling like I actually understood anything.
nice video - Our typical server setup has 8 drives. We put the OS on drives 0&1 with Raid 1, then the database data on drives 2,3,4,5 and 6 with Raid 6, and use drive 7 as a global hot spare. Not the best for performance, but we sleep well knowing we have minimal chance for data loss. I've also considered using drives 2,3,4&5 with Raid 5 with disks 6&7 performing global hot spare service (or disk 6 being dedicated hot spare to the first container, and disk 7 being dedicated hot spare for the second container), to get a little better write performance, but our environment trickles data to the RAID slowly, (control system data), and then engineers will pull massive amounts of data over time, so we like the compromise we've implemented.
Incredible content. Currently studying for my Security + 601 Exam and the animation showing the difference between each RAID helped a bunch. Thank you so much!
PowerCert, if you could give further explanation on how parity works, as well as how does data restoration occurs from it, I think it would be appreciated by the community
why does no ever explain how the "parity" block stores data to rebuild failed drives? every video glosses over it like its common knowledge. call me an idiot because I missed that lesson sadly
Your informations are too good for technology beginners . I can understand your effords on your videos ...Your lessons are very much pretty to understand those subjects .. I wish you should have more viewers on your channel. Please keep up your effords for us .. Thanks for your videos.
Very informative and concise. Sounds like RAID 5 is probably the way to go since a 2 disk failure is unlikely, faster write speeds, less required resources .
Ben Jake Yep. But bear in mind that the probability of multiple drive failures increases as you increase the number of drives (purely on the cumulative effects of probability, not because it affects reliability of drives). RAID6 is really more about higher availability.
You're missing one VERY important difference between RAID5 and RAID6: If a disk fails in RAID5, you can only read from the remaing disks, until the broken disk is replaced - you cannot write to the disk, greatly reducing the usability of the remaining disks, untal a replacement disk is insteted and rebuild. In RAID6 you can still write to the remaining disks, if a disk fails, meaning, you can still use the system while waiting for a new disk to be obtained, insterted and rebuild.
so, looks like Raid 6 and 10 are the same as capacity still lost half. But Raid 10 good for Higher server like company. for home use like me, I needed backup data of family pictures and video. should I choose Raid 5 or 6 ? If one of the hard drive fail I still can recover the data. Budget is low. If I go with Raid 5. and the storage space have 5, can I later put in 2 more? or this would not work with raid 5 ? Thanks Now, If I setup raid 6, use 4 hard drive. 5th space is a waste right? so just buy 4 rack/case only? how about I saw some guy on youtube turn his old mid case into a Raid storage? I have an old desktop that ran on window xp or so. Can I use the mother board and run it Raid 6? or The Raid motherboard is different? I understand that from my labtop can not connect to the 2nd pc to access data. is there a video or instruction about this? Thanks a lot guys...
Currently studying for the A+ (1001) It took a while to fully wrap my head around RAID. But today I found your explanation and it cleared up a lot! You have a real gift. There’s a good balance of explaining concisely while visually showing how these processes work. Thank you so much for making these available for us!
RAID 6 exists not for two drives failing under normal situations but in the situation of a single drive dialing and then the rebuilding process stressing the remaining drives pushing another drive over the edge during the long rebuild times modern high capacity drives require. Keep in mind that when you create a RAID volume, you’re using drives of similar vintage. When one drive fails it usually means the others are not far behind. Expect more drive failures. Usually when a drive fails after several years of use it’s a good time to migrate all the storage to a newer, faster, higher capacity RAID. THe double redundancy helps assure the migration can complete before more drives die.
Here is my question. In raid 5 if you lose a disk How do you know which drive is bad If you are on a Desktop system that has Raid on it? Because all drives are the same size and all look the same.
You forgot to explain how parity re-writes the broken disk. Since parity is written only at a 1:3 ratio the only way to recover the data is using a mathematical algorithm to extrapolate the missing data. Since this does not mirror data like in a RAID 1, its pretty clever that data bits can spit out more data than it actually physically stored on the party disk. Super crazy!
I see now why most people opt for RAID 10 instead of 6 even though you have a higher likelihood of losing data. Since even though both RAID 10 and 6 can do UP to 2 failures (say if a disk goes and rebuilding it taking place and during that time another disk goes too). The caveat of RAID 10 is that it's only takes one PER "sub" disk set (since RAID 10 is REALLY RAID 1 arrays stripped across with RAID 0). So unless your data is literally mission critical RAID 6 is indeed garbage.
Im having a question like this "A customer has requested a four-drive NAS device. The system needs to be capable of full system reconstruction in the event of two failed drives. Which of the following should be configured to meet this requirement?" Options are RAID: 0, 1, 5, 10 and according to the answer is RAID 5. I was thinking RAID 10. RAID 6 is not even an option
So to compare to RAID4: RAID5 is similar to RAID4 but RAID4 had dedicated disk for parity and data was on N-1 disks so the parity disk was a bottleneck because every write to any data disk involved corresponding write to parity disk.
So with RAID 6, let’s say I have data divided between drives A & B, and parity on drives C & D… I get that I am recover if I lose both parity OR one parity and one data. But what happens if I lose both data… and just have two copies of parity. How can I rebuild? Or are the parities different… not both XORs of A and B?
What if i would have 10x 1TB drives and i want to be a possible 3 of the drives fail. So i would have 7TB to use, "what RAID is that called" then or is it even possible to do? And sorry, English isn't my 1 language.
The one thing that is missing from the video is expansion!!! If I have 8 drives how much is allocated to parity??? Great job otherwise!! Now I have to go find the answer......
A few questions You said systems like Raid 5 can store a large amount of data.But how is raid 5 different than any other storage capacity? If you have a 1gb file, weather it's on 1 drive or spread amongst 3,isn't it the same size ? 2.) If there is disk parity and a drive fails, how does the other drives know to rebuild information they never had ? Am I understanding that correctly? So if a file is striped among 3 drives and drive 3 fails,how do 1 and 2 rebuild the file that was on 3 if they never had it?
Somehow this is recommended to me in 2024.... Seems to me the video was lacking an explanation about how the parity works. Leaving it as "magic" takes away from what you were trying to get across. Just my $0.02
I used to work in I.T.. 20 years ago. Does RAID 4 still exist? It was same as RAID 5 but with the parity all on one disk, not striped across disks. So if you lost the parity disk, the other disks still had their complete data striped across the other disks. If you lost one of the data disks, then the parity would rebuild the lost data on a new blank drive.
Thanks for the great video! From what I gathered, RAID 6 appears to provide great fault tolerance because it can recover from 2 disks failing. Yet the video mentions that RAID 5 is the more prevalent than RAID 6. Is this because it is not very common for multiple disks to fail in practice, or simply because RAID 5 came out before RAID 6? Is write performance generally more valued over robust fault tolerance?
I think your question answers itself. It depends on system design and budgeting. Is fault tolerance more important for you application? Or you care more about writing your data faster to the database so it is highly consistent?
does raid 5 require same size? i have 2 x 300gb and 4 x 900gb is this ok for raid 5 configuration, for this configuration what would be the total size ? thanks
Not sure how I came across these short, clearly explained PowerCert videos. Sure would have like to have this when I was in the business. Most books, classroom learning far to complicated and boring.
Video 1.13, data d,f,i,l is on disk3. If that this fail what is happening with data. How we not lose that data? I understamd process of rebuilding using parity on new/replaced disk but what with data when this disk goes down? How we are able to still have it, i mean to read data immediatly even one disk failed
you completely missed the point about the one big main advantage why to rather chose raid 6 over raid 5: fault tolerance while rebuild what you explained is correct - but you example is very misleading - as, as you said, it'S unlikely two drives fail at the same time the main advantage is that in a raid 6 while you rebuilding one failed drive another drive could go bad and you are still able to fully rebuild the array after replacing the second failed drive - this where raid 6 is the big player im comparison to raid 5 cause with a raid 5 array you have to gamble with the critical state while rebuild a failed drive - this should be re-done to focus more on that very specific difference
The animation is wrong from 2:47 on. (I guess) There is only one parity-disk in the lower 2 levels. Good enough for raid 5 but you are explaining raid 6.
I think the picture for raid 5 is misleading. Based on how I understand raid 5, in each row one disk should have a parity block which is calculated from the other two blocks in that row.
then what is the amount of storage can be used in RAID 5 when more than 3 drives used such as 8 x 1TB drives for RAID 5? also what is the tolerance in that case?
JaeHyeok Choe For any RAID5 configuration, you would lose the equivalent of one disk to parity - so in your example, you’d have 7 x 1TB drives (7TB) of storage - and it would only handle one drive failure. The downside to having more drives, though, is that you’re increasing the probability of multiple drive failures, so you’d be better to go for RAID6 as this would give you more fault tolerance.
Would be more help if you could explain parity and how it is used to recover (or rebuild, are they different?) Data. But great animations. Could you share behind the scenes?
I am now embracing the topic again and it turns out that raid 5 on 2tb disks gives only 60% chance of recovering data due to errors that are caused by sata disks. The chance that we will come across such a reconstruction is large and prevents data from being rebuilt.
RAID 6 always use 2 disks for parity - so a RAID of 4 disks will have 2 (disk capacities) for data and 2 (disk capacities) for parity. If you use 5 disks you will still use 2 (disk capacities) for parity and then have 3 (disk capacities) for data - using 12 disks for a RAID 6 will give you 10 (disk capacities) for data and you will have double-disk recovery and 10x read-speed performance - NICE !! In a RAID 5 with 12 disks you will have 10x read speed and 11 (disk capacities) for data but will only be able to recover from 1 disk failure at a time. In a RAID 5 with that many disks it is recomended to use, at least, one disk as spare and setup for unattended start of recovery ;-)
sounds to me like RAID 5 with a Hot Spare would be superior to RAID 6 - theoretically. Unfortunately, I have lost more RAID 5 arrays both personally and professionally than any other form of RAID. There is something about how data gets written to the disks in a RAID 5 environment that makes the disks fail prematurely. I don't know the technical reason for this but I have had other IT professionals verify this very thing. RAID 5 is VERY prone to failure.
So for a raid 6 configuration you would say its better for those running massive amounts of space say a few hundred tb? Can you mix and match hdd sizee with raid6 say running 75tb drives and a 8th 10tb one in case of a dual failure? How would you setup something like this? Thank you in advance.
Not only the Raid explaination is on point but the powerpoint animation is next level.
I wish you could teach a hands on class of all your knowledge. Thank you for sharing/helping computer guys all around the net(world)
Thank you
oh yeah that would be just great.
i read all kinds of webpages trying to learn about parity......and he explained it in like five seconds
Nobody does it better! He was awesome before but with the new funny animations and word balloons it's just epic now. Fun and insightful. Smiles.
NaughtyAmerica
Best Animation on Networking , Good information & Good Explanation
Thank you.
It took literally 10 years to find the Best explanation of RAID online. Brilliantly and Concisely explained. Thank you very much!
Then you must be impressively bad at finding information.
@@miljororforsprakpartiet290 Or the statement is always true. If a better video is made today, he could truthfully say, "It took literally 11 years to find the best explanation of RAID online..". The statement can always be true, due to the qualifier, "best".
@@pvern78 Subjectively, but not objectively. A normal RAID article (i.e. basic understanding of the words "cloning" and "splitting"), at least for a normal IQ person, takes shorter to understand than the length of this video.
@@miljororforsprakpartiet290 yes. Again, the "best" modifier makes the statement subjective. It would be extremely hard, if not impossible, to objectively determine the "best" video on any specific topic.
@@pvern78 Video? Sir, he mentioned the whole fucking internet. If he has really scanned the whole of Internet, and hasn't found one single article as easy to understand, his opinion has no relevance anyway.
So glad I subscribed! Thank you so much for these high quality videos. They're all crystal clear to me. I watch them multiple times so I can get all the information! I thank you for your hard work!
Thanks :)
Yeah I've watched them multiple times too. People learn best when difficult concepts are broken down into easier visual explainations.
I am a visual learner and the animation really helps. Understood it in an instant, only that it took me 4 different videos for me to finally your video :(
Is there any other raid other than 0,1,5,6,10 ?
1:13 The RAID 5 animation have that bug that is show data block GHIJKL wit out Parity and will then be lose if a HDD crash.
and again at 2:43
Thanks for very cleared explaination about RAID 5, 6 . I also like your animation.
wow, imagine you are a teacher, your students would learn everything you ever have to offer in 1 day lol. love it and helped so much, THANK YOU kindly friend on the internet!
You are simply the best. You are the only one who makes videos that don't need to be played twice to be understood.
Would you be able to make a video about sub-netting and subnet masks? Your videos are amazing. Thanks for your hard work!
If you cannot explain a complicated matter simply, then you haven't understood it yourself yet either.
This.... this is simplifying something that has baffled me for the longest of times with such ease that it's nothing short of amazing.
Great job.
Sure, there are other people that explain things with much, much more technical detail, but I generally don't walk out of those feeling like I actually understood anything.
You sir make the best animated videos and your explanations are also best. You help me out a lot! Thank you! Hope to see even more uploads from you!
Genial.. Awersome!! Thanks for a great explain.. you help me to understanding more cleary! Thanks again..
Such a cool channel
Excellent Information & Explanation, I'm learning new things from you. Thank you
nice video - Our typical server setup has 8 drives. We put the OS on drives 0&1 with Raid 1, then the database data on drives 2,3,4,5 and 6 with Raid 6, and use drive 7 as a global hot spare. Not the best for performance, but we sleep well knowing we have minimal chance for data loss. I've also considered using drives 2,3,4&5 with Raid 5 with disks 6&7 performing global hot spare service (or disk 6 being dedicated hot spare to the first container, and disk 7 being dedicated hot spare for the second container), to get a little better write performance, but our environment trickles data to the RAID slowly, (control system data), and then engineers will pull massive amounts of data over time, so we like the compromise we've implemented.
As usual, very easy to understand explanation and video. Keep up the good work man!
But can i ask how the parity work to restore full capacity of 1 harddrive out of 3 if we dont know which one gonna be broke
Incredible content. Currently studying for my Security + 601 Exam and the animation showing the difference between each RAID helped a bunch. Thank you so much!
PowerCert, if you could give further explanation on how parity works, as well as how does data restoration occurs from it, I think it would be appreciated by the community
why does no ever explain how the "parity" block stores data to rebuild failed drives?
every video glosses over it like its common knowledge. call me an idiot because I missed that lesson sadly
It's a 1 or a 0 if the sum of the "row" is even or odd.
*Angry comment*
Me and the bois nerded out about parity. u wrong lmao.
Excellent explanation.
Keep recording these type of amazing animated explanations on a variety of topics.
Hats off.
From Pakistan.
You make everything easier to understand! I'm glad that I found your channel ♥
Good explanation, nice video⭐
Keep going!!!☺
Great explication, thank you!
It's chef Jean-Pierre. Didn't know you where interested in networking and system administration.
Your informations are too good for technology beginners . I can understand your effords on your videos ...Your lessons are very much pretty to understand those subjects .. I wish you should have more viewers on your channel. Please keep up your effords for us ..
Thanks for your videos.
some people have the talent to open your mind easily and stuff the information in it.
Very informative and concise. Sounds like RAID 5 is probably the way to go since a 2 disk failure is unlikely, faster write speeds, less required resources .
Ben Jake Yep. But bear in mind that the probability of multiple drive failures increases as you increase the number of drives (purely on the cumulative effects of probability, not because it affects reliability of drives). RAID6 is really more about higher availability.
Raid 6 sounds great if you got more money than problems.
You're missing one VERY important difference between RAID5 and RAID6:
If a disk fails in RAID5, you can only read from the remaing disks, until the broken disk is replaced - you cannot write to the disk, greatly reducing the usability of the remaining disks, untal a replacement disk is insteted and rebuild.
In RAID6 you can still write to the remaining disks, if a disk fails, meaning, you can still use the system while waiting for a new disk to be obtained, insterted and rebuild.
I m requesting you to upload prectical video on RAID 6 ... because in disk manager only written raid 5 ...
TLDR: RAID 5 handles 1 disk failure while RAID 6 handles 2 disk failures
Poor sap, he took the advice of not smashing with hammers and zapping with lasers and still lost some drives. So unlucky
I absolutely LOVE your powerpoint animation skills
you are the fucking master without you I would have failed fran's exam thanks mastodon I love you ❤❤❤
You deserve millions of likes
so, looks like Raid 6 and 10 are the same as capacity still lost half. But Raid 10 good for Higher server like company. for home use like me, I needed backup data of family pictures and video. should I choose Raid 5 or 6 ? If one of the hard drive fail I still can recover the data. Budget is low. If I go with Raid 5. and the storage space have 5, can I later put in 2 more? or this would not work with raid 5 ? Thanks
Now, If I setup raid 6, use 4 hard drive. 5th space is a waste right? so just buy 4 rack/case only? how about I saw some guy on youtube turn his old mid case into a Raid storage? I have an old desktop that ran on window xp or so. Can I use the mother board and run it Raid 6? or The Raid motherboard is different? I understand that from my labtop can not connect to the 2nd pc to access data. is there a video or instruction about this? Thanks a lot guys...
RAID10 and RAID6 requires 4 hdds and RAID10 is more advantage than RAID6. Is there any reason to use RAID6 in case having 4 hdds? Thanks
Currently studying for the A+ (1001) It took a while to fully wrap my head around RAID. But today I found your explanation and it cleared up a lot! You have a real gift. There’s a good balance of explaining concisely while visually showing how these processes work. Thank you so much for making these available for us!
Have you seen 2 way mirroring, 3 way mirroring?
Studying for mine right now. What resources did you use to study??
RAID 6 exists not for two drives failing under normal situations but in the situation of a single drive dialing and then the rebuilding process stressing the remaining drives pushing another drive over the edge during the long rebuild times modern high capacity drives require.
Keep in mind that when you create a RAID volume, you’re using drives of similar vintage. When one drive fails it usually means the others are not far behind. Expect more drive failures. Usually when a drive fails after several years of use it’s a good time to migrate all the storage to a newer, faster, higher capacity RAID. THe double redundancy helps assure the migration can complete before more drives die.
Love it. I do not have to spend more time to read a boring textbook to understand computer!
Here is my question. In raid 5 if you lose a disk How do you know which drive is bad If you are on a Desktop system that has Raid on it? Because all drives are the same size and all look the same.
You deserve a double thumbs up for this video too bad youTube doesn't allow it.
I totally understand what you’ve said. THANK YOU :’)
Your Videos are awesome, ur made for this
thanks, excellent vid and explenaition.
You forgot to explain how parity re-writes the broken disk. Since parity is written only at a 1:3 ratio the only way to recover the data is using a mathematical algorithm to extrapolate the missing data. Since this does not mirror data like in a RAID 1, its pretty clever that data bits can spit out more data than it actually physically stored on the party disk. Super crazy!
I see now why most people opt for RAID 10 instead of 6 even though you have a higher likelihood of losing data. Since even though both RAID 10 and 6 can do UP to 2 failures (say if a disk goes and rebuilding it taking place and during that time another disk goes too). The caveat of RAID 10 is that it's only takes one PER "sub" disk set (since RAID 10 is REALLY RAID 1 arrays stripped across with RAID 0). So unless your data is literally mission critical RAID 6 is indeed garbage.
Im having a question like this "A customer has requested a four-drive NAS device. The system needs to be capable of full system reconstruction in the event of two failed drives. Which of the following should be configured to meet this requirement?"
Options are RAID: 0, 1, 5, 10 and according to the answer is RAID 5. I was thinking RAID 10. RAID 6 is not even an option
Sir i want to know why RAM is faster than ROM?
Will you please tell me ,its very important for me .
So to compare to RAID4: RAID5 is similar to RAID4 but RAID4 had dedicated disk for parity and data was on N-1 disks so the parity disk was a bottleneck because every write to any data disk involved corresponding write to parity disk.
Never actually used raid six before It's interesting configuration.
So with RAID 6, let’s say I have data divided between drives A & B, and parity on drives C & D… I get that I am recover if I lose both parity OR one parity and one data. But what happens if I lose both data… and just have two copies of parity. How can I rebuild? Or are the parities different… not both XORs of A and B?
What if i would have 10x 1TB drives and i want to be a possible 3 of the drives fail. So i would have 7TB to use, "what RAID is that called" then or is it even possible to do? And sorry, English isn't my 1 language.
The one thing that is missing from the video is expansion!!! If I have 8 drives how much is allocated to parity??? Great job otherwise!! Now I have to go find the answer......
A few questions
You said systems like Raid 5 can store a large amount of data.But how is raid 5 different than any other storage capacity? If you have a 1gb file, weather it's on 1 drive or spread amongst 3,isn't it the same size ?
2.) If there is disk parity and a drive fails, how does the other drives know to rebuild information they never had ? Am I understanding that correctly? So if a file is striped among 3 drives and drive 3 fails,how do 1 and 2 rebuild the file that was on 3 if they never had it?
Somehow this is recommended to me in 2024.... Seems to me the video was lacking an explanation about how the parity works. Leaving it as "magic" takes away from what you were trying to get across.
Just my $0.02
I used to work in I.T.. 20 years ago. Does RAID 4 still exist? It was same as RAID 5 but with the parity all on one disk, not striped across disks. So if you lost the parity disk, the other disks still had their complete data striped across the other disks. If you lost one of the data disks, then the parity would rebuild the lost data on a new blank drive.
But have you covered RAID SHADOW LEGENDS, the most ambitious mmorpg.. Ok i'll stop
Thanks for the great video! From what I gathered, RAID 6 appears to provide great fault tolerance because it can recover from 2 disks failing. Yet the video mentions that RAID 5 is the more prevalent than RAID 6. Is this because it is not very common for multiple disks to fail in practice, or simply because RAID 5 came out before RAID 6? Is write performance generally more valued over robust fault tolerance?
I think your question answers itself. It depends on system design and budgeting. Is fault tolerance more important for you application? Or you care more about writing your data faster to the database so it is highly consistent?
does raid 5 require same size? i have 2 x 300gb and 4 x 900gb is this ok for raid 5 configuration, for this configuration what would be the total size ? thanks
What an explanation video 💓! my favourite channel I swear
Not sure how I came across these short, clearly explained PowerCert videos. Sure would have like to have this when I was in the business. Most books, classroom learning far to complicated and boring.
Video 1.13, data d,f,i,l is on disk3. If that this fail what is happening with data. How we not lose that data? I understamd process of rebuilding using parity on new/replaced disk but what with data when this disk goes down? How we are able to still have it, i mean to read data immediatly even one disk failed
visual is way better to understand... at least for me, thank you
So raid 6 is literally raid 10 but with the desvantage of having to calculate, them store the 2 paritys instead of just storing 2 copys?
I'm understanding the basics of the concept of RAID 5, but how the parity works doesn't seem to be covered in any of these videos.
you completely missed the point about the one big main advantage why to rather chose raid 6 over raid 5: fault tolerance while rebuild
what you explained is correct - but you example is very misleading - as, as you said, it'S unlikely two drives fail at the same time the main advantage is that in a raid 6 while you rebuilding one failed drive another drive could go bad and you are still able to fully rebuild the array after replacing the second failed drive - this where raid 6 is the big player im comparison to raid 5 cause with a raid 5 array you have to gamble with the critical state while rebuild a failed drive - this should be re-done to focus more on that very specific difference
The animation is wrong from 2:47 on. (I guess) There is only one parity-disk in the lower 2 levels. Good enough for raid 5 but you are explaining raid 6.
I think the picture for raid 5 is misleading. Based on how I understand raid 5, in each row one disk should have a parity block which is calculated from the other two blocks in that row.
At home i use RAID M. Yes you heard it right.. M.. stands for manual. Minimum of 2 disk. You know what it means.
Thx for your useful information video about R5 vs R6, Do you have any video for R50 OR D60. thx in advance.
then what is the amount of storage can be used in RAID 5 when more than 3 drives used such as 8 x 1TB drives for RAID 5? also what is the tolerance in that case?
JaeHyeok Choe For any RAID5 configuration, you would lose the equivalent of one disk to parity - so in your example, you’d have 7 x 1TB drives (7TB) of storage - and it would only handle one drive failure. The downside to having more drives, though, is that you’re increasing the probability of multiple drive failures, so you’d be better to go for RAID6 as this would give you more fault tolerance.
Then whats the difference between RAID 6 and RAID 10
Would be more help if you could explain parity and how it is used to recover (or rebuild, are they different?) Data. But great animations. Could you share behind the scenes?
Thank you very much dude. Your videos are great!
That bouncing is not good for the drives..
Agreed.
Thanks for giving wonderful videos, pls upload a video about 'BACKUP TYPES'. Thank you
thanks for creating the video of 'BACKUP TYPES'.
Heard that once the raid 5 tries to rebuild the damaged disk and encounter URE +unrecoverable read error,) then all 3 hdd will be damaged
How can i thank u dude.... what will i do is not enough... TNX! and there is sub in my language !!
its actually not Data A-B-Parity
much more like:
A1-A2-AP
BP-B1-B2
C1-CP-C2
Hi your raid video is very clear and easy to understand. Are you able to come up with a video to explain how parity recover data?
I feel like your parity on disks in RAID 6 are wrong it should be 2 parity for each layer.
I am now embracing the topic again and it turns out that raid 5 on 2tb disks gives only 60% chance of recovering data due to errors that are caused by sata disks. The chance that we will come across such a reconstruction is large and prevents data from being rebuilt.
It comes down to this that RAID 6 is nearly the same as a double Raid 1.
Wow. with this channel I really found a hidden gem in the education branch of the internet
Hi Sir, let say if the two hard drives that store A and B are damaged, how can the parity recover the drives?
So If I set this up in windows or any other OS will it show up as a single drive or will it show as multiple drives?
Thanks you really helpful, and the animation it's just perfect thanks
You explained it incredibly well, I finally understand it fully and can memorize it well thanks to your video!
Came here from chris titus’s misinformed video to seek real info
how likely is a "bad sector" to reck a rebuild in raid5?
RAID 6 always use 2 disks for parity - so a RAID of 4 disks will have 2 (disk capacities) for data and 2 (disk capacities) for parity. If you use 5 disks you will still use 2 (disk capacities) for parity and then have 3 (disk capacities) for data - using 12 disks for a RAID 6 will give you 10 (disk capacities) for data and you will have double-disk recovery and 10x read-speed performance - NICE !!
In a RAID 5 with 12 disks you will have 10x read speed and 11 (disk capacities) for data but will only be able to recover from 1 disk failure at a time. In a RAID 5 with that many disks it is recomended to use, at least, one disk as spare and setup for unattended start of recovery ;-)
sounds to me like RAID 5 with a Hot Spare would be superior to RAID 6 - theoretically. Unfortunately, I have lost more RAID 5 arrays both personally and professionally than any other form of RAID. There is something about how data gets written to the disks in a RAID 5 environment that makes the disks fail prematurely. I don't know the technical reason for this but I have had other IT professionals verify this very thing. RAID 5 is VERY prone to failure.
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So for a raid 6 configuration you would say its better for those running massive amounts of space say a few hundred tb? Can you mix and match hdd sizee with raid6 say running 75tb drives and a 8th 10tb one in case of a dual failure? How would you setup something like this? Thank you in advance.
You Are Great at Teaching. I learned and understand lots from you. Thanks a Lot.
Thanks.