The nerds and trolls come out in droves to criticize and nitpick. Eli, let me fire back for ya. First of all, look at the description dummies,..."Beginner". If you guys are as smart as you think you are, why are you watching "beginner" videos? For a "beginner", this is a very good video for learning what an array is. Also, this video is 6 years old. Some stuff has changed since then. And where's your instructional videos, smarty pants? Oh, you can dish it out, but you can't take it...because you're afraid of someone crapping on you, the way you just did. Keep cranking out the vids, Eli. Good stuff.
Up to 12 minutes is basically everything you need to know at a simplistic level about RAID 0, 1, 5 and how they are different from one another. Thanks for sharing Eli.
pretty interesting to see his intial videos. He is trying to move his hands present what he is trying to explain. Whereas, now his doesn't care and looks more calm. I love his videos specially the latest ones.
Thank you for great explanation. Well explained. I knew nothing about raid and now it is more clear to me. Give Eli thanks because he takes his time explaining to us who doesn't not know. For people who said its nothing new because you learned from someone else. Thanks again.
Eli, you are still the Shiznit! I came directly here because I have a son going for a server interview and he needs to really know this as well as networking basics and troubleshooting concepts. Thanks as always for awesome content !!!!
Eli you explain things in such an uncomplicated way I m enjoying learning and understanding it. Your helping me through my Microsoft Fundermentals exam.
first of all thank you very sir. all that you are bringing to us .i have been watching your videos.from last couple of months...and i am highly influenced, we get many new things to learn in great depth..we students need an instructor like you so thank you very much....
very good lecture....i keep on downloading all your videos to my hard drive..i have separately bought new hard drive 500gb only for downloading Eli lectures..
You are simply the best, I have seen most of your videos I learnt most out of it... You are the best teacher I have ever seen ..it takes a lot... :) Thanks for all your effort.
Raid 0 = Stupid, good idea, but to risky. Raid 1 = Awesome Idea, great to keep things running. Raid 5 = Safer, my preferred choice (with sacrifice of space) Raid 10 = Beatiful. :')
Eli is the best, i'm learning alot about IT work as a computer savvy person, this is entertaining. lol...thanks Eli!!!!!!! I have a knack at PCs and this helps me grow in knowledge of IT work!
Wow Eli thank you for that video it was really well done and presented in a simple manner that was easily understandable. I now know what my coworker / IT manager is talking about when he starts talking tech on RAID.
Correct me if I'm wrong, but when you give your explanation of RAID 10 (1+0) around 14:00 it doesn't sound right to me... RAID 5 uses striping + parity, RAID 10 is literally RAID 1+0, which uses striping and mirroring, no parity, and allows 2 disks to fail with the minimum of 4 disks (unless 2 drives on both sides of the mirror fail). What you present seems more like RAID 55 (5+5)
Hi Eli , Thank you so much I'm sure that you receive allot of thank yous but we can't help it , your the best I mean the best teaching when it come to explaining computer tecnology....
I'd like to point out a couple mistakes in the video (please correct me if I'm wrong): 1- What you describe as RAID 10 (or 1+0), that is "striping two mirrored drives", is actually 01 (or 0+1), that is "mirroring two striped drives"? 2- with RAID 5, if you have 3 drives with capacities 100, 250 and 750 GB (see around min 21:00), then you would have a total volume of 200 GB, not 300 GB, as one is for parity?
nice video..as a side note.. on tinkering with a raid, in an event of a failure, you want to make use of the logs.. this helps in identifying the failed disk, flash the drive to make double sure it is in tandem with the log..Next, if possible, backup the entire volume before attempting any hot swap..
Very Informative.Great video, Recently I've been learning a lot from ur videos. Very good Eli! U put alot of effort into these videos! Thank You Very Much. Finally, At the end of this video. the idol (The Lord Nataraja Swamy) is awesome.
Watching in 2021, it’s like holy shit. There’s such a thing as a 240 gigabyte hard drives? Wow, that’s really small! I got like 8 terabytes on one hard drive.
Very well explained Eli. I appreciate your efforts.
10 років тому+1
All you people thinking about RAID 0 being "unsafe" just because you don't get the redundancy: the amount of read-write cycles per drive decreases with every disk you have in the array, so if you have a large amount of small drives, RAID 0 may actually allow these drives to live the maximum possible life they can get (called MeanTimeBetweenFailures), plus you get the benefit of using those "first read - first write" speeds at all time.
Hello sir, Thanks for the nice tut.i have a question though. Regardless of which raid you use , on which of the harddrives will the Operating System be installed ? e.g. raid 0 : is disk striping, if one hard drive fails nothing will work. where do you chose to9 install the OS ?
Question - When using disks of different sizes - You are limited to the smallest HD. Could you partition the other, larger drives for use? Either for a larger array or just extra usable disk space? Thanks in advance. Great vid btw, subscribed!
Technically its Redundant Array of Inexpensive Disk, the "Independent" is a more recent reference to it but as were tested in College the correct name is "Inexpensive", but its good to know both.
in regards to size and allocations in a raid 5 is it possible to partition HDD to be used in a raid 5? eg a 500, 500 and a 1TB can the 1TB be partitioned to x2 500GB?
In raid 1 you say I get no better performance than with a single hdd. I understand this when the computer is writing to the discs. But when reading from the discs it should without a problem be able to read different bytes from each disc and that way double the speed of reading?
+KenkZulu Ideally you would want all the drives to be of the same type and size. If they are not the same size, then the size of your array will be based on the smallest hard drive. For example if you have five 1TB drives and one 500GB drive, then the usable storage on all of your drives will be 500GB per drive and your array would be 2.5 TB in size for RAID 5 and not the 4TB or 4.5TB that you would expect. On the other hand if you just use the five 1TB hard drives and leave the 500GB drive out of the equation, you array would be 4TB in size. Remember that for RAID 5 you loose the equivalent storage of one of your drives to redundancy. 5 x 1TB = 5TB - 1TB = 4TB of usable storage or n-1 If you use RAID 6 then the equation is n-2 where "n" is the number of hard drives and the "-2" is the number of those drives that are used for redundancy. In the example above, that would reduce the 4TB of storage to only 3TB and your data would be way safer with a little more of a performance hit. Regardless of what level of RAID you use use, YOU MUST BACK UP YOUR DATA.
Thank you. Working on making a san/raid out of the 4 pi that run the greenhouse. Need a controller to switch gpios to back up. And a stand by power source in case of greenhouse solar failure.
hey Eli, I need your help I have a dell PowerEdge 6850. I want to install server 2008 on it but wen it comes for the OS to detect the HDD it does not find any thing. were as if I install Linux it detects all the Drives. what can I do to install server 2008?
I have two hdd and already have data on it, if i was to raid 0 them at a later date will it let me or would i have to wipe the hdd clean and reinstall everything after i raid them
How do you know witch HD has field in a RAID so that you wont accidentally take out the working HD and mess-up the RAID? also can you put 2 RAID controllers in 1 computer so that when 1 fails the 2nd 1 automatically starts without crashing the system?
redundant array of independent disks, originally named redundant array of inexpensive disks Donald, L. (2003). MCSA/MCSE 2006 JumpStart Computer and Network Basics (2nd ed.). Glasgow: SYBEX.
Great vids all round..Many thanks, Recently I've been learning a lot about Actifio (Copy data management) a comparison with say EMC would be great if you have the time big chap!
32:50 "The more parts you put into a computer, the more things that can break..." That's kind of a silly argument against RAID, since it's exactly that issue that RAID addresses. *Without* RAID, one component fails, and everything is lost. *With* RAID, one of the components fails, nothing is lost. As for the RAID controller failing: First of all, this would not be an issue if you use software RAID, which is really not that big a deal (in fact, with today's CPUs, software RAID can actually be *faster* than hardware). Even if the OS goes down, you can easily ensure compatibility by using the same software on another system to recover your array. Second, almost every motherboard has a RAID controller built-in. Motherboard failure is already more likely than RAID card failure, so you're going to be getting a new one anyway. And if the chips are similar, you may even be able to carry over the same drives. Also, RAID is hardly an irrelevant technology in this day and age. It gives you redundancy and performance, as it was designed to, just as well as it did when it was first invented. The only thing high capacity hard drives give you is more physical space inside your computer case. And finally, it's not a question of RAID versus backup. RAID allows a system keep running seamlessly after a single failure, and backups allow you to recover (non-seamlessly, and with some of your more recent data still lost) from a full system failure. RAID can't do what backups do, and neither can backups do what RAID does. These are two different things.
I've got a question about the whole size vs volume thing. Lets say i have 32 SSDs linked up using a RAID 5 and i'm using 31 60GB SSDs and 1 480 GB SSD. Could i use the 480GB as the redundant drive and essentially have 480GB of usable physical memory? I mean, it makes sense, right? i'd have to write all the bits onto a larger SSD in order to have all the bits in the event one drive goes bad. 31x60=1860. Really, i'd need one 1860GB SSD in order to completely use all the memory, or am i misunderstanding something?
Hi Eli, regarding RAID 10: I am a little bit confused, you said you can lose all drive from one side and the system is able to go on. In your example you have described 6 disk in RAID 10 and you said you can lose 3 disk from left side array and everything it's fine. Is that correct? I am asking you because as far as I know if you lose a total side of the array (in your example left side) you lose all array.
How does performance differ between RAID0 and options that offer redundancy? I have 2x500GB SSD in RAID0 and I recently started running my own business so I need fault protection. Thinking about buying 2 more and going RAID10, but I don’t want performance to suffer. Thanks.
if you create a raid 1 array with the utility available on ubuntu (mdadm) I was told by numerous people that both data and OS are mirrored --- I mean if it's not, what good is it?
Mirroring sounds great. But once you pull out that failed drive, put in the new drive, and it is rebuilding, it seems like all your eggs are now in one basket until the new drive is fully built up to again mirror the drive that's been working the whole time.
The nerds and trolls come out in droves to criticize and nitpick. Eli, let me fire back for ya. First of all, look at the description dummies,..."Beginner". If you guys are as smart as you think you are, why are you watching "beginner" videos? For a "beginner", this is a very good video for learning what an array is. Also, this video is 6 years old. Some stuff has changed since then. And where's your instructional videos, smarty pants? Oh, you can dish it out, but you can't take it...because you're afraid of someone crapping on you, the way you just did.
Keep cranking out the vids, Eli. Good stuff.
I have being doing quite a bit of research on tutorial videos, and trust me NO ONE explains things better than Eli. You are a legend!!!!
Up to 12 minutes is basically everything you need to know at a simplistic level about RAID 0, 1, 5 and how they are different from one another. Thanks for sharing Eli.
The Teacher, The Mentor, The Master, The Professional. Eli the Computer Guy! Thank you!
Eli, These videos are seriously getting me through my Cert IV. Thank you for being so clear!
No one can convey this to me , in such easy way, its only you. You are awesomme!!!
pretty interesting to see his intial videos. He is trying to move his hands present what he is trying to explain. Whereas, now his doesn't care and looks more calm. I love his videos specially the latest ones.
Thank you for great explanation. Well explained. I knew nothing about raid and now it is more clear to me. Give Eli thanks because he takes his time explaining to us who doesn't not know.
For people who said its nothing new because you learned from someone else. Thanks again.
Eli, you are still the Shiznit! I came directly here because I have a son going for a server interview and he needs to really know this as well as networking basics and troubleshooting concepts. Thanks as always for awesome content !!!!
Eli you explain things in such an uncomplicated way I m enjoying learning and understanding it. Your helping me through my Microsoft Fundermentals exam.
Mind blown by the 2 TB. What a time! Great video, Eli!
first of all thank you very sir. all that you are bringing to us .i have been watching your videos.from last couple of months...and i am highly influenced, we get many new things to learn in great depth..we students need an instructor like you so thank you very much....
very good lecture....i keep on downloading all your videos to my hard drive..i have separately bought new hard drive 500gb only for downloading Eli lectures..
Excellent video, clear explanation. It's nice to see Nataraj idol behind you.
Thanks Eli. Very good intro to RAID. Appreciate you taking the time to do this for all of us!
You are simply the best, I have seen most of your videos I learnt most out of it... You are the best teacher I have ever seen ..it takes a lot... :) Thanks for all your effort.
Raid 0 = Stupid, good idea, but to risky.
Raid 1 = Awesome Idea, great to keep things running.
Raid 5 = Safer, my preferred choice (with sacrifice of space)
Raid 10 = Beatiful. :')
Love the videos, i'm taking ENE with no actual IT background (nose bleed) and your videos really helps me understand the basics. Thanks! keep it up..
Eli is the best, i'm learning alot about IT work
as a computer savvy person, this is entertaining. lol...thanks Eli!!!!!!!
I have a knack at PCs and this helps me grow in knowledge of IT work!
you are one of the best teacher in my whole life
.....Now i know ....Eli u re such a goooooood tutor....lov your video classes....thankx dude.
Hi Eli.. Thank you so much for this knowledge sharing.. What you give comes back.. God bless..
Wow Eli thank you for that video it was really well done and presented in a simple manner that was easily understandable. I now know what my coworker / IT manager is talking about when he starts talking tech on RAID.
It was never clear until you explained. I would like to say thank you very much and keep going !! God Bless you mate :)
Correct me if I'm wrong, but when you give your explanation of RAID 10 (1+0) around 14:00 it doesn't sound right to me... RAID 5 uses striping + parity, RAID 10 is literally RAID 1+0, which uses striping and mirroring, no parity, and allows 2 disks to fail with the minimum of 4 disks (unless 2 drives on both sides of the mirror fail). What you present seems more like RAID 55 (5+5)
Still priceless knowledge in 2020. Eli, THANK YOU!
Hi Eli , Thank you so much I'm sure that you receive allot of thank yous but we can't help it , your the best I mean the best teaching when it come to explaining computer tecnology....
Best RAID5 explanation I've seen
Great video, I knew the basics of RAID but this taught me more than what I thought I knew. SO thank you very much for that!
Great teaching! Inspiring, easy-going and pragmatic. Even after 5y from its recording… Eυχαριστώ (thanks) Eli!
I'd like to point out a couple mistakes in the video (please correct me if I'm wrong):
1- What you describe as RAID 10 (or 1+0), that is "striping two mirrored drives", is actually 01 (or 0+1), that is "mirroring two striped drives"?
2- with RAID 5, if you have 3 drives with capacities 100, 250 and 750 GB (see around min 21:00), then you would have a total volume of 200 GB, not 300 GB, as one is for parity?
nice video..as a side note.. on tinkering with a raid, in an event of a failure, you want to make use of the logs.. this helps in identifying the failed disk, flash the drive to make double sure it is in tandem with the log..Next, if possible, backup the entire volume before attempting any hot swap..
Big thanks for Eli for making this video. Great job!
Any one can understand and Thank you Mr.Eli for explaining in detal........ Thanks
Even though it's old its a great video and very thorough. Thanks for the help.
Very Informative.Great video, Recently I've been learning a lot from ur videos. Very good Eli! U put alot of effort into these videos! Thank You Very Much.
Finally, At the end of this video. the idol (The Lord Nataraja Swamy) is awesome.
Loved the chair swivel at 32:25 , you should be called Don Eli after that beauty
Great video !!! understood very well the concept of RAID !!! Thanx a lot
Eli, you are the best... great job
Thanks Eli, I never understood this before! Nobody really explained it to me like you have.
very Informative. Great Video.
Eli. I appreciate You....You are toooo Good......I am becoming your Fan....
Awesome nice nice, always the best
Watching in 2018, when he said the max drive at the moment was 1TB, I realized we’ve come a very long way.
Watching in 2021, it’s like holy shit. There’s such a thing as a 240 gigabyte hard drives? Wow, that’s really small! I got like 8 terabytes on one hard drive.
Thanks ..Excellent & clear explanation ..
Nice job on explaining raid, size, and volume. I am going to apply them on my 8x HP DL360 5G serversfor hands on.
Very well explained Eli. I appreciate your efforts.
All you people thinking about RAID 0 being "unsafe" just because you don't get the redundancy: the amount of read-write cycles per drive decreases with every disk you have in the array, so if you have a large amount of small drives, RAID 0 may actually allow these drives to live the maximum possible life they can get (called MeanTimeBetweenFailures), plus you get the benefit of using those "first read - first write" speeds at all time.
Hello sir,
Thanks for the nice tut.i have a question though. Regardless of which raid you use , on which of the harddrives will the Operating System be installed ?
e.g. raid 0 : is disk striping, if one hard drive fails nothing will work.
where do you chose to9 install the OS ?
Was a bit confused about RAID, thanks for making it so clear.
Is that a pun i see
Hola, muy interesante video, la funcion de hot swaple solo funciona con el raid 5???
Any time i need computer help i go to my guy Eli!..thanks dude
wow...my textbook was way more complicated than this...now i got a clear picture thanks ELI
Excellent Explanation thank you............ Can we use C drive as RAID?
Question - When using disks of different sizes - You are limited to the smallest HD. Could you partition the other, larger drives for use? Either for a larger array or just extra usable disk space? Thanks in advance. Great vid btw, subscribed!
When using different sized hard drives can a second volume be created using the unused space of the larger drives?
Thanks for the video, Eli. Is it true to say that RAID 5 is a "hybrid" of RAID 1 and 0? (Even though RAID 10 is really RAID 1+0).
"one really big 1TB hard drive", hehe, funny hearing that in 2018
I just bought 16 terabytes for a home server for $600 CDN. Crazy stuff.
I always always confused about RAID 5 until now. Thanks!
Technically its Redundant Array of Inexpensive Disk, the "Independent" is a more recent reference to it but as were tested in College the correct name is "Inexpensive", but its good to know both.
Awesome dude, very logical.
On my study material it says RAID 5 is disk striping with parity spread among all disks. Whereas RAID 3 is disk striping with a single parity disk.
Thanks for the vid.. I have a question... Is fault tolerance the same as redundancy when it comes to RAID?
in regards to size and allocations in a raid 5 is it possible to partition HDD to be used in a raid 5? eg a 500, 500 and a 1TB can the 1TB be partitioned to x2 500GB?
Great video.
Great explaination!!!
you are good, consistent and clear Thank you, do you teach 7 layers networking?
Excellent Explanation thank you.
it really helpfulllll thumps up man
In raid 1 you say I get no better performance than with a single hdd. I understand this when the computer is writing to the discs. But when reading from the discs it should without a problem be able to read different bytes from each disc and that way double the speed of reading?
Dude. This lesson was a really super informative.👍
i like your videos, very good training.
Greets,
Always learn from ur
vids cheers
What happens when in a Raid 5 configuration, more then 1 HD goes. Can you replace 2 or 3 without losing anything?
Thank you sir.., nice video.. I have a query, if RAID 5 were at use, how size would be the RAM should be..
in regards to size vs volume, how would you figure the size when there are different sized disks in the array? can i get an example?
+KenkZulu
Ideally you would want all the drives to be of the same type and size. If they are not the same size, then the size of your array will be based on the smallest hard drive. For example if you have five 1TB drives and one 500GB drive, then the usable storage on all of your drives will be 500GB per drive and your array would be 2.5 TB in size for RAID 5 and not the 4TB or 4.5TB that you would expect.
On the other hand if you just use the five 1TB hard drives and leave the 500GB drive out of the equation, you array would be 4TB in size.
Remember that for RAID 5 you loose the equivalent storage of one of your drives to redundancy. 5 x 1TB = 5TB - 1TB = 4TB of usable storage or n-1
If you use RAID 6 then the equation is n-2 where "n" is the number of hard drives and the "-2" is the number of those drives that are used for redundancy. In the example above, that would reduce the 4TB of storage to only 3TB and your data would be way safer with a little more of a performance hit.
Regardless of what level of RAID you use use, YOU MUST BACK UP YOUR DATA.
Simply awesome :)
Thank you. Working on making a san/raid out of the 4 pi that run the greenhouse. Need a controller to switch gpios to back up. And a stand by power source in case of greenhouse solar failure.
hey Eli, I need your help I have a dell PowerEdge 6850. I want to install server 2008 on it but wen it comes for the OS to detect the HDD it does not find any thing. were as if I install Linux it detects all the Drives.
what can I do to install server 2008?
I have two hdd and already have data on it, if i was to raid 0 them at a later date will it let me or would i have to wipe the hdd clean and reinstall everything after i raid them
How do you know witch HD has field in a RAID so that you wont accidentally take out the working HD and mess-up the RAID?
also can you put 2 RAID controllers in 1 computer so that when 1 fails the 2nd 1 automatically starts without crashing the system?
redundant array of independent disks, originally named redundant array of inexpensive disks
Donald, L. (2003). MCSA/MCSE 2006 JumpStart Computer and Network Basics (2nd ed.). Glasgow: SYBEX.
Great vids all round..Many thanks, Recently I've been learning a lot about Actifio (Copy data management) a comparison with say EMC would be great if you have the time big chap!
That turn at the end. Totally awesome :DDD
32:50 "The more parts you put into a computer, the more things that can break..."
That's kind of a silly argument against RAID, since it's exactly that issue that RAID addresses. *Without* RAID, one component fails, and everything is lost. *With* RAID, one of the components fails, nothing is lost.
As for the RAID controller failing:
First of all, this would not be an issue if you use software RAID, which is really not that big a deal (in fact, with today's CPUs, software RAID can actually be *faster* than hardware). Even if the OS goes down, you can easily ensure compatibility by using the same software on another system to recover your array.
Second, almost every motherboard has a RAID controller built-in. Motherboard failure is already more likely than RAID card failure, so you're going to be getting a new one anyway. And if the chips are similar, you may even be able to carry over the same drives.
Also, RAID is hardly an irrelevant technology in this day and age. It gives you redundancy and performance, as it was designed to, just as well as it did when it was first invented. The only thing high capacity hard drives give you is more physical space inside your computer case.
And finally, it's not a question of RAID versus backup. RAID allows a system keep running seamlessly after a single failure, and backups allow you to recover (non-seamlessly, and with some of your more recent data still lost) from a full system failure. RAID can't do what backups do, and neither can backups do what RAID does. These are two different things.
I wish you was my instructor :)
Can I have different disk space on RAID 5?
thx eli for explaining in such detail!!!!by the way i also liked LORD SHIVA in brass behind u!!!!
eli, you are such a teacher!
in raid 6 and raid 5, what will happen if the redundancy disk fails?
I've got a question about the whole size vs volume thing. Lets say i have 32 SSDs linked up using a RAID 5 and i'm using 31 60GB SSDs and 1 480 GB SSD. Could i use the 480GB as the redundant drive and essentially have 480GB of usable physical memory? I mean, it makes sense, right? i'd have to write all the bits onto a larger SSD in order to have all the bits in the event one drive goes bad. 31x60=1860. Really, i'd need one 1860GB SSD in order to completely use all the memory, or am i misunderstanding something?
Pretty good man! I'm sure alot of effort went into the vid! Congrats!
Your explanation is the best. thanks
Hi Eli, regarding RAID 10: I am a little bit confused, you said you can lose all drive from one side and the system is able to go on. In your example you have described 6 disk in RAID 10 and you said you can lose 3 disk from left side array and everything it's fine. Is that correct? I am asking you because as far as I know if you lose a total side of the array (in your example left side) you lose all array.
you're a legend Eli
How does performance differ between RAID0 and options that offer redundancy? I have 2x500GB SSD in RAID0 and I recently started running my own business so I need fault protection. Thinking about buying 2 more and going RAID10, but I don’t want performance to suffer. Thanks.
if you create a raid 1 array with the utility available on ubuntu (mdadm) I was told by numerous people that both data and OS are mirrored --- I mean if it's not, what good is it?
Mirroring sounds great. But once you pull out that failed drive, put in the new drive, and it is rebuilding, it seems like all your eggs are now in one basket until the new drive is fully built up to again mirror the drive that's been working the whole time.
Nice Video it helps me a lot
Thanks for sharing the knowledge.