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.
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 explain things in such an uncomplicated way I m enjoying learning and understanding it. Your helping me through my Microsoft Fundermentals exam.
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 !!!!
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....
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.
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!
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. :')
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..
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....
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..
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.
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.
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.
I just bought 16 terabytes for a home server for $600 CDN. Crazy stuff.
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.
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.
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.
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!
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 ?
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?
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.
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?
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.
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.
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?
+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.
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?
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.
What about RAID controllers built into a motherboard. I am buidling a couple of servers with the following configuration Motherboard RAID 1 Primary mirror drive 1 / primary mirror drive 2 / boot drive Server 2012 RAID 1 storage mirror drive 1 / storage mirror drive 2 / data drive What are your thoughts on the motherboard RAID 1 option for a boot drive?
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 explanation and may be its not the right place to say this but I very surprised to see the Natarajar statue behind you which is Hindu God as well as its main temple is near to my home town Chidambaram,Tamil Nadu,India .
what can cause one of my storage HDD's to suddenly think it's one half of a raid zero after I raided my two SSD's then after everything booted up. I connected my other storage drives and one of them became half of a RAID. Yet I never Raided it in the first place.
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.
Eli, These videos are seriously getting me through my Cert IV. Thank you for being so clear!
The Teacher, The Mentor, The Master, The Professional. Eli the Computer Guy! Thank you!
No one can convey this to me , in such easy way, its only you. You are awesomme!!!
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 explain things in such an uncomplicated way I m enjoying learning and understanding it. Your helping me through my Microsoft Fundermentals exam.
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 !!!!
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....
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.
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!
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. :')
Mind blown by the 2 TB. What a time! Great video, Eli!
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..
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....
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..
Any one can understand and Thank you Mr.Eli for explaining in detal........ Thanks
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..
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.
you are one of the best teacher in my whole life
Excellent video, clear explanation. It's nice to see Nataraj idol behind you.
Still priceless knowledge in 2020. Eli, THANK YOU!
It was never clear until you explained. I would like to say thank you very much and keep going !! God Bless you mate :)
Hi Eli.. Thank you so much for this knowledge sharing.. What you give comes back.. God bless..
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!
.....Now i know ....Eli u re such a goooooood tutor....lov your video classes....thankx dude.
Great teaching! Inspiring, easy-going and pragmatic. Even after 5y from its recording… Eυχαριστώ (thanks) Eli!
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.
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.
Nice job on explaining raid, size, and volume. I am going to apply them on my 8x HP DL360 5G serversfor hands on.
Big thanks for Eli for making this video. Great job!
wow...my textbook was way more complicated than this...now i got a clear picture thanks ELI
Even though it's old its a great video and very thorough. Thanks for the help.
Was a bit confused about RAID, thanks for making it so clear.
Is that a pun i see
Best RAID5 explanation I've seen
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.
"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.
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.
Loved the chair swivel at 32:25 , you should be called Don Eli after that beauty
Thanks Eli, I never understood this before! Nobody really explained it to me like you have.
Great video !!! understood very well the concept of RAID !!! Thanx a lot
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.
I always always confused about RAID 5 until now. Thanks!
Any time i need computer help i go to my guy Eli!..thanks dude
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.
Eli, you are the best... great job
Thanks ..Excellent & clear explanation ..
Eli. I appreciate You....You are toooo Good......I am becoming your Fan....
Very well explained Eli. I appreciate your efforts.
thx eli for explaining in such detail!!!!by the way i also liked LORD SHIVA in brass behind u!!!!
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!
Excellent Explanation thank you.
very Informative. Great Video.
I wish you was my instructor :)
Always learn from ur
vids cheers
Striping = bits, thanks for this I was totally confused.
Seeing that hard drives are not inexpensive, but VERY expensive shouldn't it be called RAED: Redundanct Array of Expensive Disks?
For that reason, the "I" in RAID was changed to "Independent" instead of "Inexpensive" later on.
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 ?
Excellent Explanation thank you............ Can we use C drive as RAID?
Awesome nice nice, always the best
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?
Awesome dude, very logical.
When using different sized hard drives can a second volume be created using the unused space of the larger drives?
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.
Great video.
i like your videos, very good training.
Greets,
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?
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.
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.
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?
Great explaination!!!
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.
eli, you are such a teacher!
you are good, consistent and clear Thank you, do you teach 7 layers networking?
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?
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.
Dude. This lesson was a really super informative.👍
What about RAID controllers built into a motherboard. I am buidling a couple of servers with the following configuration
Motherboard RAID 1 Primary mirror drive 1 / primary mirror drive 2 / boot drive
Server 2012 RAID 1 storage mirror drive 1 / storage mirror drive 2 / data drive
What are your thoughts on the motherboard RAID 1 option for a boot drive?
Your explanation is the best. thanks
I get enough about Raid. Thank u bro.
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?
Hola, muy interesante video, la funcion de hot swaple solo funciona con el raid 5???
only subscribed that I can do for appreciate your work
you're a legend Eli
Thank you sir.., nice video.. I have a query, if RAID 5 were at use, how size would be the RAM should be..
Nice explanation and may be its not the right place to say this but I very surprised to see the Natarajar statue behind you which is Hindu God as well as its main temple is near to my home town Chidambaram,Tamil Nadu,India .
Thanks for sharing the knowledge.
You have Nataraj statue at your back ..impressed
Ive heared it both ways, Independent or Inexpensive. Did a quick search and Wikipedia lists it as both
Man you are amazing.
Do it in a more professional and attractive way and you will get a lot more of followers.
Thanks for the vid.. I have a question... Is fault tolerance the same as redundancy when it comes to RAID?
Nice Video it helps me a lot
what can cause one of my storage HDD's to suddenly think it's one half of a raid zero after I raided my two SSD's then after everything booted up. I connected my other storage drives and one of them became half of a RAID. Yet I never Raided it in the first place.
Very well explain...Thx a lot
That turn at the end. Totally awesome :DDD
thanks man, all ur videos are gr8
it really helpfulllll thumps up man
Simply awesome :)