Introduction to RAID
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- čas přidán 21. 07. 2024
- Info
Level: Beginner
Presenter: Eli the Computer Guy
Length of Class: 34 Minutes
Tracks
Security / Data Integrity
Prerequisites
None
Purpose of Class
This class introduces the student to R.A.I.D. technology (Redundant Array of Inexpensive Disks), it's applications and gives advice for using disk redundancy in the real world. - Věda a technologie
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!
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.
No one can convey this to me , in such easy way, its only you. You are awesomme!!!
The Teacher, The Mentor, The Master, The Professional. Eli the Computer Guy! Thank you!
Great teaching! Inspiring, easy-going and pragmatic. Even after 5y from its recording… Eυχαριστώ (thanks) Eli!
Mind blown by the 2 TB. What a time! Great video, Eli!
It was never clear until you explained. I would like to say thank you very much and keep going !! God Bless you mate :)
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....
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 !!!!
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!
Thanks Eli. Very good intro to RAID. Appreciate you taking the time to do this for all of us!
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!
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.
Any one can understand and Thank you Mr.Eli for explaining in detal........ Thanks
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....
very Informative. Great Video.
Big thanks for Eli for making this video. Great job!
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..
Great video !!! understood very well the concept of RAID !!! Thanx a lot
Still priceless knowledge in 2020. Eli, THANK YOU!
Excellent video, clear explanation. It's nice to see Nataraj idol behind you.
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.
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..
Even though it's old its a great video and very thorough. Thanks for the help.
Hi Eli.. Thank you so much for this knowledge sharing.. What you give comes back.. God bless..
you are one of the best teacher in my whole life
Thanks Eli, I never understood this before! Nobody really explained it to me like you have.
Nice job on explaining raid, size, and volume. I am going to apply them on my 8x HP DL360 5G serversfor hands on.
.....Now i know ....Eli u re such a goooooood tutor....lov your video classes....thankx dude.
Loved the chair swivel at 32:25 , you should be called Don Eli after that beauty
Eli, you are the best... great job
Best RAID5 explanation I've seen
Dude. This lesson was a really super informative.👍
Very well explained Eli. I appreciate your efforts.
Thanks ..Excellent & clear explanation ..
That turn at the end. Totally awesome :DDD
You're great explaining :) Thank u so much!!
Simply awesome :)
Awesome dude, very logical.
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!
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 explaination!!!
Was a bit confused about RAID, thanks for making it so clear.
Is that a pun i see
Great video.
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..
When using different sized hard drives can a second volume be created using the unused space of the larger drives?
Excellent Explanation thank you.
I always always confused about RAID 5 until now. Thanks!
Awesome nice nice, always the best
Great video, thank you.
Any time i need computer help i go to my guy Eli!..thanks dude
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?
Eli. I appreciate You....You are toooo Good......I am becoming your Fan....
Pretty good man! I'm sure alot of effort went into the vid! Congrats!
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 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?
Always learn from ur
vids cheers
in raid 6 and raid 5, what will happen if the redundancy disk fails?
thanks man, all ur videos are gr8
Thanks for sharing the knowledge.
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
What happens when in a Raid 5 configuration, more then 1 HD goes. Can you replace 2 or 3 without losing anything?
it really helpfulllll thumps up man
thx eli for explaining in such detail!!!!by the way i also liked LORD SHIVA in brass behind u!!!!
Thanks for the vid.. I have a question... Is fault tolerance the same as redundancy when it comes to RAID?
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.
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?
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.
Your explanation is the best. thanks
Very well explain...Thx a lot
Hola, muy interesante video, la funcion de hot swaple solo funciona con el raid 5???
Nice Video it helps me a lot
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?
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?
Greate video!
Oi Eli Mottai you rock .... keep it up :)
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!
Can I have different disk space on RAID 5?
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 ?
Thank you sir.., nice video.. I have a query, if RAID 5 were at use, how size would be the RAM should be..
wow...my textbook was way more complicated than this...now i got a clear picture thanks ELI
I get enough about Raid. Thank u bro.
you're a legend Eli
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)
How do you make the pc recognize the hard drives as raid 0 and raid 1. E.g. You want the 3 SSDs to be raid 0 and the 2 HDD to be raid 1
It doesn't recognize the array. When you pluck the new drives into your computer and boot it up, you can go into the BIOS settings or your raid controller's settings, and then manually create a RAID, ie. a logical drive. You then specify which drives you want to use (HDDs always have to be the same size for one array, ie. 1TB or 2TB) and what _type_ of array you wnat to create. For example, you say that those 4 harddrives with 2TB each are setup as a RAID 1. Then you say that the SSDs should be configured as RAID 0.
Your system then writes the RAID info (ie. what type of raid it is etc.) on the harddrives. The next time you boot up your PC, the raid controller will read that info and tell your OS that there are 2 logical drives -> one being the RAID 1 array out of the 4 harddrives, as well as another one being the RAID 0 we configured out of the 2 SSDs.
only subscribed that I can do for appreciate your work
what would happen if you were using a hardware raid 1 or 5 and the unit not the harddrives fail, can the raid be rebuilt by inserting the HDDs into another unit
+Shane S
Yes, provided that the other unit is using the same or similar controller card.
you are good, consistent and clear Thank you, do you teach 7 layers networking?
Striping = bits, thanks for this I was totally confused.
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.
I wish you was my instructor :)