Raid 1+0 vs Raid 0+1?

Question

So i've recently purchased 4x750gb hdd's and set them up in a raid 0+1 configuration (according to my raid bios) doing some research into raid 0+1 and 1+0 the general idea is that raid 1+0 provides greater redundancy at similar perfomance loss, i don't understand how they are any different besides the level they're nested at in my mind they effectively should both be able to tolerate a minimum of 1 and maximum of 2 drive failures at slightly less than striped raids performance (assuming the striped raid is running 2 drives not 4) so in short whats the difference between raid 0+1 and raid 1+0 and if raid 1+0 is better then why is it better?

stu_the_kilted_scot · Accepted Answer

they are exactly the same, the only possible difference is the order peoples fingers typed it.

One is striping across 2 (or more) discs
the other is mirroring the entire array to a matching set of discs.

so 1+0 and 0+1 mean exactly the same

same as a cheese and ham sandwich is not really different from a ham and cheese one

Fox · Answer

RAID 0 is when you have 2 hard drives that split the information equally. That will enhance performace as the computer can pull info from 2 hard drives faster than it can from one. Technically that doubles your drive capacity, so if you have 2 hard drives that are 100Gb each, you would have 200Gb total since the information is split in half between both the drives within RAID 0. RAID 1 is when 2 or more hard drives are mirrored. Meaning all hard drives have the exact same info on them which is good in case of a hard drive crash, you don't lose your info. However, if all the drives within RAID 1 are lets say 100Gb, then that's all you will have available, not 200Gb. If a drive crashes in RAID 0, you lose all your info unless you can rebuild the RAID setup. I would prefer RAID 0 for my Windows installation so everything runs faster and RAID 1 for storage so in case a drive crashes within RAID 1, I don't lose any of my stored info. If my RAID 0 crashes, all I have to do is reinstall Windows and my programs.

Anonymous · Answer

Pretty much what Stu said.  One is where the system is constantly mirroring one drive onto another.  So if your drive went bad, you can tell it to use the "backup" until you get a replacement.  If I remember correctly, some backup raid systems will automatically know when the drive is bad & automatically switch to the other drive.  When it detects a new drive, it will automatically copy the files over from the backup.  NOT all raid systems are automatic though

The other raid is spanning over multiple discs to make it appear you have one big drive.  My understanding the system is faster because it writes the part of each file onto each of the drives.  The bad part is, if one of the drives goes out, then you pretty much lose everything.

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Raid 1+0 vs Raid 0+1?

3 Answers