RAID levels

[Ahmed ABDOU_1]

Technically, what is the difference between RAID 0/1 and RAID 1/0?

[Vincent Farrugia]

Hello,

RAID 10 (or RAID 1/0) distributes data evenly across a number of disks, and mirrors eack disk to another disk. Basically it's normal disk striping, plus the stripes are mirrored to other disks.

In RAID 0/1, mirroring is done block-wise, not disk-base. So each block is written twice, on two consecutive disks. Thus, this allows any number of disks, not necessarily an even number, like RAID 10.

See attached.

HTH,
Vince

[Leif Halvarsson_2]

Hi
I don't think there is any difference. Sometimes it is called Raid 10, Raid 1+0 and perhaps other variants too. Technically it means striping + mirroring, two sets of disks is striped for performance and mirrored for security.

[Leif Halvarsson_2]

Hi
Perhaps I am wrong but I can't find any official definitions for this. What I can find is that "Different implementation is possible" with Raid level 1+0. One example:
http://www.engin.umd.umich.edu/~yilu/ECE578/portella/raid/sld017.htm

But if this different implementations is called 1/0 0/1 or something other seems to be vendor specific.

[Mike Fisher_1 · Accepted solution]

Hi MAS

This will lead you to more than you'll ever want to know about RAID !

http://www.acnc.com/04_01_00.html

Regards Mike