Using RAID-0 stripes for use with a RAID-1

dyoung02 · Post by **dyoung02** » 2007/04/27 13:36:10

I am in the process of setting up what is supposed to be a RAID-1, but it will contain several sub RAID-0s. The basic idea is to have a mirror in place, but to also stripe specific partitions of my disk. I was told that this is not a good idea b/c if one partition goes down then I will not be able to boot my system. Does anyone know 1) if this is true, 2) is there a benefit to doing this using metadevices, or 3) should I just go ahead and set this up as a RAID-1 and call it a day?

I should probably add that this is a SW RAID setup.

Thx in advanced for any input or feedback.

gerald_clark · Post by **gerald_clark** » 2007/04/27 13:46:45

Although you can't boot off a software raid device, you can boot off of a partition
that is part of a raid1 device.
You need to load grub on both drives so that if hda fails, it can be physically swapped
with its raid1 partner.

freddy · Post by **freddy** » 2007/04/27 19:59:48

Thats what we call a Raid 10 :)

http://en.wikipedia.org/wiki/Nested_RAID_levels

dyoung02 · Post by **dyoung02** » 2007/04/27 20:50:36

^ LOL. I still don't quite understand the concept, but I was able to set it up. It's a meta RAID-1 set up with a sub meta RAID-0. But thanks for the feedback!

I got the boot problem taken care of as well. I had to create the nvalias backup_root a which will allow me to boot from either disk should one fail.

CentOS