[CentOS] RAID Hot Spare

[nate]

Dean Maluski wrote:
> I've googled this question without a great deal of information.

> Of couse will be creating RAID0 swap but leaving that out of the
> question for obvious reasons.

You really should use anything but RAID 0 for swap. If you need
to swap and that device is dead then your system is hosed.

At one point I read that you can get RAID0-"like" performance
by having multiple swap partitions on multiple devices and mounting
them with the same priority(mount option pri=(some number)). It
(was/is) supposed to stripe the swap partitions. Not sure if that
ever worked, though I have configured systems over the years to
use matching swap priorities, never really looked to see if it
was doing what I expected though.

Yeah, from swapon(2):
[..]
If two or more areas have the same priority, and it is the
high-est priority available, pages are allocated on a
round-robin basis between them.

nate