Re: SWAP file on a RAID-10 array possible?

[Michael Tokarev <mjt@tls.msk.ru>]

Tomas France wrote:
> Thanks for the answer, David!
> 
> I kind of think RAID-10 is a very good choice for a swap file. For now I
> will need to setup the swap file on a simple RAID-1 array anyway, I just
> need to be prepared when it's time to add more disks and transform the
> whole thing into RAID-10... which will be big fun anyway, for sure ;)

By the way, you don't really need raid10 for swap.  Built-in linux
swap code can utilize multiple swap areas just fine - mkswap + swapon
on multiple devices/files.  This is essentially a raid0.  For raid10,
one thing needed is the mirroring, with is provided by raid1.  So
when you've two drives, use single partition on both to form a raid1
array for swap space.  If you've 4 drives, create 2 raid1 arrays and
specify them both as swap space, giving them appropriate priority
(prio=xxx in swap line in fstab).  With 6 drives, have 3 raid1 arrays
and so on...  This way, the whole thing is much simpler and more
manageable.

/mjt