This could be a problem because a failed swap disk could easily bring the
system down! We should be able to mirror swap!
On Thu, 25 Feb 1999, Benno Senoner wrote:
> Hi,
> I tested setting up a swapfile on an md device: ( 2.0.36+0145raid)
>
> I created an 8MB swapfile on the md device,
>
> dd if=/dev/zero of=/swapfile bs=1024 count=8192
> mkswap /swapfile 8192
>
> swapon /swapfile
>
> at this point the swapon process hangs and says:
>
> "Got md request, not good ..."
>
> even trying to kill -9 the swapon process does not works,
> the swapon program hangs ...
>
> I think the problem is the thing allan pointed out:
> when using a swapfile the kernel bypasses the filesystem and uses the
> blocks on the disk directly,
> which fails in the case of soft-RAID disks, because the blocks are
> spread across disks ....
>
>
> Some time ago I patched an old 2.0.12 kernel with the swap-over-NFS
> patch, for a diskless
> machine and it worked very well.
> I think swap over NFS must go through the filesystem of the NFS server,
> because the NFS server
> does not permit to use the disk blocks directly.
>
> Does anyone know if there is a similar pacht that allows to swap over a
> soft RAID5 disk ?
>
> Or is there a way to declare part of the RAM as swaparea ,
> maybe using /dev/loop ?
>
> this because linux without a swaparea , has big performance penalties
> when running out of RAM
> (due to executable pages trashing).
>
> thans for infos,
>
> regrads,
> Benno.
>
>
James ([EMAIL PROTECTED])
Vortex Internet
My operating system unders~1 long filena~1, and yours?
