I believe I read in the RAID HowTo that you shouldn't put swap memory on a
RAID; the swap daemon stripes it automatically over multiple partitions.
Don't know if it's anywhere near redundant though.
-Robin
>Hi,
>
>I heard that actually soft-raid for Linux can't swap over a /dev/md*
>device.
>
>Someone suggests that putting enough RAM into a box, can avoid swapping,
>
>but I think it is safe to have some swap space, in the case a process
>eats up much
>memory for short time, to prevent that pages of executable programs are
>trashed over and over ,
>which degrades performance seriously.
>I've seen this on my P133 with 64MB running X11 at 16bpp plus a Netscape
>4.07 with 20 open
>browser windows. (displaying large GIFs)
>If I disable swap space, then at some point the system slows down very
>much.
>If I leave the swaparea enabled, the system uses 5-10MB of the swaparea,
>
>and netscape feels much smooter, but there are very little swapping
>activity on the disk.
>
>I don't know how much slower it is to swap do a regular file instead
>using the raw partition,
>but I think for soft-raid setups, if one want to protect the swaparea
>with RAID,
>then the easiest way to do this, is to make a /swapfile ,with dd ,
>run mkswap and swapon,
>and adding a line in fstab.
>
>any comments / suggestions ?
>
>regards,
>Benno.
>
>
>
