On Sunday 21 January 2007 19:25, Pascal Bleser wrote:
> S Glasoe wrote:
> ...
>
> > One nit to pick also. Why put /swap on the RAID array? I'd advocate
> > having two separate non-RAID /swap files on the bare metal. But then,
> > that's just me. /swap is slow enough compared to main memory but then
> > you also want to write that transient data again to another drive and
> > slow the rest of the system down, again? Sure modern systems are fast
> > but I look at it as unneeded wear and tear.
>
> Well... on a side note and it doesn't help the OP but... it does make
> sense to put swap on RAID.
>
> Say a disk dies. Yay, keeps on running because you have the 2nd disk in
> the array (let's suppose RAID1).
> But if you have something in swap your system will crash when it loads
> the swapped-out pages into memory again, because the swap isn't on RAID
> (supposing the "dead disk" is also full of bad blocks).
>
> Having swap on RAID means that the system actually keeps on running when
> a disk dies as the swapped out pages will be read from the clean disk in
> the degraded array.
>
> cheers
> Pascal Bleser

Excellent point. Thanks,
Stan
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