Re: [gentoo-user] Software RAID Advice Needed

[jarry@gmx.net]

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>> If a disk fails,
>> your system would likely crash (due to the swap device), but would
>> reboot in a degraded mode (no swap, slow performance, etc).
> 
> You could avoid that by not using RAID for swap. Instead, use four
> separate swap partitions, one on each drive. As long as they all have
> the same priority, the kernel will share swap duties between them
> equally.
 
If you make more swap partitions on more physical drives with the same
priority, it is the same as swap on raid0: system strips swap across
drives. And if some drive crashes and swap partition on that drive has
been used, very probably system crashes too. But then reboots at least
with remaining swap partitions...

> There's no real benefit to using RAID for swap, unless you are
> limited on RAM and use swap a lot, when RAID0 may help.

There is some benefit, if you use raid1 for swap. In such a case
even drive failure does not cause system crash, because swap space
is mirrored too. But raid1 slightly degrades swap performance...

Jarry

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