On 2019-01-09, Gordon Messmer <gordon.messmer@xxxxxxxxx> wrote:
> On 1/9/19 2:30 AM, Gary Stainburn wrote:
>
>> 2) is putting SWAP in a RAID a good idea? Will it help, will it cause
>> problems?
>
> The only "drawback" that I'm aware of is that RAID consistency checks
> become meaningless, because it's common for swap writes to be canceled
> before complete, in which case one disk will have the page written but
> the other won't. This is by design, and considered the optimal
> operation. However, consistency checks don't exclude blocks used for
> swap, and they'll typically show mismatched blocks.
If the swap is RAID1 on its own partitions (e.g., sda5/sdb5), then
CHECK_DEVS in /etc/sysconfig/raid-check can be configured to check
only specific devices.
--keith
--
kkeller@xxxxxxxxxxxxxxxxxxxxxxxxxx
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