10 Jan
2019
10 Jan
'19
4:13 a.m.
On 2019-01-09, Gordon Messmer gordon.messmer@gmail.com wrote:
On 1/9/19 2:30 AM, Gary Stainburn wrote:
- 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@wombat.san-francisco.ca.us