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* Re: [linux-lvm] Question on RAID integrity limitations
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@ 2023-06-05 15:33   ` David Teigland
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From: David Teigland @ 2023-06-05 15:33 UTC (permalink / raw)
  To: Cyclic Group Z_1, LVM general discussion and development

On Sat, Jun 03, 2023 at 12:30:01AM +0000, Cyclic Group Z_1 wrote:
> The lvmraid documentation says the following: "To work around some
> limitations, it is possible to remove integrity from the LV, make the
> change, then add integrity again. (Integrity metadata would need to
> initialized when added again.) ... The following are not yet permitted
> on RAID LVs with integrity: lvreduce, pvmove, snapshots, splitmirror,
> raid syncaction commands, raid rebuild." Does this mean that RAID
> rebuilds can only be done with integrity temporarily turned off?

It refers specifically to running the command "lvchange --rebuild".  I'm
not entirely sure how important that command is, but I'd be happy to hear
more about its usefulness.

> This seems risky given that rebuilds are often when RAID arrays undergo the
> most stress and are thus vulnerable to failures/errors (namely, for
> parity RAID). Additionally, is the suggested workaround for snapshots to
> temporarily turn off integrity when taking/using snapshots?  Thank you!

Snapshots were recently enabled:;a=commit;h=fd6e113bba5fed5ee41152cde33220294c24ce2b


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