Re: [linux-lvm] LVM cachepool inconsistency after power event

[Krzysztof Chojnowski <frirajder@gmail.com>]

On Fri, Oct 8, 2021 at 9:57 AM Ming Hung Tsai <mtsai@redhat.com> wrote:
>
> You could simply detach the cache:
> sudo lvconvert vg0/tpg1-wdata --splitcache

Unfortunately this one didn't work:
$ sudo lvconvert vg0/tpg1-wdata --splitcache
Check of pool vg0/wdata_cachepool_cpool failed (status:1). Manual
repair required!
Failed to activate vg0/tpg1-wdata to flush cache.

> Or alternatively, reinitialize the cache by swapping the metadata with
> a blank one, which bypasses cache_check examination and then steps to
> metadata formatting:
> sudo lvcreate vg0 --size 40m --name cmeta_bak
> sudo lvconvert vg0/wdata_cachepool_cpool --swapmetadata --poolmetadata cmeta_bak

Thanks a lot! This one did work and I was able to activate the volume.
I tried doing something like this earlier but I used wrong syntax (I
missed the --swapmetadata flag).

> BTW, could you help provide the reproducing steps? I guess that you
> performed a power cut soon after creating the cache. Thanks.

Unfortunately, I don't have clear reproducing steps. As you've guessed
correctly - the power event has happened shortly (the same day) after
I created the cached volume. IIRC the volume hasn't even been used at
all so the cache would be empty. If I manage to reproduce it I will
report back here.

Thanks for all your help!
Krzysztof Chojnowski

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