[linux-lvm] Unexptected filesytem unmount with thin provision and autoextend disabled - lvmetad crashed?

Gionatan Danti g.danti at assyoma.it
Tue May 24 13:45:06 UTC 2016

Il 18-05-2016 15:47 Gionatan Danti ha scritto:
> One question: I did some test (on another machine), deliberately
> killing/stopping the lvmetad service/socket. When the pool was almost
> full, the following entry was logged in /var/log/messages
> WARNING: Failed to connect to lvmetad. Falling back to internal 
> scanning.
> So it appears than when lvmetad is gracefully stopped/not running,
> dmeventd correctly resort to device scanning. On the other hand, in
> the previous case, lvmetad was running but returned "Connection
> refused". Should/could dmeventd resort to device scanning in this case
> also?
> ...
> Very probable. So, after a LVM update, is best practice to restart the
> machine or at least the dmeventd/lvmetad services?
> One more, somewhat related thing: when thin pool goes full, is a good
> thing to remount an ext3/4 in readonly mode (error=remount-ro). But
> what to do with XFS which, AFAIK, does not support a similar
> readonly-on-error policy?
> It is my understanding that upstream XFS has some improvements to
> auto-shutdown in case of write errors. Did these improvements already
> tickle to production kernels (eg: RHEL6 and 7)?
> Thanks.

Sorry for the bump, I would really like to know your opinions on the 
above remarks.

Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti at assyoma.it - info at assyoma.it
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