Dne 13.11.2017 v 16:12 Alexander 'Leo' Bergolth napsal(a):
Hi!
On 11/13/2017 03:51 PM, Zdenek Kabelac wrote:
Dne 13.11.2017 v 14:41 Alexander 'Leo' Bergolth napsal(a):
I have a EL7 desktop box with two sata harddisks and two ssds in a
LVM raid1 - thin pool - cache configuration. (Just migrated to this
setup a few weeks ago.)
After some days, individual processes start to block in disk wait.
I don't know if the problem resides in the cache-, thin- or raid1-layer
but the underlying block-devices are fully responsive.
I have prepared some info at:
http://leo.kloburg.at/tmp/lvm-blocks/
Do the stack backtraces provide enough information to locate the source
of the blocks?
I'd be happy to provide additional info, if necessary.
Meanwhile I'll disable the LVM cache layer to eliminate this potential
candidate.
It would be probably nice to see the result of 'dmsetup status'
OK. Will be included next time.
I'd have guessed you are probably hitting 'frozen' raid state
which is unfortunate existing upstream bug.
Are you talking about RH bug 1388632?
https://bugzilla.redhat.com/show_bug.cgi?id=1388632
Unfortunately I can only view the google-cached version of the bugzilla
page, since the bug is restricted to internal view only.
that could be similar issue yes
But the google-cached version suggests that the bug is mainly hit when
removing the raid-backed cache pool under IO.
I my scenario, no modification (like cache removal) of the lvm setup was
done when the blocks occured.
Easiest is to check 'dmsetup status' - just to exclude if it's frozen raid case.
Zdenek
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