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. 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. Cheers, --leo -- e-mail ::: Leo.Bergolth (at) wu.ac.at fax ::: +43-1-31336-906050 location ::: IT-Services | Vienna University of Economics | Austria _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
