On 2017-11-16 12:47, Zdenek Kabelac wrote: > Dne 16.11.2017 v 12:02 Alexander 'Leo' Bergolth napsal(a): >> On 2017-11-13 15:51, 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. > > From the plain look over those file - it doesn't even seem there is > anything wrong with dm devices as such. > > So it looks like possibly XFS got into some unhappy moment. > > I'd probably recommend to open regular Bugzilla case and attach files > from your directory. OK. > You can try if individual devices in the 'stack' are blocked. > i.e. try 'dd' read from every 'dm' if there is something blocked. No device is currently blocking. I can read from all LV devices (including meta devices), all underlying PVs and all filesystems: for dev in $(lvs -a -olv_dm_path --noheadings); do echo $dev; dd if=$dev of=/dev/null bs=4k count=10000 iflag=direct; done for pv in $(pvs -oname --noheadings); do echo $pv dd if=$pv of=/dev/null bs=4k count=10000 iflag=direct done echo 3 >/proc/sys/vm/drop_caches for mp in $(findmnt -t xfs,ext4 -o TARGET -l -n); do echo $mp; tar -cf- --one-file-system "$mp" 2>/dev/null| head -c $((1024**3)) >/dev/null; done > From status all device looks fully operational and also process stack > trace do look reasonable idle. > > I'm not sure how 'afs' is involved here - can you reproduce without afs ? OK. I'll try. Thanks for your help! --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/
