>> Von: Yaniv Kaul [yk...@redhat.com] >> Gesendet: Dienstag, 12. Januar 2016 13:15 >> An: Markus Stockhausen >> Cc: users@ovirt.org; Mike Hildebrandt >> Betreff: Re: [ovirt-users] NFS IO timeout configuration >> >> On Tue, Jan 12, 2016 at 9:32 AM, Markus Stockhausen stockhau...@collogia.de> >> wrote: >> Hi there, >> >> we got a nasty situation yesterday in our OVirt 3.5.6 environment. >> We ran a LSM that failed during the cleanup operation. To be precise >> when the process deleted an image on the source NFS storage. > > Can you share with us your NFS server details? >Is the NFS connection healthy (can be seen with nfsstat) >Generally, delete on NFS should be a pretty quick operation. > Y.
Hi Yaniv, we usually have no problems with our NFS server. From our observations we only have issues when deleting files with many extents. This applies to all OVirt images files. Several of them have more than 50.000 extents, a few even more than 300.000. > xfs_bmap 1cb5906f-65d8-4174-99b1-74f5b3cbc537 ... 52976: [629122144..629130335]: 10986198592..10986206783 52977: [629130336..629130343]: 10986403456..10986403463 52978: [629130344..629138535]: 10986206792..10986214983 52979: [629138536..629138543]: 10986411656..10986411663 52980: [629138544..629145471]: 10986214992..10986221919 52981: [629145472..629145575]: 10809903560..10809903663 52982: [629145576..629145599]: 10737615056..10737615079 Our XFS is mounted with: /dev/mapper/vg00-lvdata on /var/nas4 type xfs (rw,noatime,nodiratime,allocsize=16m) Why we use allocsize=16M? We once started with allocize=512MB. This led to sparse files that did not save much bytes. Because a single byte written resulted in a 512MB allocation. Thin allocation of these files resulted in long runtimes for formatting disks inside the VMS. So we reduced to 16MB as a balanced config This works quite well but not for remove operations. Better ideas? Markus
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