Hello Mike and Jason, as described in my last mail i converted the filesystem to ext4, set "sysctl vm.dirty_background_ratio=0" and I put the regular workload on the filesystem (used as a NFS mount). That seems so to prevent crashes for a entire week now (before this, the nbd device crashed after hours/~one day). XFS on top of nbd devices really seems to add additional instability situations. The current workaround causes very high cpu load (40-50 on a 4 cpu virtual system) and up to ~95% iowait if a single client puts a 20GB File on that volume. What is your current state in correcting this problem? Can we support you in testing the by running tests with custom kernel- or rbd-nbd builds? Regards Marc Am 13.09.19 um 14:15 schrieb Marc Schöchlin: >>> Nevertheless i will try EXT4 on another system..... > I converted the filesystem to a ext4 filesystem. > > I completely deleted the entire rbd ec image and its snapshots (3) and recreated it. > After mapping and mounting i executed the following command: > > sysctl vm.dirty_background_ratio=0 > > Lets see, what we get now.... > > Regards > Marc > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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