I'm pretty sure to XFS, "read-only" is not quite "read-only." My understanding is that XFS replays the journal on mount, unless it is also mounted with norecovery.
-- Adam On Sun, May 3, 2020, 22:14 Void Star Nill <void.star.n...@gmail.com> wrote: > Hello All, > > One of the use cases (e.g. machine learning workloads) for RBD volumes in > our production environment is that, users could mount an RBD volume in RW > mode in a container, write some data to it and later use the same volume in > RO mode into a number of containers in parallel to consume the data. > > I am trying to test this scenario with different file systems (ext3/4 and > xfs). I have an automated test code that creates a volume, maps it to a > node, mounts in RW mode and write some data into it. Later the same volume > is mounted in RO mode in a number of other nodes and a process reads from > the file. > > I dont see any issues with ext3 or 4 filesystems, but with XFS, I notice > that 1 or 2 (out of 6) parallel read-only mounts fail with "Structure needs > cleaning" error. What is surprising is that, the rest of 4 or 5 mounts will > be successful and I dont see any I/O issues on those - which suggests that > there shouldn't be any corruptions on the volume itself. Also note that > there is no other process writing to the volume at this time so no chance > of corruption that way. > > I am doing xfs mounts with "ro,nouuid" mount options. > > Any inputs on why I may be seeing this issue randomly? > > Regards, > Shridhar > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io > _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
