On Fri, 14 Jun 2013, Karol Jurak wrote: > Hi, > > I noticed that writing to RBD image using kernel driver while it's snapshot > is being created causes I/O errors and the filesystem (reiserfs) eventually > aborts and remounts itself in read-only mode: > > [192507.327359] end_request: I/O error, dev rbd7, sector 818528 > [192507.331510] end_request: I/O error, dev rbd7, sector 819200 > [192507.348478] end_request: I/O error, dev rbd7, sector 408 > [192507.352647] REISERFS abort (device rbd7): Journal write error in > flush_commit_list > > Is this happening by design or is it a bug? I know that I should freeze the > filesystem before attempting to create a snapshot but these I/O errors seem > unnecessary to me. If it's really impossible to write to an image while it's > snapshot is being created couldn't write requests be blocked until > snapshotting completes? > > I'm using ceph 0.56.6 and kernel 3.4.48.
This is definitely a bug; you should be able to create a snapshot at any time. After a rollback, it should look (to the fs) like a crash or power cycle. How easy is this to reproduce? Does it happen every time? sage > > -- > Karol Jurak > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
