On Tue, 21 Jun 2016, Michael Wyraz wrote:
> Hi,
>
> I do rsync based backups against a cephfs. If I do sync xattrs, rsync tries to
> delete ceph-internal xattrs (e.g. ceph.dir.entries) which fails with an error.
> xattrs does not get synchronized in this case.
> IMO the problem is, that ceph's internal attributes are exposed to the mounted
> fileystem (I can do "getfattr -n ceph.dir.entries *" on the mounted cephfs and
> get results). So rsync sees these xattrs and tries to remove it.
>
> Example output:
>
> rsync: rsync_xal_set:
> lremovexattr(""/backups/2016-05-31_00-09-32/etc/acpi/events"","ceph.dir.entries")
> failed: Operation not supported (95)
> rsync: rsync_xal_set:
> lremovexattr(""/backups/2016-05-31_00-09-32/etc/acpi/events"","ceph.dir.files")
> failed: Operation not supported (95)
> rsync: rsync_xal_set:
> lremovexattr(""/backups/2016-05-31_00-09-32/etc/acpi/events"","ceph.dir.subdirs")
> failed: Operation not supported (95)
> rsync: rsync_xal_set:
> lremovexattr(""/backups/2016-05-31_00-09-32/etc/acpi/events"","ceph.dir.rentries")
> failed: Operation not supported (95)
> rsync: rsync_xal_set:
> lremovexattr(""/backups/2016-05-31_00-09-32/etc/acpi/events"","ceph.dir.rfiles")
> failed: Operation not supported (95)
> rsync: rsync_xal_set:
> lremovexattr(""/backups/2016-05-31_00-09-32/etc/acpi/events"","ceph.dir.rsubdirs")
> failed: Operation not supported (95)
> rsync: rsync_xal_set:
> lremovexattr(""/backups/2016-05-31_00-09-32/etc/acpi/events"","ceph.dir.rbytes")
> failed: Operation not supported (95)
> rsync: rsync_xal_set:
> lremovexattr(""/backups/2016-05-31_00-09-32/etc/acpi/events"","ceph.dir.rctime")
> failed: Operation not supported (95)
I think the right fix here is to patch rsync to ignore ceph.* xattrs.
Does that seem reasonable?
Other possible workarounds might be:
- ignore setxattr and removexattr requests on these xattrs (return
success but do nothing)
- never show these xattrs in listxattr. this makes them less useful or
friendly :(
sage
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