You may be thinking of "lazytime". "relatime" only updates atime when updating mtime, to prevent being inconsistent.
On Mon, Dec 2, 2019 at 4:46 AM Oliver Freyermuth <[email protected]> wrote: > > Dear Cephers, > > we are currently mounting CephFS with relatime, using the FUSE client > (version 13.2.6): > ceph-fuse on /cephfs type fuse.ceph-fuse > (rw,relatime,user_id=0,group_id=0,allow_other) > > For the first time, I wanted to use atime to identify old unused data. My > expectation with "relatime" was that the access time stamp would be updated > less often, for example, > only if the last file access was >24 hours ago. However, that does not seem > to be the case: > > ---------------------------------------------- > $ stat > /cephfs/grid/atlas/atlaslocalgroupdisk/rucio/group/phys-higgs/ed/cb/group.phys-higgs.17620861._000004.HSM_common.root > ... > Access: 2019-04-10 15:50:04.975959159 +0200 > Modify: 2019-04-10 15:50:05.651613843 +0200 > Change: 2019-04-10 15:50:06.141006962 +0200 > ... > $ cat > /cephfs/grid/atlas/atlaslocalgroupdisk/rucio/group/phys-higgs/ed/cb/group.phys-higgs.17620861._000004.HSM_common.root > > /dev/null > $ sync > $ stat > /cephfs/grid/atlas/atlaslocalgroupdisk/rucio/group/phys-higgs/ed/cb/group.phys-higgs.17620861._000004.HSM_common.root > ... > Access: 2019-04-10 15:50:04.975959159 +0200 > Modify: 2019-04-10 15:50:05.651613843 +0200 > Change: 2019-04-10 15:50:06.141006962 +0200 > ... > ---------------------------------------------- > > I also tried this via an nfs-ganesha mount, and via a ceph-fuse mount with > admin caps, > but atime never changes. > Is atime really never updated with CephFS, or is this configurable? > > Something as coarse as "update at maximum once per day only" would be > perfectly fine for the use case. > > Cheers, > Oliver > > _______________________________________________ > ceph-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] _______________________________________________ ceph-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
