On Sun, Mar 15, 2015 at 7:06 PM, Yan, Zheng <ukernel@xxxxxxxxx> wrote: > On Sat, Mar 14, 2015 at 7:03 AM, Scottix <scottix@xxxxxxxxx> wrote: >> ... >> >> >>> The time variation is caused cache coherence. when client has valid >>> information >>> in its cache, 'stat' operation will be fast. Otherwise the client need to >>> send >>> request to MDS and wait for reply, which will be slow. >> >> >> This sounds like the behavior I had with CephFS giving me question marks. >> When I had a directory with a large amount of files in it and the first ls >> -la took a while to populate and ended with some unknown stats. The second >> time I did an ls -la it ran quick with no question marks. My inquiry was if >> there is a timeout that could occur? since it has to go ask the mds on a >> different machine it seems plausible that the full response is not coming >> back in time or fails to get all stats at some point. > > unknown stats shouldn't happen. which kernel are you using? can you reproduce > this issue with ceph-fuse? See https://www.mail-archive.com/ceph-users@xxxxxxxxxxxxxx/msg17445.html for more context. It's an old kernel and happens on ceph-fuse. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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