Ceph » CephFS

The output from ceph-debugpack can be found at the following location: [[http://cumulonim.biz/mds.tar.gz]] We were running the following version (but tested with HEAD/ad97bbb0a1e985b91ab0ffe9ae5b15cfce465211 as well):

ceph version 0.52 (commit:e48859474c4944d4ff201ddc9f5fd400e8898173)

We created a Ceph cluster on a single box with 3 monitors, 9 MDSes (6 active, 3 standby), and 5 OSDs. Note: we've seen the same issue when separated across several machines, but kept it down to one box for this report and for simplicity. After creating the cluster, we mounted CephFS from another server and ran the following line:

for D in {0..99}; do  mkdir -p /mnt/ceph/$D; for F in {0..99}; do echo "Hello $F in $D" > /mnt/ceph/$D/$F; done; done

In the specific instance (of the logs provided,) we were able to complete this command, but immediately found the MDSes to "stall" after trying to `ls /mnt/ceph/*` (we saw 2 directories returned prior to the command hanging.) Note: in other runs of this test, the command to create the files and directories would also stall. We ran these tests repeatedly with similar outcomes.