On Wed, 17 Dec 2014, Wido den Hollander wrote: > Hi, > > Today I've been playing with CephFS and the morning started great with > CephFS playing along just fine. > > Some information first: > - Ceph 0.89 > - Linux kernel 3.18 > - Ceph fuse 0.89 > - One Active MDS, one Standby > > This morning I could write a 10GB file like this using the kclient: > $ dd if=/dev/zero of=10GB.bin bs=1M count=10240 conv=fsync > > That gave me 850MB/sec (all 10G network) and I could read the same file > again with 610MB/sec. > > After writing to it multiple times it suddenly started to hang. > > No real evidence on the MDS (debug mds set to 20) or anything on the > client. That specific operation just blocked, but I could still 'ls' the > filesystem in a second terminal. > > The MDS was showing in it's log that it was checking active sessions of > clients. It showed the active session of my single client. > > The client renewed it's caps and proceeded. > > I currently don't have any logs, but I'm just looking for a direction to > be pointed towards. Hmm. Try cat /sys/kernel/debug/ceph/*/mdsc cat /sys/kernel/debug/ceph/*/osdc to see requests in flight (you may need to mount -t debugfs none /sys/kernel/debug first). What kernel version? sage -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
