On 12/17/2014 05:40 PM, Sage Weil wrote: > 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 > I'll check that, good point. > to see requests in flight (you may need to mount -t debugfs none > /sys/kernel/debug first). What kernel version? > I tried with 3.18 Also tried with ceph-fuse 0.89, same result. It is slower, but it also hangs at some point. > sage > -- Wido den Hollander 42on B.V. Ceph trainer and consultant Phone: +31 (0)20 700 9902 Skype: contact42on -- 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
