Hi Gregory, Since I have mounted it with /etc/fstab, of course it is kernel client. What log do you mean? I cannot find anything related on dmesg.
Best regards, On Aug 25, 2016 00:46, "Gregory Farnum" <gfar...@redhat.com> wrote: > On Wed, Aug 24, 2016 at 10:25 AM, Lazuardi Nasution > <mrxlazuar...@gmail.com> wrote: > > Hi, > > > > I have problem with CephFS on writing big size file. I have found that my > > OpenStack Nova backup was not working after I change the rbd based mount > of > > /var/lib/nova/instances/snapshots to CephFS based (mounted on > /etc/fstab on > > all Nova compute nodes). I couldn't relize the cause until I tried to do > > some test below. > > > > [root@compute-aa instances]# sudo -S -u nova dd if=/dev/zero > > of=./snapshots/test/test.dat bs=4096 count=1024 > > 1024+0 records in > > 1024+0 records out > > 4194304 bytes (4.2 MB) copied, 0.002956 s, 1.4 GB/s > > > > It seem that making 4.2MB size file is OK. The "test" folder was been > > created by nova user too. > > > > [root@compute-aa instances]# sudo -S -u nova dd if=/dev/zero > > of=./snapshots/test/test.dat bs=4096 count=1048576 > > > > This test was hang and gave me "D state" of dd process which cannot be > > killed, so I must reboot that node. This make afraid to do some more test > > with lower size. When I tried to see the folder content, I found > following > > result. > > > > [root@compute-aa ~]# ls -lah /var/lib/nova/instances/snapshots/test/ > > total 0 > > drwxr-xr-x 1 nova nova 0 Aug 24 22:35 . > > drwxr-xr-x 1 nova nova 0 Aug 24 22:33 .. > > -rw-r--r-- 1 nova nova 0 Aug 24 22:35 test.dat > > > > I prefer to use CephFS since the snapshot folder is only for temporary. > > Please help me to solve this problem. > > Are you using ceph-fuse or the in-kernel CephFS client? Have you > checked for errors in the client's log or dmesg? > -Greg >
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