Hi, I have rebooted the Nova compute node with D state, so I cannot check that anymore.
Best regards, On Thu, Aug 25, 2016 at 7:58 PM, Yan, Zheng <uker...@gmail.com> wrote: > On Thu, Aug 25, 2016 at 11:12 AM, Lazuardi Nasution > <mrxlazuar...@gmail.com> wrote: > > 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. > > > > login to the node that run dd. find process id of dd. run 'cat > /proc/<PID of dd>/stack. This should tell us where does dd hang. > > Regard > Yan, Zheng > > > > 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 > > > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > >
_______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
