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" <gfarnum@xxxxxxxxxx> wrote:
On Wed, Aug 24, 2016 at 10:25 AM, Lazuardi Nasution
<mrxlazuardin@xxxxxxxxx> 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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