Hi,
I have retry the test, but with FUSE CephFS client. It seem everything is OK. Any explainantion? Is Kernel CephFS client less featured (more limited) and/or less stable than FUSE CephFS client like on RBD?
Best regards,
Date: Thu, 25 Aug 2016 00:25:22 +0700
From: Lazuardi Nasution <mrxlazuardin@xxxxxxxxx>
To: ceph-users@xxxxxxxxxxxxxx
Subject: CephFS Big Size File Problem
Message-ID:
<CA+u3GuLMxEt4hhyixcG45PXritGyt9N_ >t73aiHtb1XQS5OPm-g@mail.gmail. com
Content-Type: text/plain; charset="utf-8"
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.
Best regards,
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