On Sun, Aug 28, 2016 at 1:57 AM, Lazuardi Nasution <mrxlazuar...@gmail.com> wrote: > 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? >
No, idea. I never encounter issue like this. Maybe there is other issue made you feel that writing small fileworks, but writing large file does not. Did you try writing small file again after writing large file failed. Regards Yan, Zheng > Best regards, > >> >> Date: Thu, 25 Aug 2016 00:25:22 +0700 >> From: Lazuardi Nasution <mrxlazuar...@gmail.com> >> To: ceph-users@lists.ceph.com >> Subject: [ceph-users] CephFS Big Size File Problem >> Message-ID: >> >> <ca+u3gulmxet4hhyixcg45pxritgyt9n_t73aihtb1xqs5op...@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, > > > _______________________________________________ > 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
