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 <mrxlazuar...@gmail.com> > To: ceph-users@lists.ceph.com > Subject: [ceph-users] 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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