[Ocfs2-users] OCFS2 slow with multiple writes

[Sunil Mushran]

Use writeback. Ordered data requires the data to be flushed
before journal commit. And flushing 40G takes time.

mount -t data=writeback DEVICE PATH

On 10/20/2011 03:05 PM, Prakash Velayutham wrote:
> Hi,
>
> OS - SLES 11.1 with HAE
> OCFS2 - 1.4.3-0.16.7
> Cluster stack - Pacemaker
>
> I have Heartbeat Filesystem monitor that monitors the OCFS2 file system for availability. This monitor kicks in every minute and tries to write a file using dd as below.
>
> dd of=/var/lib/mysql/data1/.Filesystem_status/default_bmimysqlp3 oflag=direct,sync bs=512 conv=fsync,sync
>
> If the OCFS2 file system is busy, like when I try to create 2 large files (20GB each) in the OCFS2 directory, I see that the above monitor process hangs until the 2 files are created. But this causes Pacemaker to fence the node as the RA is configured for a timeout of 45secs and the 2 file creations do take more than that. The OCFS2 file system is mounted as below.
>
> /dev/mapper/bmimysqlp3_p4_vol1 on /var/lib/mysql/data1 type ocfs2 (rw,_netdev,nointr,data=ordered,cluster_stack=pcmk)
>
> Is there something wrong with the file system itself that a small file creation hangs like that? Please let me know if you need any more information.
>
> Thanks,
> Prakash
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