[Ocfs2-users] Some questions about ocfs2

[Sunil Mushran]

# debugfs.ocfs2 -R "stats -h" /dev/sdy2 | grep "Cluster Size"
        Block Size Bits: 12   Cluster Size Bits: 17
12 = 4K
17 = 128K

Have you tried stracing the process?
# strace -tt -T  -o /tmp/strace.out  ...

Ulf Zimmermann wrote:
> Is there a way to see how a file system was formatted, i.e. the block
> size and cluster size? I currently have a 2TB file system, of which
> about 840GB are in use by around 9 million image files. Average size of
> these images is 60-100KB. Currently our production servers still have
> separate file systems on ext3 and we are doing nightly rsync from there
> to this ocfs2 volume. This currently takes ~6 hours, which seems a tad
> slow. The system spends most time during writing files which have
> changed on the production servers, with high I/O wait.
>
> The SAN this ocfs2 volume is on is pretty much idle, I only see up to
> about 20MB/sec traffic and the two nodes which have this volume mounted
> have a private GigE interconnect setup for cluster.conf.
>
> Any tips on how to debug where this slowness comes from? Or even
> suggestion to use another cluster file system for a scenario like this.
>
> Regards, Ulf.
>
>
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