On Jul 24, 2009, at 10:49 AM, Sam Lang wrote:
dd'ing from /dev/zero to /dev/null on the PVFS2 node: 1.5 GB/s
dd'ing from /dev/zero to raid locally without PVFS2: 262 MB/s
dd'ing from /dev/zero to PVFS2 on the same node or on the same
switch (doesn't seem to matter): 54 MB/s.
pvfs2fuse or kmod?
Sorry about not being clear: pvfs2fuse.
I suspect a networking issue but what's odd to me is that read speeds
are much closer to the local performance than write speeds. Your
suggestion of reading from a null-aio trove and writing to /dev/null
got more than 200 MB/s through pvfs2. Both Syncs are set to 'no' in
the configuration file, so I don't expect a metadata bottleneck. But
when running IOZone, rewrite is also faster than write. Could there
be some bottleneck in the metadata updates and growing of files?
Thanks.
~Milo
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