Vladislav Bolkhovitin, on 07/10/2009 12:43 PM wrote:
Ronald Moesbergen, on 07/10/2009 10:32 AM wrote:
I've also long ago noticed that reading data from block devices is slower
than from files from mounted on those block devices file systems. Can
anybody explain it?
Looks like this is strangeness #2 which we uncovered in our tests (the first
one was earlier in this thread why the context RA doesn't work with
cooperative I/O threads as good as it should).
Can you rerun the same 11 tests over a file on the file system, please?
I'll see what I can do. Just te be sure: you want me to run
blockdev-perftest on a file on the OCFS2 filesystem which is mounted
on the client over iScsi, right?
Yes, please.
Forgot to mention that you should also configure your backend storage as
a big file on a file system (preferably, XFS) too, not as direct device,
like /dev/vg/db-master.
Thanks,
Vlad
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