[Pvfs2-users] pvfs2 performance tuning
ligon at clemson.edu
Wed Dec 1 10:00:29 EST 2010
You have a bottleneck by using only one metadata server. Make all 32
nodes BOTH i/o and meta data servers. Grouping the servers like you did
is a GOOD thing.
> HI, all
> Now I have 32 nodes, both are used as IO servers and clients, one as
> metadata server. When I write a different
> file in each client(e.g. client1 write /mnt/pvfs2/file1, client2 write
> /mnt/pvfs2/files), the aggregate io throughout tested by
> is only half of performance of 4 nodes(both as IO servers and clients).
> I think each file are striped to 32 nodes will cause the additional
> and data transaction overhead.
> If each file are only striped to small scale nodes(such as only 4 nodes
> among 32), the performance will be improved ?
> But when I use twod_stripe mode, which divides the 32 IO servers into 7
> groups, each group strip factor is 256 and stripe size is 32M, the
> performance is not improved as expected.
> Would you please tell me how to control each file to be stored into
> different IO servers or improve the pvfs2 performance in 32 nodes by
> parameters or others?
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