See this. You can set the number of datafiles (i.e., the number of
servers across which things are striped) via attributes.
http://www.mail-archive.com/[email protected]/msg01478.html
Rob
On Dec 1, 2010, at 2:30 AM, Zhou Jiang wrote:
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
iozone(read/write) 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
network 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
tuning parameters or others?
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