nfs performance of 2800.

Ian Mortimer ian at
Tue Jan 9 21:42:27 CST 2007

I've been testing nfs performance of a 2800 (RHEL4 x86_64, PERC 4e/Di,
Raid 5).  One simple test (bash loop appending lines to a text file)
gets these timings:

   to 2800 over nfs:                     20.072s

   to old file server over nfs:           4.437s

   on 2800 to local disk:                 0.438s

   on old file server to local disk:      0.464s

(Old file server is 32 bit, 2.4 series kernel)

The surprising result is the far worse nfs performance of the 2800
compared to the old file server.   Experimenting with mount options
(rsize, wsize) makes no difference.  nfsvers=2 makes it much worse!

Other tests - writing files with dd, copying or reading large files 
- get expected results:  the 2800 over nfs is never slower and in 
some cases more than twice as fast.

Any ideas?


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