Performance Issue with multiple dataserver

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Hi,

I have done pNFS setup with single Dataserver and Two Dataserver and ran the IOzone tool on both, I found that the performance with multiple dataservers is less than the performance with single dataservers.

Here are some numbers, which were captured by the IOzone tool.


							  4	  8	 16	 32	 64	 128	 256	 512	1024	<== Record Length in KB
With Single Dataserver:
Read operation for file size 1 MB-		66415	66359	63630	70358	86223	70256	66047	66068	68489	<== IO kB/sec
Write operation for file size 1 MB-		18827	16920	18846	17039	18896	17009	17173	19206	17947	<== IO kB/sec

With Two Dataservers :
Read operation for file size 1 MB-		36882	381198	38150	38084	38749	33663	34398	37313	37847	<== IO kB/sec
Write operation for file size 1 MB-		5461	4661	5586	4870	5227	4922	4214	5572	4658	<== IO kB/sec


Can somebody tell me What could be the issue....
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