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We just implemented two Terastation TS5410 Rackmounts, both configured for RAID 10.  One has version 3.5 firmware, but is configured for iSCSI only.  While it has similar IOPs, its CPU usage is actually pretty low, with load averages (15 minutes) staying below 1.00.

The other one, which is what I'm posting about, uses NFS, and is connected to our Citrix XenDesktop environment.  Even when the XenDesktop environment is doing nothing, we see random periods of high CPU usage (load averages between 7.0 and 11.0), which then cause sessions in XenDesktop to drop and reboot.  The only real difference is that this TS uses LVM for the NFS shares, where the other Terastation doesn't.

None of this correlates with network usage, as it consistently stays around 5MB/sec average.  Even spikes to 25MB/sec or even 100MB/sec don't correlate with CPU usage.

On both systems, everything else but what is necessary to administer is turned off, that includes any "Recycle Bin", antivirus, backup, etc. 

I called support, and aside from suggesting that we take it down (which is kind of hard as we are using it as an active failover -- the primary XenDesktop environment had a failure), that "the manager suggests that the high CPU is pretty normal". 

What I'm looking for is other's experiences, or if there's something else I can try to either make this work, or do I need to start looking elsewhere?