I have a NSS Pool spanning 4 SAN volumes of 2TB a piece for a total pool of 8tb. No problems, until I need more space--but that's another issue. I wanted see if anyone has recommendations for NSS settings for such a big pool. I am using the defaults. Why I ask is that we are implementing a new Backup solution (Commvault) and our servers that have smaller pools, not spanning partitions get much better throughput.---identical hardware, HBA, RAM, etc.---just not 8tb of SAN volume. More of a ONE to ONE ratio---POOL to VOLUME to SAN VOLUME to Partition.

Could it be that the POOL spanning and it's size causing slowness?