We are in the process of migrating our storage to a new EMC NS-480. The old primary storage was a Netapp filer. We are having issues with poor performance on the newly migrated Exchange servers. On the Netapp filers we were seeing iScsi response times of less than 30 ms. Now on the EMC we are seeing iScsi response times of up to 300 ms. This has severely impacted our Exchange production. The luns that are being used on the EMC are spread out over 5 FC raid groups of 5 disks each.
The exchange servers are Windows 2008 SP2.
We are not sure what to do at this point. EMC is also having a hard time diagnosing the issue.