My VM environment is two Dell R610 PowerEdge servers with MD3000 PowerVault DAS through dual port PCI-e SAS 5/e cards on the servers and dual port SAS controllers on the PowerVault.
One ESXi 5.1 host sees the datastore on the MD3K, with active and standby path. Second host doesn't. Have swapped out the server PCI SAS card - twice. Have swapped PCI slots, removed/reseated PCI riser. Have swapped cables and controller channels. Reloaded ESXi 3 times - each time all hba storage adapter devices show up in vSphere, including the SAS 5/e. It, however, does not show any devices or paths on the SAS. Rescan doesn't find devices/paths either. Am thinking some kind of software issue, but need help figuring it out. Any ideas?