Up until vSphere, ESX(i) supported both SCSI-2 & SCSI-3 storage devices. This changed in vSphere, where ESX(i) 4.x supports only SCSI-3 storage devices.
That said, vSphere still utilizes SCSI-2 reservations which should be minimized as much as possible to minimize impact on running guest VMs. vSphere SCSI-3 VM persistent reservations are used to support Win2k8 WSFC (Windows Server Failover Clustering).
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That said, vSphere still utilizes SCSI-2 reservations which should be minimized as much as possible to minimize impact on running guest VMs. vSphere SCSI-3 VM persistent reservations are used to support Win2k8 WSFC (Windows Server Failover Clustering).
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