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SCSI Reservation Support
SCSI reservation support is limited by the following:
  • You can enable SCSI reservation for SCSI virtual and physical disks. No other type of SCSI devices can use SCSI reservation in a virtual machine. Specifically, you cannot enable SCSI reservation for a SCSI disk that is configured as a generic SCSI device. For more information about generic SCSI, see Connecting to a Generic SCSI Device.
    • Note: VMware supports SCSI reservation when used with preallocated virtual disks. Support for SCSI reservation with growable virtual disks and physical disks is considered experimental. For high-availability configurations, use SCSI reservation with preallocated virtual disks.
  • SCSI disks can be shared via SCSI reservation among virtual machines running on the same host. This means that the configuration files for the virtual machines must all be located on the same GSX Server host. However, the disk or disks the virtual machines are sharing can be located remotely on a different host.
  • A SCSI virtual disk can be located on a host with any type of hard disk (for example, IDE, SCSI or SATA). A shared physical disk must always be a SCSI disk.
  • GSX Server virtual machines currently support only the SCSI-2 disk protocol, and not applications using SCSI-3 disk reservations. All popular clustering software (including MSCS and VCS) currently use SCSI-2 reservations.


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