Specifications

CHAPTER 7 High-Availability Configurations with VMware GSX Server
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For example, if the disk scsi1:0.filename is defined in the configuration file as
scsi1:0.fileName = "/<path_to_config>/vmSCSI.vmdk"
then the reservation lock file for this disk has the default name
/<path_to_config>/vmSCSI.vmdk.RESLCK
You can provide your own lock file name. Add a definition for
scsi1:0.reslckname to the configuration file. For example, if you add
scsi1:0.reslckname = "/tmp/scsi1-0.reslock"
to the configuration file, this name overrides the default lock file name.
Selecting the Disk
Once SCSI reservation is enabled for a disk — that is, the scsi[n].sharedBus =
"virtual" and disk.locking = "false" settings are added to the
configuration file for each virtual machine wanting to share this disk — you need to
point each virtual machine to this disk.
Sharing a Disk on the scsi0 Bus
VMware does not recommend sharing a disk on SCSI bus 0. This bus is usually used for
the boot disk. If you share the boot disk, you run the risk of corrupting it, as the boot
program is not aware that the disk is being shared and can write to the disk regardless
of whether or not it is being shared. It is far more secure to use SCSI reservation on a
data disk located on a different bus.