Installation guide

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VMware ESX Server Administration Guide
Also, if the bus sharing is Physical, commands that reserve, reset or release a shared
virtual disk are transmitted through to the physical disk, so other machines sharing
the disk can properly detect when a virtual disk has been reserved or reset. Therefore,
when you are sharing disks among virtual machines across physical machines for high
availability purposes, it is often best to put only a single VMFS with a single virtual disk
on each shared disk — that is, have only one virtual disk per physical disk. In such a
configuration, each virtual disk can be reserved and released independently.
To change the bus sharing setting, complete the following steps:
1. Log into the management interface as the appropriate user and be sure the
virtual machine you want to configure is powered off.
2. Point to the terminal icon for the virtual machine you want to configure and click
Configure Hardware.
3. Click Edit next to the appropriate SCSI controller.
4. Choose the bus sharing setting you want from the drop-down list, then click OK.