6.5.1

vSphere MSCS Setup Checklist 6
When you set up MSCS on ESXi, see the checklists to congure your environment according to the
requirements. You can also use the checklists to verify that your setup meets the requirements if you need
technical support.
Requirements for Clustered Disks
Each type of clustered disk has its own requirements, depending on whether it is in a single-host cluster or
multihost cluster.
Table 6‑1. Requirements for Clustered Disks
Component Single-Host Clustering Multihost Clustering
Clustered virtual disk (.vmdk)
SCSI bus sharing mode must be set
to virtual.
Not supported.
Clustered disks, virtual
compatibility mode (non-pass-
through RDM)
Device type must be set to virtual
compatibility mode.
SCSI bus sharing mode must be set
to virtual mode.
A single, shared RDM mapping le
for each clustered disk is required.
Device type must be set to virtual
compatibility mode for cluster across boxes,
but not for standby host clustering or cluster
across boxes on Windows Sever 2008.
SCSI bus sharing mode must be set to
physical.
Requires a single, shared RDM mapping le
for each clustered disk.
See VMware knowledge base article
hp://kb.vmware.com/kb/1016106 to mark the
device as perennially reserved on RDM LUNs
used for MSCS virtual machines.
This conguration is not supported on
Windows Server 2008 and higher. This is a
valid conguration only on Windows Server
2003.
Clustered disks, physical
compatibility mode (pass-
through RDM)
Not supported. Device type must be set to Physical
compatibility mode during hard disk creation.
SCSI bus sharing mode must be set to physical
(the default).
A single, shared RDM mapping le for each
clustered disk is required.
All types All clustered nodes must use the same target ID (on the virtual SCSI adapter) for the
same clustered disk.
A separate virtual adapter must be used for clustered disks.
VMware, Inc. 35