Host multipathing
For XP7 LUNS, the ESXi host detects and uses the VMW_SATP_DEFAULT_AA Storage Array Type
Plugin (SATP). The plugin has these possible Path Policies (PSP):
• VMW_PSP_FIXED (default)
• VMW_PSP_RR (HP recommended setting)
• VMW_PSP_MRU
IMPORTANT: The default Path Policy is VMW_PSP_FIXED; however, HP recommends using
VMW_PSP_RR.
Connecting the disk array
The HP service representative performs the following steps to connect the disk array to the host:
1. Verifying operational status of the disk array channel adapters, LDEVs, and paths.
2. Connecting the Fibre Channel cables between the disk array and the fabric switch or host.
3. Verifying the ready status of the disk array and peripherals.
Setting up virtual machines (VMs) and guest operating systems
Setting the SCSI disk timeout value for Windows VMs
To ensure Windows VM’s (Windows 2000 and Windows Server 2003) wait at least 60 seconds
for delayed disk operations to complete before generating errors, you must set the SCSI disk timeout
value to 60 seconds by editing the registry of the guest operating system as follows:
CAUTION: Before making any changes to the registry file, make a back up copy of the existing
file.
1. Start the registry editor: select Start > Run, enter regedit.exe, and click OK.
2. In the directory tree in the left panel, select HKEY_LOCAL_MACHINE > System >
CurrentControlSet > Services > Disk.
3. In the right pane locate the DWORD entry “TimeOutValue.” and right click. Select Modify,
then set the data value to x03c (hexadecimal) or 60 (decimal).
NOTE: If the DWORD “TimeOutValue” does not exist, click Edit > New> DWORD value and
enter the name “TimeOutValue.”
Sharing LUNs
To share LUNs between VMs within a single ESX server, set the SCSI controller to virtual mode. To
share LUNs across multiple ESX servers or in a virtual to physical configuration, set the SCSI
controller to physical mode.
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