When a new host group is added, additional host group modes (options) can be configured. The
storage administrator must verify if an additional host group mode is required for the host group.
The following host group mode (option) is available for OpenVMS:
Table 12 Host mode setting (OpenVMS)
DescriptionHost Mode
Use this host mode to enable the option that sets the UUID33
Setting the UUID
HP recommends that OpenVMS customers use host mode option 33 to enable the UUID feature.
This increases the capabilities for OpenVMS hosts that access the disk array, by:
• Allowing the presentation of CU:LDEVs before 7F:FF to the OpenVMS hosts.
• Allowing the OpenVMS system administrator to define the DGA device number to present to
the OpenVMS host.
If use of host mode option 33 is enabled after devices are already presented to an OpenVMS
host, HP recommends rebooting the OpenVMS host. Though SYSMAN IO AUTO can be used to
discover new DGA devices, this helps avoid problems with stale data structures within OpenVMS.
SAN boot and UUID with OpenVMS. The UUID can be used with OpenVMS for Integrity servers.
This includes the system disk, quorum disk, and DOSD volumes. However for OpenVMS AlphaServer
hosts, the UUID for those volumes must be set to the decimal value of the hexadecimal value of the
CU:LDEV value. If the CU:LDEV value is 01:FF, then the UUID must be set to 511 (the decimal value
of 01FF). Thus, none of these volumes can have a CU:LDEV value greater than 7F:FF. Additionally,
these volumes must use LUN numbers 1 to 255. These are limitations of the AlphaServer firmware
used (both for the definition of known paths by the wwidmgr and by the boot code).
Installing and configuring the disk array 43
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