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The following host group mode (option) is available for OpenVMS:

Table 2 Host mode setting

Host Mode

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 above 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).

If host mode option 33 is not set, then the default behavior is to present the volumes to the OpenVMS

host by calculating the decimal value of the hexadecimal CU:LDEV value. That calculated value will

be the value of the DGA device number.

Description

Use this host mode to enable the option that sets the UUID

XP Disk Array Configuration Guide: OpenVMS