Setting The Host Mode For The Disk Array Ports; Setting The Uuid - HP StorageWorks P9000 Configuration Manual

3. For all LUNs if host mode option 33 is used, the DGA device number is the UUID value for
the LUN.
4. Once all paths are defined, use the SYSMAN utility on each OpenVMS system in the SAN
to discover the array ports and LUNs just added.
For a single system:
$run sys$system:sysman io autoconfigure/LOG
For all systems in an OpenVMS cluster:
$run sys$system:sysman
sysman> set environment/cluster
sysman> io autoconfigure/log
5. Verify the online status of the P9000 LUNs, and confirm that all expected LUNs are shown
online.

Setting the host mode for the disk array ports

After the disk array is installed, you must set the host mode for each host group that is configured
on a disk array port to match the host OS. Set the host mode using LUN Manager in Remote Web
Console or Command View Advanced Edition. For procedures, see the applicable user guide
available at http://www.hp.com/support/manuals. If these are not available, the HP service
representative can set the host mode using the SVP.
The required host mode setting for OpenVMS is 05.
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 15 Host mode setting (OpenVMS)
Host Mode
33

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 51 1 (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).
54 OpenVMS
Description
Use this host mode to enable the option that sets the UUID