Identifying exportable disks
To export a physical volume as a virtual device, the physical volume must have an IEEE volume attribute, a unique identifier (UDID), or a physical identifier (PVID).
About this task
To identify exportable disks, complete the following steps:
Procedure
- Determine whether a device has an IEEE volume attribute
identifier by running the following command from the Virtual I/O Server command line:
Disks with an IEEE volume attribute identifier have a value in thelsdev -dev hdiskX -attr
ieee_volname
field. Output similar to the following is displayed:
If the... cache_method fast_write Write Caching method False ieee_volname 600A0B800012DD0D00000AB441ED6AC IEEE Unique volume name False lun_id 0x001a000000000000 Logical Unit Number False ...
ieee_volname
field does not appear, then the device does not have an IEEE volume attribute identifier. - If the device does not have an IEEE volume attribute identifier,
then determine whether the device has a UDID by completing the following
steps:
- Type
oem_setup_env
. - Type
odmget -qattribute=unique_id CuAt
. The disks that have a UDID are listed.Output similar to the following is displayed:
Devices in the list that are accessible from other Virtual I/O Server partitions can be used in virtual Small Computer Serial Interface (SCSI) MPIO configurations.CuAt: name = "hdisk1" attribute = "unique_id" value = "2708ECVBZ1SC10IC35L146UCDY10-003IBXscsi" type = "R" generic = "" rep = "nl" nls_index = 79 CuAt: name = "hdisk2" attribute = "unique_id" value = "210800038FB50AST373453LC03IBXscsi" type = "R" generic = "" rep = "nl" nls_index = 79
- Type
exit
.
- Type
- If the device does not have either an IEEE volume attribute
identifier or a UDID, then determine whether the device has a PVID
by running the following command:
The disks and their respective PVIDs are listed. Output similar to the following is displayed:lspv
NAME PVID VG STATUS hdisk0 00c5e10c1608fd80 rootvg active hdisk1 00c5e10cf7eb2195 rootvg active hdisk2 00c5e10c44df5673 None hdisk3 00c5e10cf3ba6a9a None hdisk4 none None
- If the device does not have either an IEEE volume attribute
identifier, a UDID, or a PVID, then complete one of the following
tasks to assign an identifier:
- Upgrade your vendor software and then repeat this entire procedure, Identifying exportable disks, from the beginning. The latest versions of some vendor software include support for identifying devices by using a UDID. Before upgrading, ensure that you preserve any virtual SCSI devices that you created when using the versions of the software that did not support identifying devices by using a UDID. For more information and upgrade instructions, see the documentation that is provided by your vendor software.
- If the upgraded vendor software does not produce a UDID
or IEEE volume attribute identifier, then put a PVID on the physical
volume by running the following command:
chdev -dev hdiskX -attr pv=yes