Product data

14 PowerVM Migration from Physical to Virtual Storage
2.2.1 The physical volume identifier (PVID)
The PVID is written to a disk when the disk has been made a member of an AIX
volume group and may be retained on the disk when the disk is removed from a
volume group.
The quickest way of determining whether a disk has a PVID is to use the
AIX/VIOS lspv command:
# lspv
hdisk0 000fe4012a8f0920 rootvg
active
hdisk1 none None
hdisk2 000fe4012913f4bd None
hdisk3 none None
hdisk4 000fe401106cfc0c None
hdisk5 000fe4012b5361f2 None
hdisk6 none None
hdisk7 none None
From the previous example of lspv command output:
򐂰 hdisk0 is a current member of the root volume group (rootvg).
򐂰 hdisk1 has never been in a volume group.
򐂰 hdisk2 has been in a volume group but is no longer a member.
Some of the commands used in this publication display a PVID as 32 digits, while
many of the other commands only display 16 digits. At the time of writing, only
the left-most 16 digits of a PVID are significant. Thus, for our purposes both of
the following PVIDs displayed are equivalent:
002631cd31ad04f5
002631cd31ad04f50000000000000000
2.2.2 The IEEE volume identifier
A disk may have an IEEE volume identifier assigned.
On a Virtual I/O Server, the lsdev command may be used to display the IEEE ID
(or ieee_volname, as it will be shown):
$ lsdev -dev hdisk2 -attr
attribute value description
user_settable
PR_key_value none Persistant Reserve Key Value
True
cache_method fast_write Write Caching method
False