Veritas Storage Foundation Intelligent Storage Provisioning 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

35Understanding ISP
About ISP concepts
About attributes
A storage attribute allows the properties of a LUN to be defined in an arbitrary
conceptual space. For example, attributes can describe properties such as:
■ Disk access name
■ Disk media name
■ Manufacturer
■ Model type
■ Physical location, such as rack number, frame number, floor, building, or site
■ Hardware RAID configuration
■ Failover properties
■ Performance properties
You can use disk tags to create storage attributes in addition to those that are
intrinsically associated with the disk hardware, and which are automatically
discovered or assigned by VxVM. Disk tags are administered by using the
vxdisk
command or the VEA graphical user interface. For example, the
vxdisk settag
command can be used to assign tags and optional values to each disk:
# vxdisk -g mydg settag Room=room1 mydg01 mydg02 mydg03 mydg04
# vxdisk -g mydg settag Room=room2 mydg05 mydg06 mydg07 mydg08
This sets the attribute tag Room on the disks (mydg01 through mydg08) with
values that represent the physical location (room1 or room2).
Attributes may be used to capture information about special features that
storage possesses, such as:
■ Hardware-supported cloning, such as EMC Business Continuity Volumes
(BCV)
■ Hardware-supported replication, such as the EMC Symmetrix Remote Data
Facility (SRDF)
■ Hardware redundancy, such as mirrored parity, and caching
It should only be necessary to enter such information manually if VxVM cannot
discover it automatically. An example of a user-defined attribute is physical
location.
Note: Attribute names and their string values are case sensitive. You can use the
vxdisk listtag command or the VEA graphical user interface to discover the
correct spelling of LUN attribute names.