HP StorageWorks SAN Virtualization Services Platform Data Path Module User Guide (5697-0772, November 2010)

Glossary
This glossary defines acronyms and terms used with the SVSP solution.
access path A specific series of physical connections through which a device is recognized
by another device.
active boot set The boot set used to supply system software in a running system. Applies to the
DPM.
See also boot set.
active path A path that is currently available for use.
See also passive path, and in use path.
active/active RAID A storage device that presents virtual disks on multiple ports, and the virtual disks
are simultaneously active on all ports.
active/passive
RAID
A storage device that presents virtual disks on multiple ports of multiple storage
controllers, and at any point in time a virtual disk is only active on the ports of
one controller and passive on the ports of the other controllers. Applies to the
HP EVA.
active/standby
RAID
One storage device per path is in use and the others are in backup/standby
mode. See the product release notes.
ALUA A SCSI term for asymmetrical logical unit access.
asynchronous
mirroring
A mode of data mirroring in which the updates on the mirror site are always
lagging behind the source site.
auxiliary virtual
disk
In VSM, either of the following:
A backup virtual disk created by a migration task that initially resides on the
destination storage pool and switches to the source storage pool when the
•
task is complete. After task completion, the auxiliary virtual disk contains the
data that the original virtual disk created when the migration group was
created.
• A virtual disk created by mirroring for the VSM agent on a VSM server to
keep track of the state of the sync mirror group that mirrors the setup virtual
disk and its tasks.
back-end LU In VSM, a logical unit (LUN) of storage presented by a storage system (for
example, an EVA).
back-side path A path between the Data Path Module and the physical storage (for example,
an HP EVA).
boot set Either of two selectable locations provided by the Data Path Module for storing
a system software image.
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