HP StorageWorks SAN Virtualization Services Platform Best Practices Guide (5697-0935, May 2011)

Glossary
This glossary defines acronyms and terms used with the SVSP solution.
A
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.
B
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.
Business Copy
SVSP
An HP StorageWorks product that works with SAN storage systems to provide local replication
capabilities within the SVSP domain, providing local point-in-time (PiT) copies of data, using
snapshots of data, based on changes to virtual disks.
C
CLI Command line interface. The Data Path Module provides a CLI through the local administrative
console (serial port console), telnet, or SSH.
Continuous Access
SVSP
An HP StorageWorks product that works with SAN storage systems to provide asynchronous
data replication (remote mirroring) between SVSP domains to support disaster tolerance
requirements. Data replication can be bidirectional, meaning that an SVSP domain can be both
a source and a destination.
crash consistent The state of the media behind a logical unit after a server crash. Pending writes are lost.
cross-connected A property of a high-availability configuration in which both Data Path Modules connect to a
dual fabric SAN, allowing either Data Path Module to access both controllers of a dual-controller
storage array.
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