HP StorageWorks 2000 Modular Smart Array Reference Guide (481599-003, August 2008)

316 HP StorageWorks 2000 Family Modular Smart Array reference guide • August 2008

ULP Unified LUN Provisioning. A MSA2012sa storage system feature that

makes all volumes in the system accessible to hosts through all host

ports on both controllers. ULP incorporates Asymmetric Logical Unit

Access (ALUA) extensions.

UT Universal Time. A modern time system related to the conventional

Greenwich Mean Time (GMT) used for time zones.

UPS Uninterruptible Power Supply.

vdisk Abbreviation for virtual disk.

vdisk spare A disk drive that is marked as a spare to support automatic data

rebuilding after a disk drive associated with a virtual disk fails. For a

vdisk spare to take the place of another disk drive, it must be at least

equal in size to the failed disk drive and all of the virtual disks

dependent on the failed disk drive must be redundant—RAID 1, 10, 3,

5, 6, or 50.

verify A process that checks the integrity of the redundant data on fault-

tolerant virtual disks. For RAID 3, 5, 6, and 50, the verify process

recalculates the parity of data stripes in each of the virtual disk’s RAID

stripe sets and compares it with the stored parity. For RAID 1 and 10,

the verify process checks for mirror mismatches. The number of

inconsistencies found, which can indicate a failing drive, is reported in

the event log.

virtual disk For MSA2000 Family storage systems, a set of disk drives that share a

RAID level and drive type, and across which host data is spread for

redundancy or performance.

volume A logical subdivision of a virtual disk. Multiple LUNs can be assigned

to the same volume, one for each host port given access to the volume.