HP StorageWorks XP20000/XP24000 - Disk Array Owner's Manual page 60

mirroring The consistency (usability) of data in a volume (for example, S-VOL).
consistency
mm Millimeters.
MR Magnetoresistive.
ms, msec Milliseconds.
mutual hot Two servers that are poised to cover for each other if necessary.
standby system
NAS Network attached storage.
node Logically speaking, an environment where instances can be executed. Physically,
a processor, which is an element of a cluster system.
NVS Nonvolatile storage.
OFC Open Fibre Control.
OLM Optical link module.
OS Operating system.
PA Physical address.
partition Dividing a specific physical disk into two or more areas as if there are two or
more physical disks.
path Paths are created by associating a port, a target, and a LUN ID with one or
more LDEVs.
PCI Power control interface or peripheral component interconnect.
port A physical connection that allows data to pass between a host and the disk
array. The number of ports on an XP disk array depends on the number of
supported I/O slots and the number of ports available per I/O adapter. The XP
family of disk arrays supports Fibre Channel (FC) ports as well as other port
types. Ports are named by port group and port letter, such as CL1-A. CL1 is the
group, and A is the port letter.
P-P Point-to-point.
PS Power supply.
RS Russellstoll (registered trademarkd), a brand of electrical plugs and receptacles
manufactured by Thomas & Betts Corporation.
RAID Redundant array of independent disks.
RAID group One or two array groups formatted with a common RAID level. RAID1 parity
groups consist of 4 HDDs (2D+2D) or 8 HDDs (4D+4D). RAID5 parity groups
include a parity disk but also consist of 4 HDDs (3D+1P) or 8 HDDs (7D+1P).
All RAID6 array groups are made up of 8 HDDs (6D+2P).
RAID level A RAID Level is one of the ways that disk drives are grouped together to improve
performance, data availability/reliability or both. RAID levels are defined from
RAID0 to RAID6. HP StorageWorks Disk Arrays in the XP product family support
60 Glossary for the HP XP24000/XP20000 Disk Array