HP StorageWorks XP24000/XP20000 Disk Array Owner Guide (AE131-96081, September 2010)

mirroring
consistency
The consistency (usability) of data in a volume (for example, S-VOL).
MIX A circuit board in the disk control unit that includes disk adapters and channel
adapters for interfacing disk drives and the host to cache memory.
MR Magnetoresistive.
ms, msec Millisecond.
mutual hot
standby system
Two servers that are poised to cover for each other if necessary.
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.
OLM Optical link module.
PA Physical address.
partition The act of dividing a specific physical disk into two or more areas as if there are
two or more physical disks.
path A path is created by associating a port, a target, and a LUN ID with one or more
LDEVs. Also known as a LUN.
PCI Peripheral component interconnect. The PCI bus typically runs at speeds of 33
MHz or 66 MHz and is usually 32 bits wide. This means that it passes 32 bits
of data simultaneously as if down 32 separate wires. Some of the most recent
computers include wider 64-bit PCI buses, and already certain very high-end
video capture cards offer improved performance if connected to a 64-bit PCI
bus.
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 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.
RAID group A group of disks configured to provide enhanced redundancy, performance, or
both. Specifically, four or eight physical hard disk drives (HDDs) installed in an
XP disk array and assigned a common RAID level.
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
RAID1, RAID5 and RAID6. Not all of these RAID levels are supported by all XP
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