Owner's manual

logon Also called login, it is a procedure whereby a user or net work connection is
identified as being an authorized network user or par ticipant.
loop See arbitrated loop.
loop I D Seven-bit values numbered contiguously from 0 to 126 d ecimal and represent
the 1 27 valid AL_PA values on a loop (not all 256 hexadecimal values a re
allowed as AL_PA values per Fibre Channel).
loop pair A Fibre Channel at tachment between a controller and physical disk drives.
Physical disk drives connect to controllers through paired Fibre Channel
arbitrated loops. There are two loop pairs, designated loop pair 1 and loop
pair 2. Each loo p pair c onsists of two loo ps (called loo p A and loop B) that
operate independently during normal operation, but provide mutual backup
in case one loop fails.
LTEA Last Termination Event Array. A two-digit HSV Controller number that identifies a
specific event that terminated an operation. Valid numbers range from 00 to 31.
LUN Logical Unit Number. A SCSI c onvention used to identify elements. The host
sees a virtual disk as a LUN. The LUN address a user assigns to a virtual disk for
aparticularhostwillbetheLUNatwhichthathostwillseethevirtualdisk.
management
agent
The HP Command View EVA software that controls and monitors the Enterprise
storage system. The software can exist on more than one management server in
a fabric. Each installation is a management agent.
management
agent event
Significant occurrence to or within the m anag ement agent software, or a n
initialized storage cell controlled or monitored by the managem ent agent.
Mb Megabit. A term defining a data transfer rate.
See also Mbps.
MB Megabtye. A term defining either:
• Adata
transfer rate.
• A measure of either storage or mem o ry capacity of 1,048,576 (2
20
)bytes.
See also MBps.
Mbps Megabits per second. A measure of bandwidth or data transfers occurring at a
rate of 1,000,000 (10
6
)bitspersecond.
MBps Megabytes per second. A measure of bandwidth or data transfers occurring at
a rate of 1,000,000 (10
6
)bytespersecond.
mean time be -
tween failures
See MTBF.
Mega A notation denoting a multiplier of 1 million (1,000,000).
metadata Information that a controller pair writes on the disk array. This information is
used to control and monitor the array and is not readable by the host.
micro meter See m.
mirrored caching A process in which half of each controller’s write cache mirrors the companion
controller’s write cache. The total memor y available for cached write data is
reduced by half, but the level of protection is greater.
mirroring The act of creating an exact copy or image of data.
MTBF Mean Time Between Failures. The average time from start of use to first failure in
a large population of identical systems, components, or d evices.
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Glossary