Hardware manual

Group Administration Glossary
Glossary–7
MPIO
Acronym for multipath I/O. Multiple connections from an iSCSI initiator t
o targets on a PS Series Group over the
network to provide redundancy and enhance performance. See device-specific module (DSM).
MPIO properties tab
(HIT) A EqualLogic-specific tab on the iSCSI Initiator properties page that provides status information about
multipathing
sessions. The ehcmn.log file is a rotating log file (such as ehcm0.log) containing the data displayed in
the MPIO properties tab. See MPIO.
notification
(Auto-Snapshot Manager, Group Manager) The method that a group us
es to inform you of significant events
through e-mail, remote syslog files, and SNMP traps.
path failover
(hardware, Host Integration Tools) Relocating data traf
fic from a failed network path to a functional network path.
This can occur automatically if the computer's software and hardware is configured for failover. MPIO provides
server-side path failover.
path uptime
The elapsed time during which a session is active, displayed in the
MPIO properties tab.
pool
Storage space provided by one to four group members. You assign volumes to a specific pool and load balancing
operates
only within pools. See load balancing and merging pools
pool administrator
(Group Manager) An account on a PS Series group that has permission to mana
ge objects only in a specific pool or
set of pools for a group. Compare to group administrator.
power supply
(hardware) Hot-swappable hardware component, sometimes integrated with
a cooling module, that enables you to
connect a PS Series array to a source of power. Arrays are shipped with redundant power supplies. An array can
continue to operate if one power supply fails. Dell recommends that you connect power supplies to different
sources of power, preferably on separate circuits.
primary group
(Group Manager) In a replication partnership
the group containing the original volume. See secondary group.
primary volume
(Group Manager) A volume configured for
replicati
on to a replication partner.
promote
(Group Manager) To convert a replica set in a replication configuration into a volume. See demote.
PS Ser
ies array
A single EqualLogic iSCSI storage unit, us
ually configured as a PS Series Group. You can join multiple PS Series
arrays into a larger PS Series Group and manage them as a single iSCSI SAN.
PS Series group
An iSCSI storage entity comprised of one or more PS
Series storage arrays that you access through a single IP
address and manage as a storage area network (SAN).
Queue-depth reporting
(SAN HQ) The average number of outstanding I/O operations at the
start of each incoming I/O operation.