HP MSA 1040 SMU Reference Guide (762784-001, March 2014)

Glossary 181
metadata Data in the first sectors of a disk drive that stores all disk-, vdisk-, and volume-specific
information including vdisk membership or spare identification, vdisk ownership, volumes
and snapshots in the vdisk, host mapping of volumes, and results of the last media scrub.
MIB Management Information Base. A database used for managing the entities in SNMP.
mount To enable access to a volume from a host OS. Synonyms for this action include present and
map. See also host, map/mapping, and volume.
network port The Ethernet port on a controller module through which its Management Controller is
connected to the network.
network time protocol See NTP.
NTP Network time protocol.
object identifier See OID.
OID Object Identifier. In SNMP, an identifier for an object in a MIB.
orphan data See unwritable cache data.
Partner Firmware
Update
See PFU.
PCBA Printed circuit board assembly.
PFU Partner firmware update. The automatic update of the partner controller when the user
updates firmware on one controller.
PGR Persistent group reservations.
PHY One of two hardware components that form a physical connection between devices in a
SAS network that enables transmission of data.
physical layer See PHY.
point-to-point Fibre Channel Point-to-Point topology, where two ports are directly connected.
POST Power-on self test. Tests that run immediately after a device is powered on.
Power-On Self Test See POST.
power supply unit See PSU.
primary volume The volume that is the source of data in a replication set and that can be mapped to hosts.
For disaster recovery purposes, if the primary volume goes offline, a secondary volume can
be designated as the primary volume. The primary volume exists in a primary vdisk in the
primary (or local) storage system.
proxy volume A virtual volume in the local system that represents a volume in a remote system. Proxy
volumes are used internally by the controllers to perform actions such as transferring
replication data.
PSU Power supply unit. The power supply FRU.
recovery In an active-active configuration, recovery is the act of returning ownership of controller
resources to a controller (which was offline) from its partner controller. The resources include
volumes, cache data, host ID information, and LUNs and WWNs. See also failover.
remote replication Asynchronous (batch) replication of block-level data from a volume in a primary system to a
volume in one or more secondary systems by creating a replication snapshot of the primary
volume and copying the snapshot data to the secondary systems via Fibre Channel or iSCSI
links. The capability to perform remote replication is a licensed feature (Remote Snap).
remote syslog support See syslog.
replication image A conceptual term for replication snapshots that have the same image ID in primary and
secondary systems. These synchronized snapshots contain identical data and can be used
for disaster recovery.
replication set Associated primary and secondary volumes that are enabled for replication and that
typically reside in two physically or geographically separate storage systems. See primary
volume and secondary volume.