HP 3PAR StoreServ Concepts Guide: HP 3PAR OS 3.1.3

HP 3PAR System
Tuner Software
The utility that enables the system to reallocate space usage in order to take advantage of
additional resources, such as added hardware or updated CPGs. The System Tuner identifies
underused chunklets and overused volumes, and balances the usage.
HP 3PAR Thin
Provisioning
Software
Software that enables you to create a virtual volume that allocates resources from the CPG on
demand and in small increments.
HP 3PAR Virtual
Copy Software
Software that enables you to create virtual copies (aka snapshots) of virtual volumes. To create
a virtual copy, the system uses the copy-on-write technique, which creates an up-to-date snapshot
at the same time as data is written to the host.
HP 3PAR Virtual
Domains Software
Software that enables you to create distinct domains with domain-specific users and objects.
IMP Initiator Mode Prohibited. A system setting that, when enabled, prevents a port from being set to
initiator mode.
inactive host A host that is known to the HP 3PAR OS, but is not recognized as connected to any system port
at the moment.
independent
electrical circuit
An electrical circuit that does not share a circuit breaker with another electrical circuit.
initiator mode The firmware setting for a Fibre Channel port that is connected to a drive cage.
initiator port A port that is connected to and relays commands to physical disks within a drive cage. Also
known as a disk port.
iSCSI adapter An iSCSI PCI host bus adapter (HBA) located in a controller node. An iSCSI adapter connects a
controller node on an iSCSI port to a host.
iSCSI name The name of an iSCSI path. You use an iSCSI name to identify that iSCSI path to a host.
LD Logical disk. A collection of chunklets that reside on different physical disks and that are arranged
as rows of RAID sets. When you create a CPG, the system creates and groups logical disks and
assigns those logical disks to the CPG.
legacy host
persona
A host persona that simulates the behaviors of a port persona.
LIP Loop Initialization Primitive. The protocol by which a Fibre Channel Arbitrated Loop (FC-AL)
network initializes upon power up or recovers after a failure or other unexpected condition.
During loop initialization, the nodes present on the arbitrated loop identify themselves and acquire
addresses on the loop. No data can be transferred on an arbitrated loop until initialization
completes.
logging Temporarily saving data to logging logical disks when physical disks are out of service (due to
failure or during replacement procedures).
logging LD Logging logical disk. A logical disk used for logging. During system setup, the system creates a
20 GB RAID 10 logging LD for each controller node in the system.
LUN Logical Unit Number. A number used to access a virtual volume that has been assigned to a
particular host on a particular port.
maintenance PC A laptop computer running Windows 2000 used by a field technician to initiate direct
communication with the system service processor and controller nodes.
mapping The correspondence of LD regions to virtual volume regions.
matched-set VLUN
template
A rule that allows a particular host connected to a particular port to see a virtual volume as a
specified LUN.
message code A keycode that identifies a system alert.
mirror One member of a group of mirrored chunklets, which is also known as a RAID 1 set.
mirroring A data redundancy technique used by some RAID levels and in particular RAID 1 to provide data
protection on a storage array.
navigation tree The navigation tree appears in a pane that occupies the left side of the HP3PAR Management
Console main window. Each system and system object appears as an icon in the navigation tree.
92 Glossary