HP Surestore E Disk Array XP256 HP XP P9000 External Storage Access Manager Us - Page 92

Glossary, P9000 or XP Continuous Access Journal software.

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Glossary BC CLPR Cnt Ac-J Cnt Ac-S command device CTGID CU emulation mode failover fence level Fibre Channel LDKC LUN LUSE MCU OPEN-x P-VOL parity group P9000 or XP Business Copy. An HP application that provides volume-level, point-in-time copies in the disk array. Cache logical partition. P9000 or XP Continuous Access Journal software. P9000 or XP Continuous Access Synchronous software. A volume in the disk array that accepts Continuous Access, Business Copy, or P9000 for Business Continuity Manager control operations, which are then executed by the array. Consistency group ID. The group identifier used to identify a group of volumes in the HP StorageWorks P9500 Disk Array being replicated using an asynchronous technology. The consistency group feature guarantees the sequencing of updates to the secondary volumes. Control Unit. Used to organize the storage space attached to the disk controller ( DKC). You can group similarly configured logical devices (LDEVs) with unique control unit images (CUs). CUs are numbered sequentially. The disk array supports a certain number of CUs, depending on the disk array model. Each CU can manage multiple LDEVs; therefore, both the CU number and the LDEV number are required to identify an LDEV. The LDEVs associated with each RAID group are assigned an emulation mode that makes them operate like OPEN system disk drives. The emulation mode determines the size of an LDEV or volume. OPEN-V: User-defined custom size 3390-3/3R: 2.838 GB 3390-9: 8.514 GB 3390-L: 27.844 GB 3390-M: 55.689 GB 3380-3 2.377 GB The process that occurs when one device assumes the workload of a failed companion device. Failovers can be planned or unplanned. A method of setting rejection of P9000 or XP Continuous Access write I/O requests from the host according to the condition of mirroring consistency. A data transfer architecture designed for mass storage devices and other peripheral devices that require high bandwidth. Logical disk controller. Logical unit number. A LUN results from mapping a logical unit number, port ID, and LDEV ID to a RAID group. The size of the LUN is determined by the emulation mode of the LDEV and the number of LDEVs associated with the LUN. Logical Unit Size Expansion. The LUSE feature is available when the HP StorageWorks LUN Manager product is installed, and allows a LUN, normally associated with only a single LDEV, to be associated with 1 to 36 LDEVs. Essentially, LUSE makes it possible for applications to access a single large pool of storage. Main control unit. A general term describing any of the supported OPEN emulation modes (for example, OPEN-E). There are two types of OPEN-x devices: legacy OPEN-x devices with a fixed size (such as OPEN-3, OPEN-8, OPEN-9, and OPEN-E), and OPEN-V, which has a variable size and is a CVS-based volume. Primary volume. A set of hard disk drives that have the same capacity and that are treated as one group. A parity group contains both user data and parity information, which enables user data to be accessed if one or more drives in the group is not available. 92 Glossary

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Glossary
BC
P9000 or XP Business Copy. An HP application that provides volume-level, point-in-time copies
in the disk array.
CLPR
Cache logical partition.
Cnt Ac-J
P9000 or XP Continuous Access Journal software.
Cnt Ac-S
P9000 or XP Continuous Access Synchronous software.
command device
A volume in the disk array that accepts Continuous Access, Business Copy, or P9000 for Business
Continuity Manager control operations, which are then executed by the array.
CTGID
Consistency group ID. The group identifier used to identify a group of volumes in the HP
StorageWorks P9500 Disk Array being replicated using an asynchronous technology. The
consistency group feature guarantees the sequencing of updates to the secondary volumes.
CU
Control Unit. Used to organize the storage space attached to the disk controller ( DKC). You can
group similarly configured logical devices (LDEVs) with unique control unit images (CUs). CUs
are numbered sequentially. The disk array supports a certain number of CUs, depending on the
disk array model. Each CU can manage multiple LDEVs; therefore, both the CU number and the
LDEV number are required to identify an LDEV.
emulation mode
The LDEVs associated with each RAID group are assigned an emulation mode that makes them
operate like OPEN system disk drives. The emulation mode determines the size of an LDEV or
volume.
OPEN-V: User-defined custom size
3390-3/3R: 2.838 GB
3390-9: 8.514 GB
3390-L: 27.844 GB
3390-M: 55.689 GB
3380-3 2.377 GB
failover
The process that occurs when one device assumes the workload of a failed companion device.
Failovers can be planned or unplanned.
fence level
A method of setting rejection of P9000 or XP Continuous Access write I/O requests from the host
according to the condition of mirroring consistency.
Fibre Channel
A data transfer architecture designed for mass storage devices and other peripheral devices that
require high bandwidth.
LDKC
Logical disk controller.
LUN
Logical unit number. A LUN results from mapping a logical unit number, port ID, and LDEV ID to
a RAID group. The size of the LUN is determined by the emulation mode of the LDEV and the
number of LDEVs associated with the LUN.
LUSE
Logical Unit Size Expansion. The LUSE feature is available when the HP StorageWorks LUN
Manager product is installed, and allows a LUN, normally associated with only a single LDEV,
to be associated with 1 to 36 LDEVs. Essentially, LUSE makes it possible for applications to access
a single large pool of storage.
MCU
Main control unit.
OPEN-
x
A general term describing any of the supported OPEN emulation modes (for example, OPEN-E).
There are two types of OPEN-x devices: legacy OPEN-x devices with a fixed size (such as OPEN-3,
OPEN-8, OPEN-9, and OPEN-E), and OPEN-V, which has a variable size and is a CVS-based
volume.
P-VOL
Primary volume.
parity group
A set of hard disk drives that have the same capacity and that are treated as one group. A parity
group contains both user data and parity information, which enables user data to be accessed
if one or more drives in the group is not available.
92
Glossary