Hitachi XP P9500 User Manual page 436

CLPR(Cache Logical Partition)
A function supported by the Hitachi USP, Universal Storage Platform V/VM, Virtual
Storage Platform, and Hitachi AMS2000/AMS/WMS/SMS series for logically splitting up a
cache. This function can splits up a cache into parity groups in the storage system, so
that other parity groups do not affect the cache performance.
cluster
A system of connecting multiple hosts with the same OS or platform (essentially, an
environment in which the same application can run) and treating them as one system.
D
Dev (Device)
A logical division of an LU that HDLM controls and operates. A Dev is equivalent to a
logical volume in AIX.
In an AIX environment, each LU has only one Dev.
Each Dev has a Dev number.
Depending on the access method, Devs are classified into two types: block devices and
character devices.
(See also: Dev number)
Dev number
A number that is assigned to a device within an LU. The device numbers are assigned
sequentially from 0. A Dev number is called a logical volume number in AIX.
HDLM operates assuming that one LU has one Dev, so the device number is fixed to 0.
(See also: Dev)
E
emulation type
An LU type that is accessible from a host. Since an HDLM management-target host is an
open-system host such as a PC or a UNIX computer, the HDLM management-target
host can access only the LUs that have open-system emulation types.
For details on emulation types supported by a storage system, see the maintenance
manual for that particular storage system.
F
failback
A function for placing the status of a path recovered from an error into the Online
status, and then switching the access path to the path that was just recovered.
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