HP XP7 User Manual page 335

SSID storage subsystem ID. SSIDs are used for reporting information from the CU to the mainframe
operating system. Each group of 64 or 256 volumes requires one SSID, so there are one or four
SSIDs per CU image. The user-specified SSIDs are assigned during storage system installation
and must be unique to all connected host operating environments.
storage tiers See tiered storage.
SVP See service processor (SVP).
sync synchronize; synchronous
syslog The file on the SVP that contains information released to both the syslog and audit log files and
information released only to the syslog file.
system option Additional operational parameters for the RAID storage systems that enable the storage system
mode (SOM) to be tailored to unique customer operating requirements. SOMs are set on the service processor.
T-VOL See target volume (T-VOL).
target port A fibre-channel port that is configured to receive and process host I/Os.
target volume The volume in a Compatible FlashCopy copy pair that is the copy of the source volume (S-VOL).
(T-VOL)
See also source volume (S-VOL).
TGT target; target port
THD threshold
thin provisioning An approach to managing storage. Instead of "reserving" a fixed amount of storage, it removes
(THP) capacity from the available pool when data is actually written to disk.
THP thin provisioning
TID target ID
tiered storage A layered structure of performance levels, or tiers, that match data access requirements with the
appropriate performance tiers.
TLCU target logical control unit
total capacity The aggregate amount of storage space in a data storage system.
TRK track
unallocated An LDEV for which no host paths are assigned.
volume
V-VOL See virtual volume (V-VOL).
V-VOL Contains the pool management block and pool association information. The V-VOL management
management area area is created automatically when additional shared memory is installed.
VDEV See virtual device (VDEV).
virtual device A group of logical devices (LDEVs) in a RAID group. A VDEV typically consists of some fixed
(VDEV) volumes (FVs) and some free space. The number of fixed volumes is determined by the RAID level
and device emulation type.
virtual volume The secondary volume in a pair. When in PAIR status, the V-VOL is an up-to-date virtual copy of
(V-VOL) the primary volume (P-VOL). When in SPLIT status, the V-VOL points to data in the P-VOL and to
replaced data in the pool, maintaining the point-in-time copy of the P-VOL at the time of the split
operation.
VM volume migration; volume manager
VMA volume management area
VOL, vol volume
volser volume serial number
volume A logical device (LDEV). A mainframe volume is called a logical volume image (LVI), and an
open-systems volume is called a logical unit (LU).
volume pair See copy pair.
volume shredding Deleting the user data on a volume by overwriting all data in the volume with dummy data.
VPG virtual parity group
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