3PAR InForm® OS 2.2.4 Concepts Guide (320-200085 Rev B, March 2009)

GL 15
Glossary
InForm OS Version 2.2.4 3PAR InForm OS Concepts Guide
VV template
Virtual volume template. The template contains
a set of virtual volume parameters that can be
applied again and again to create volumes with
the same characteristics using the InForm
Management Console.
W
World-Wide Name (WWN)
A unique 64-bit value used to identify Fibre
channel devices on an arbitrated loop. The WWN
consists of a prefix issued by the IEEE to uniquely
identify the company and a suffix that is issued
by the company.
write-through mode
A caching technique in which the completion of
a write request is not signaled until data is safely
stored. Write performance with a write-through
cache is approximately that of a non-cached
system, but if the data written is also held in
cache, subsequent read performance may be
dramatically improved.
WWN
See World-Wide Name.
Z
zero fill
To fill unused storage space with the
representation of the character denoting “0”.
zone
A unit of physical disk space reserved by a
controller node for snapshot or snapshot
administration data. A single zone may occupy
space on more than one disk.