Phoenix RPC12 Series, Cli Reference Manual

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Glossary 14
virtual disk For Phoenix storage systems, a set of disk drives that share a RAID
level and disk type, and across which host data is spread for
redundancy or performance.
volume A logical subdivision of a virtual disk. Multiple LUNs can be assigned
to the same volume, one for each host port given access to the volume.
See also
standard volume .
volume mapping The process by which volume permissions (read only, read/write, or
none) and LUNs are assigned to a host port.
WBI See RAIDar .
web-browser
interface (WBI) See RAIDar .
world wide name
(WWN) A unique 64-bit number assigned by a recognized naming authority
(often via block assignment to a manufacturer) that identifies a node
process or node port. (SNIA)
Phoenix storage systems derive WWNs from the serial numbers of
controller modules and expansion modules.
world wide node
name (WWNN) A globally unique 64-bit identifier assigned to each Fibre Channel node
process. (SNIA)
world wide port name
(WWPN) A globally unique 64-bit identifier assigned to each Fibre Channel port.
(SNIA)
write policy A cache-writing strategy used to control write operations. The write
policy options are CIFS write-back and write-through cache.
write-back cache A caching technique in which the completion of a write request is
signaled as soon as the data is in cache, and actual writing to non-
volatile media occurs at a later time. Write-back cache includes an
inherent risk that an application will take some action predicated on the
write completion signal, and a system failure before the data is written
to non-volatile media will cause media contents to be inconsistent with
that subsequent action. For this reason, good write-back cache