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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
.
volume mapping
The process by which volume permissions (read only, read/write, or
none) and LUNs are assigned to a host port.
WBI
See
web-browser
interface (WBI)
See
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
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