HP 3PAR T-Class Storage Systems - Manual (Page 467)

3PAR InForm Management Console 4.1.0 User’s Guide
320-200231 Rev A 467
N
No One Host policy: Use when exporting a VV to multiple hosts for use by a cluster-aware
application, or if using port presents VLUNs.
No Stale Snapshot: System can halt writing data to the base volume so as to prevent loss
of sync between the base volume and its snapshots.
no stale snapshots: Virtual copy policy that prevents changes being written to a base
volume when it does not have enough snapshot data or administration space to
prevent virtual copies from becoming invalid, or stale, as a result. See also stale
snapshots, virtual copy policy.
O
One Host policy: Constrains the export of a volume to one host or one host cluster (when
cluster names may be used as a host name.) This protects the volume from
accidental export to multiple hosts which could lead to data corruption if both hosts
are writing to the volume.
original parent base volume: The original base volume from which a series of virtual
and/or physical copies has been created. Any volume can be the parent from which
one or more virtual copies is created, but for each set of related copies there is only
one original parent base volume.
P
parent volume: A virtual volume from which a virtual or physical copy is made. See also
original parent base volume.
parity: A data redundancy technique used by some RAID levels and in particular RAID 5 to
provide data protection on a storage array.
parity set: See RAID 5 set.
parity set position: The group of chunklets that occupy the same position within a RAID 5
logical disk parity set.
physical copy: A physical copy is a snapshot that duplicates all the data from one base
volume to another base volume (the destination volume) for use, should the original
become unavailable.
physical copy, promoting: Promoting a virtual copy copies the changes from a virtual
copy back onto the base volume.
physical parent: The source volume for a physical copy.
Port availability: Creates a virtual volume that can tolerate two port failures because its
RAID sets use chunklets from devices on different cage loops.
port-presents VLUN template: A VLUN template that allows any host connected to a
particular port to see a virtual volume as a specified LUN. See also VLUN template.
primary server: In a Remote Copy setup, the storage server on which the primary volume
groups originate.
primary volume group: In Remote Copy, the set of volumes on the storage server to be
copied.