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

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Glossary
InForm OS Version 2.2.4 3PAR InForm OS Concepts Guide
snapshot administration space
The space on a virtual volume that is used to
track changes to the data since a snapshot of a
virtual volume was created.
snapshot data
Data written to the base volume's snapshot data
space to record changes to the base volume after
the first virtual copy of that volume was created.
snapshot data space
The space on a virtual volume that holds the
data that has been changed since the first virtual
copy was created.
source volume
The virtual volume from which a copy is made.
spare status
Indicates whether a chunklet is reserved as a
spare or has been selected by the system for use
in sparing on a temporary basis.
spare, spare chunklet
A chunklet that is reserved for use in case of a
failure in the system. A certain number of
chunklets are reserved for use as spares during
the system setup and installation process.
However, the system may temporarily set aside
additional spares even though these chunklets
are not permanently designated for use as
spares.
sparing
The automatic relocation of chunklets on a
physical disk when a logging logical disk
becomes full. See also spare chunklets.
stale data
Snapshot data that is no longer valid because the
base volume did not have enough snapshot
administration and/or snapshot data space to
record new changes to that base volume.
stale snapshot
A snapshot that does not track the most recent
changes to its base volume. The No Stale
Snapshots virtual copy policy halts writing data
to the base volume so as to prevent loss of sync
between the volume and any snapshots. See also
virtual copy policy and no stale snapshots.
standard base volume
A base volume that does not allocate space on
demand, as opposed to a thinly provisioned base
volume or a commonly provisioned base volume.
See also base volume, thinly provisioned virtual
volume (TPVV), and commonly provisioned
virtual volume (CPVV).
started virtual volume
A virtual volume that either passed auto-check
upon system startup or was created since the
system was last restarted. Started virtual volumes
are ready for read/write operations.
status bar
The bar at the bottom of the InForm
Management Console main window that
contains messages and icons. Status bar
messages and icons can provide vital information
about system status, including the severity level
of the most serious new alert in the alert pane.
See also alert pane.
step size
The number of contiguous bytes that the system
accesses before moving to the next chunklet.
stopped virtual volume
A virtual volume that has not been started and is
therefore not ready for read/write operations.