Apple Xsan 1.0 - Manual (Page 41)

41
Glossar
y Glossary
affinity An association between a folder on an Xsan volume and one of the storage
pools that make up the volume. The affinity guarantees that files placed in the folder
are stored only on that storage pool.
allocation strategy In Xsan, the order in which data is written to the storage pools that
make up a volume. Can be fill, round robin, or balance.
balance An Xsan storage pool allocation strategy. Before allocating space on a volume
consisting of more than one storage pool, Xsan analyzes available storage on all pools
and uses the one with the most available space.
block allocation size An Xsan volume property. The smallest number of bytes that can
be reserved on, written to, or read from an Xsan volume.
client A computer that accesses data on an Xsan volume. A SAN administrator must
add the client to the SAN and mount a volume on the client before the client can
access SAN data.
controller In Xsan, short for “metadata controller.” See “metadata controller.”
failover In Xsan, the automatic process by which a standby Xsan controller becomes
the active metadata controller for a volume if the volume’s primary controller fails.
failover priority An Xsan controller property. In a SAN with more than one controller,
specifies which standby controller to try first during failover.
file system A scheme for storing data on storage devices that allows applications to
read and write files without having to deal with lower-level details. This is the term the
StorNext File System uses for an Xsan volume.
file system server See FSS.
fill An Xsan storage pool allocation strategy. In a volume consisting of more than one
storage pool, Xsan fills up the first pool before writing to the next.
format (verb) See “initialize.”
FSS File system server. The StorNext File System term for an Xsan metadata controller.
LL2652.book Page 41 Wednesday, July 28, 2004 3:45 PM