operating set
In SAN Volume Controller, the set of nodes that are operating together to
deliver storage services.
oversubscription
The ratio of the sum of the traffic that is on the initiator N-node
connections to the traffic that is on the most heavily loaded interswitch
links (ISLs), where more than one ISL is connected in parallel between
these switches. This definition assumes a symmetrical network and a
specific workload that is applied equally from all initiators and sent
equally to all targets. See also symmetrical network.
P
partition
IBM definition: A logical division of storage on a fixed disk.
HP definition: A logical division of a container represented to the host as a
logical unit.
partner node
The other node that is in the I/O group to which this node belongs.
partnership
In Metro or Global Mirror operations, the relationship between two
clusters. In a cluster partnership, one cluster is defined as the local cluster
and the other cluster as the remote cluster.
paused
In SAN Volume Controller, the process by which the cache component
quiesces all ongoing I/O activity below the cache layer.
pend To cause to wait for an event.
petabyte (PB)
In decimal notation, 1 125 899 906 842 624 bytes.
PDU See power distribution unit.
PLUN See managed disk.
point-in-time copy
The instantaneous copy that the FlashCopy service makes of the source
virtual disk (VDisk). In some contexts, this copy is known as a T
0
copy.
port The physical entity within a host, SAN Volume Controller, or disk
controller system that performs the data communication (transmitting and
receiving) over the fibre channel.
port ID
An identifier associated with a port.
power distribution unit (PDU)
A device that distributes electrical power to multiple devices in the rack. It
typically is rack-mounted and provides circuit breakers and transient
voltage suppression.
power-on self-test
A diagnostic test that servers or computers run when they are turned on.
prepared
In a Global Mirror relationship, the state that occurs when the mapping is
ready to start. While in this state, the target virtual disk (VDisk) is offline.
176 IBM System Storage SAN Volume Controller: Hardware Installation Guide
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