8x00 family of Disk Arrays 4.01.00 installation and reference guide (AA-RW7SP-TE, September 2010)

• Available — Path is currently available, but not used for device access. The

path is only in this state when no load balancing policy has been selected

for the LUN.

• Standby — Intermediate state of the path before it is initialized (made ready

for device access), normally will not be seen.

• Failed — Path is currently unusable for the I/O stream.

port A The relative number of an HBA. A specific port number is determined according

to its order of discovery by the Windows operating system. HBA's include SCSI,

Fibre Channel, and IDE adapter types.

SAN Storage Area Network. A configuration of networked devices for storage.

state An attribute that describes the current operational condition of an object. The

possible states include:

• Good: The multipathing device can be accessed on at least one path.

• Degraded: One or more paths are failed to the storage unit.

target The definition of target depends on the environment:

• For parallel SCSI configurations, the target is the actual target number as-

signed to a device.

• For Fibre Channel configurations, a target number is assigned by a mapping

function at the miniport-driver level and is derived from AL_PA (Arbitrated

Loop Physical Addresses) in an FC-AL topology.

• For SAN switched fabric, a target is assigned to a WWPN. This target can

have values between 16 and 125.

• For a fabric topology, target is a mapping function derived from the order

of discovery according to port connections at the SAN (Storage Area Network)

switch.

topology An interconnection scheme that allows multiple servers and storage devices to

communicate. Arbitrated loop and switched fabric are examples of Fibre Channel

topologies.

Glossary50