Sun Microsystems 2500 Master / alternate master, Media access control MAC address, Mirroring

master / alternate master

A design for reliability that uses redundant configuration. Array configurations share master/alternate master configurations: each array configuration has two controller trays that are grouped as one host. In each case, the master component uses the IP address and name. If the master fails, the alternate master assumes the IP address and name and takes over the master’s functions.

media access control (MAC) address

The physical address identifying an Ethernet controller board. The MAC address, also called an Ethernet address, is set at the factory and must be mapped to the IP address of the device.

mirroring

A form of storage – also called RAID Level 1, independent copy, and real-time copy – whereby two or more independent, identical copies of data are maintained on separate media. Typical mirroring technologies enable the cloning of data sets to provide redundancy for a storage system.

multipathing

A design for redundancy that provides at least two physical paths to a target.

N

O

out-of-band traffic

System management traffic outside of the primary data path that uses an Ethernet network. See also in-band traffic.

P

PDU

See power distribution unit (PDU).

pool

See storage pool.

power distribution unit (PDU)

The assembly that provides power management for the system. The redundant design uses two PDUs in each system so that the system’s data path continues to function if one of the PDUs fails.

102 Sun StorageTek 2500 Series Array Hardware Installation Guide • March 2007