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