Sun Microsystems Sun Storage J4200, System Overview Manual

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90 Sun Storage J4200/J4400 Array System Overview • June 2009
control path
The route used for communication of system management information, in the case
of the J4200/J4400 Array, this is the in-band connection.
customer-replaceable unit (CRU)
An assembly component that is designed to be replaced on site by a customer,
without the array having to be returned to the manufacturer for repair; for example,
a SIM board, a power supply, a fan, a rail.
CRU
See customer-replaceable unit (CRU) .
D
data host
Any host that uses the array for storage. A data host is connected directly to the
device. See also
host .
data path
The route taken by a data packet between a data host and the storage device.
direct attached storage (DAS)
A storage architecture in which one or two hosts that access data are connected
physically to a storage array.
disk
A physical drive component that stores data.
E
event
A notification of something that happened on a device. There are many types of
events, and each type describes a separate occurrence. See also
alarm and alert .
extent
A set of contiguous blocks with consecutive logical addresses on a physical or
virtual disk.