146 Sun StorageTek 2500 Series Array Hardware Installation Guide • September 2009
host
As a function of the Sun StorageTek 2500 Series array configuration, a representation
of a data host that is mapped to initiators and volumes to create a storage domain.
See also data host, initiator.
host bus adapter (HBA)
An I/O adapter that connects a host I/O bus to a computer’s memory system.
Abbreviated HBA. Host bus adapter is the preferred term in SCSI contexts. Adapter
and NIC are the preferred terms in Fibre Channel contexts. The term NIC is used in
networking contexts such as Ethernet and token ring. See also initiator.
host group
A group of hosts with common storage characteristics that can be mapped to
volumes. See also host.
hot-spare
The drive used by a controller to replace a failed disk. See also array hot-spare.
in-band traffic
System management traffic that uses the data path between a host and a storage
device. See also out-of-band traffic.
initiator
A system component that initiates an I/O operation over a Fibre Channel (FC) or iSCSI
Ethernet network. If so configured, each host connection within the network has the
ability to initiate transactions with the storage array. Each host in the network represents
a separate initiator, so if a host is connected to the system through two host bus adapters
(HBAs) or NICs, the system identifies two different initiators (similar to multi-homed,
Ethernet-based hosts). In contrast, when multipathing is used in round-robin mode,
multiple HBAs or NICs are grouped together, and the multipathing software identifies
the group as a single initiator.
IOPS
A measure of transaction speed, representing the number of input and output
transactions per second.
iSCSI
iSCSI is an acronym for internet SCSI (Small Computer System Interface). This
storage networking standard transports block level data and SCSI commands as IP
packets over Ethernet as described in RFC 3720.
LAN
Local area network.
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