Overland Storage SnapSAN S1000 User Manual page 120

SnapSAN S1000 User Guide
Hot Spare
Used as a failover mechanism to provide reliability in system configurations. A hot spare is
active and connected as part of a working system. When a key disk fails, the hot spare disk
is switched into operation taking its place.
Hot Swap
The action of components being removed and replaced while the unit is running, with power
to either the component or a device still connected to the unit. Not all components are hot
swappable. Please read installation and maintenance instructions carefully.
IDE
Short for Integrated Drive Electronics. A standard interface for connecting storage devices to
a PC
Internet
A global network of networks used to exchange information using the TCP/IP protocol. It
allows for electronic mail and the accessing ad retrieval of information from remote sources.
Initialization
RAID 5, 6, 50, and 60 disk arrays must have consistent parity before they can be used to
protect data. Initialization writes a known pattern to all drives in the array. If you choose
not to initialize an array, the array will be trusted. Any drive failure results in data
corruption in a trusted array. (It is possible to later perform a parity rewrite that
recalculates the parity based on the current data, thus ensuring the data and parity are
consistent.)
Initiator Device
A system component that originates an I/O command over an I/O bus or network. An
initiator issues the commands; a target receives them.
An initiator normally runs on a host computer. It may be either a software driver or a
hardware plug-in card, often called a Host Bus Adapter (HBA). A software initiator uses one
of the computer's Ethernet ports for its physical connection, whereas the HBA will have its
own dedicated port.
Software initiators are readily available for most host operating systems. Hardware
initiators are not widely used, although they may be useful in very high performance
applications or if 10 Gigabit Ethernet support is required.
Internal Logical Drive
An internal logical drive is identical to a regular logical drive, except it is NOT made visible
to a host adapter as a LUN. Instead, internal logical drives are used for setting up snapshot
ODAs that are only accessed internally by the RAID controller.
IP
Short for Internet Protocol. IP specifies the format of packets and the addressing scheme.
IQN
Short for iSCSI Qualified Name. A name format used in the iSCSI protocol.
10400310-003 01/2013
©2010-13 Overland Storage, Inc.
Glossary
GL-5
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