User's Manual

430 Storage Center 5.5 System Manager User Guide

Host Bus Adapter

See HBA

Initiator

A source Storage Center system that initiates replication. Data is copied from an initiator to a Target System.

Instant Replay

See Data Instant Replay.

Input/output. The process of moving data between a computer system's main memory and an external

device or interface such as a storage device, display, printer, or network connected to other computer

systems. IO is a collective term for reading, or moving data into a computer system's memory, and writing,

or moving data from a computer system's memory to another location.

iSCSI

iSCSI (Internet SCSI) is the specification that defines the encapsulation of SCSI packets over ethernet using

the TCP/IP transport protocol, or a protocol that enables transport of block data over IP networks, without

the need for a specialized network infrastructure, such as FC.

JBOD

Just a bunch of disks. An enclosure that contains storage disks, fans, and an HBA port with which it

connects to a controller.

LAN

Local Area Network

Leader Controller

In a dual controller system, the leader controller is the primary controller. Under ordinary circumstances, the

controllers share read/write duties, thus doubling IOs. In the event the peer controller fails, the lead

controller assumes the duties of both controllers. See Peer Controller.

Legacy Mode

Non-virtual port mode. in legacy mode, Fault Domains associate Primary and Reserved Front End ports to

each other as opposed to Virtual Mode where all front end ports can be part of the same fault domain.

Load Balancing

Referring to the ability to redistribute load (read/write requests) to an alternate path between server and

storage device, load balancing maintain high performance IO.