relationship
In Metro or Global Mirror, the association between a master virtual disk
(VDisk) and an auxiliary VDisk. These VDisks also have the attributes of a
primary or secondary VDisk. See also auxiliary virtual disk, master virtual
disk, primary virtual disk, and secondary virtual disk.
reliability
The ability of a system to continue to return data even if a component
fails.
remote fabric
In Global Mirror, the storage area network (SAN) components (switches
and cables) that connect the components (nodes, hosts, and switches) of the
remote cluster.
roles Authorization is based on roles that map to the administrator and service
roles in an installation. The switch translates these roles into SAN Volume
Controller administrator and service user IDs when a connection is made
to the node for the SAN Volume Controller.
S
SAN See storage area network.
SAN Volume Controller fibre-channel port fan in
The number of hosts that can see any one SAN Volume Controller port.
SATA See Serial Advanced Technology Attachment.
schema
A group of object classes defined for and applicable to a single namespace.
Within the CIM Agent, the supported schemas are the ones that are loaded
through the managed object format (MOF).
SCSI See Small Computer Systems Interface.
SCSI back-end layer
The layer in a Small Computer Systems Interface (SCSI) network that
performs the following functions: controls access to individual disk
controller systems that are managed by the cluster; receives requests from
the virtualization layer, processes them, and sends them to managed disks;
addresses SCSI-3 commands to the disk controller systems on the storage
area network (SAN).
SCSI front-end layer
The layer in a Small Computer Systems Interface (SCSI) network that
receives I/O commands sent from hosts and provides the SCSI-3 interface
to hosts. SCSI logical unit numbers (LUNs) are mapped to virtual disks
(VDisks) in this layer as well. Thus, the layer converts SCSI read and write
commands that are addressed to LUNs into commands that are addressed
to specific VDisks.
SDD See subsystem device driver (SDD).
secondary virtual disk
In Metro or Global Mirror, the virtual disk (VDisk) in a relationship that
contains a copy of data written by the host application to the primary
VDisk.
Glossary 179
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