VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

314 VERITAS Volume Manager Administrator’s Guide
disk access records
Configuration records used to specify the access path to particular disks. Each disk access
record contains a name, a type, and possibly some type-specific information, which is
used by VxVM in deciding how to access and manipulate the disk that is defined by the
disk access record.
disk array
A collection of disks logically arranged into an object. Arrays tend to provide benefits
such as redundancy or improved performance. Also see disk enclosure and JBOD.
disk array serial number
This isthe serialnumber of the disk array. It is usuallyprinted onthe disk array cabinet or
can be obtainedbyissuing a vendor-specific SCSIcommandto the disks onthedisk array.
This number is used by the DMP subsystem to uniquely identify a disk array.
disk controller
In the multipathing subsystem of VxVM, the controller (host bus adapter or HBA) or disk
array connected to the host, which the Operating System represents as the parent node of
a disk.
disk enclosure
An intelligent disk array that usually has a backplane with a built-in Fibre Channel loop,
and which permits hot-swapping of disks.
disk group
A collection of disks that share a common configuration. A disk group configuration is a
set of records containing detailed information on existing VxVMobjects (such as disk and
volume attributes) andtheir relationships. Each diskgrouphas anadministrator-assigned
name and an internally defined unique ID. The root disk group (rootdg) is a special
private disk group that always exists.
disk group ID
A unique identifier used to identify a disk group.
disk ID
A universally unique identifier that is given to each disk and can be used to identify the
disk, even if it is moved.
disk media name
An alternative term for a disk name.