11-29-2008
'disk' is the generic name used by the OBP to identify a disk target. Basically it just means that this is a block device that the OBP recognises as having a generic "disk" interface, it can be any type of disk, including a LUN made up of many one or many disks on external storage that makes up.
In order to allow it to be "sas" of "ssd" or "dad" or any of the other types of disk a lot more and less generic code would be required in the PROM. Disk is simply the most logical choice for the generic name for anything which looks like a disk. It is not because of / a result of show-disks they both use the same underlying code to find/map the device, they are simply using the same information so one will match the other.
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LEARN ABOUT CENTOS
mkqdisk
mkqdisk(8) Quorum Disk Management mkqdisk(8)
NAME
mkqdisk - Cluster Quorum Disk Utility
WARNING
Use of this command can cause the cluster to malfunction.
SYNOPSIS
mkqdisk [-?|-h] | [-L] | [-f label] [-c device -l label] [-d [-d ...]]
DESCRIPTION
The mkqdisk command is used to create a new quorum disk or display existing quorum disks accessible from a given cluster node.
OPTIONS
-c device -l label
Initialize a new cluster quorum disk. This will destroy all data on the given device. If a cluster is currently using that device
as a quorum disk, the entire cluster will malfunction. Do not run this on an active cluster when qdiskd is running. Only one
device on the SAN should ever have the given label; using multiple different devices is currently not supported (it is expected a
RAID array is used for quorum disk redundancy). The label can be any textual string up to 127 characters - and is therefore enough
space to hold a UUID created with uuidgen(1).
-f label
Find the cluster quorum disk with the given label and display information about it.
-L Display information on all accessible cluster quorum disks.
-d Increase debugging level. Specify multiple times for more information. Currently, specifying more than twice has no effect.
SEE ALSO
qdisk(5), qdiskd(8), uuidgen(1)
July 2006 mkqdisk(8)