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Full Discussion: what is SAN
Top Forums UNIX for Dummies Questions & Answers what is SAN Post 52901 by keelba on Tuesday 29th of June 2004 12:37:03 PM
Old 06-29-2004
That is exactly my point. Most people have a common definition of the terms. Just like I hear many people say something like "Do you have OpenView?" I know that they usually mean OpenView Network Node Manager but OpenView is a suite of products and Network Node Manager is but one product in that suite. People have their common terminology and use it even though it is not quite accurate.

Network Appliance makes NAS devices that connect via ethernet. However, they also sell fibre channel HBAs for their Filers to allow direct attach via SAN. Conversely, there are all kinds of SAN disk arrays out there that attach via fibre channel but you can easily buy a NAS head and connect via ethernet and call it a NAS device.

This type of stuff really confuses people and that is why I offered two definitions and said that most people refer to SANs as their fibre channel network and the arrays on it. It is not fair to say they have nothing to do with each other because they do coexist with each other.
 

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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)
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