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Homework and Emergencies Emergency UNIX and Linux Support AIX : Create LV with poor man stripe Post 302418017 by bakunin on Sunday 2nd of May 2010 12:08:35 PM
Old 05-02-2010
You say you are using LUNs out of a SAN: in this case it is irrelevant if you employ some striping algorithm in creating LVs or not. The SAN will distribute your disk accesses physically to several disks anyway.

Quite contrary, you could (very unlikely, but the possibility is non-zero) run into problems trying to stripe yourself when using an already striped medium: because of "Moiré"-like (interference) effects the diverse levels of striping could cancel out one another and change your pattern of disk access to the adverse.

I hope this helps.

bakunin
 

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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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