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SAN and Disk I/O ... do we care?
Post 302454789 by newbie_01 on Monday 20th of September 2010 03:29:04 AM
09-20-2010
SAN and Disk I/O ... do we care?
Hi all,
My main function is as a DBA. Another person manages the server and the SAN.
I just want to know if I should be worried about high disk I/O or is it irrelevant as the I/O "load balancing" will be "taken care" of by the SAN?
For example, I have hdisk1-5 and I can see that there are high disk activity for hdisk1-3 but minimal on hdisk4-5, should I be concern and move database files from hdisk1-3 to hdisk4-5 and spread them around?
FYI, I can account for when hdisk1-3 are busy which is during the data load but while this is expected, I am thinking maybe it will "help the SAN" if I move out some of the database files to the filesystem where hdisk4-4 are assigned to.
Any input will be much appreciated. Thanks in advance.
My main function is as a DBA. Another person manages the server and the SAN.
I just want to know if I should be worried about high disk I/O or is it irrelevant as the I/O "load balancing" will be "taken care" of by the SAN?
For example, I have hdisk1-5 and I can see that there are high disk activity for hdisk1-3 but minimal on hdisk4-5, should I be concern and move database files from hdisk1-3 to hdisk4-5 and spread them around?
FYI, I can account for when hdisk1-3 are busy which is during the data load but while this is expected, I am thinking maybe it will "help the SAN" if I move out some of the database files to the filesystem where hdisk4-4 are assigned to.
Any input will be much appreciated. Thanks in advance.
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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)