"Jeffrey J. Kosowsky" <[email protected]> wrote on 02/23/2011 10:46:54 AM:
> Are you using lvm snapshots? > It seems that some of my terribly slow recent performance has been due > to having lvm snapshots. I saw a site that claimed lvm snapshots in > practice can degrade write performance up to 20-30x... This is mostly true when your log file is on the same spindle as the LV you're snapshotting. That should be considered an absolute no-no. You get the type of performance dropoff you're talking about. LVM snapshots pretty much require a dedicated drive for the log. Or drives: if the volume you're snapshotting is a, say, 6-disk RAID array, and you give only a single drive for the log, everything gets bottlenecked by the log drive. Timothy J. Massey Out of the Box Solutions, Inc. Creative IT Solutions Made Simple! http://www.OutOfTheBoxSolutions.com [email protected] 22108 Harper Ave. St. Clair Shores, MI 48080 Office: (800)750-4OBS (4627) Cell: (586)945-8796
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