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Re: [BackupPC-users] Really slow with rsync, even on incrementals
2011-02-23 15:10:19
"Jeffrey J. Kosowsky" <backuppc AT kosowsky DOT org>
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
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- Re: [BackupPC-users] Really slow with rsync, even on incrementals, (continued)
- Re: [BackupPC-users] Really slow with rsync, even on incrementals, Les Mikesell
- Re: [BackupPC-users] Really slow with rsync, even on incrementals, John Goerzen
- Re: [BackupPC-users] Really slow with rsync, even on incrementals, Les Mikesell
- Re: [BackupPC-users] Really slow with rsync, even on incrementals, John Goerzen
- Re: [BackupPC-users] Really slow with rsync, even on incrementals, Timothy J Massey
Re: [BackupPC-users] Really slow with rsync, even on incrementals, Jeffrey J. Kosowsky
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