[CentOS] slow system

Craig White craigwhite at azapple.com
Sat Jan 13 04:40:31 UTC 2007


On Fri, 2007-01-12 at 22:31 -0600, Les Mikesell wrote:
> Craig White wrote:
> > I have a server that is running slowly and I think it's because of my
> > stupidity - it's running CentOS 3.8
> > 
> > I have software RAID level 1 and the mirrored drives are the master &
> > slave on the primary controller and I'm thinking that is my mistake.
> > 
> > Is there a simple method for changing the configuration of md before I
> > switch the slave drive to be the slave on the secondary controller?
> > 
> 
> I think they will pair up automatically if you shut down cleanly
> and move the connector.  If not, just 'mdadm --add' it back after
> it comes up with a missing member.  If you have to add it back,
> the drives will have to resync so there is a small risk of
> failure during the process.
----
great thanks - am I right in thinking that having both mirrored drives
on the same controller master/slave is likely a cause of slowness?

i.e.

# mdadm --query --detail /dev/md1
/dev/md1:
        Version : 00.90.00
  Creation Time : Tue Feb  1 04:10:32 2005
     Raid Level : raid1
     Array Size : 2096384 (2047.25 MiB 2146.70 MB)
    Device Size : 2096384 (2047.25 MiB 2146.70 MB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Sat Jan 13 13:53:23 2007
          State : dirty, no-errors
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0


    Number   Major   Minor   RaidDevice State
       0       3        6        0      active sync   /dev/hda6
       1       3       70        1      active sync   /dev/hdb6
           UUID : ff9049f4:29e82010:e70acb45:690a1ad5
         Events : 0.46

Craig




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