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