On Fri, 2007-01-12 at 23:16 -0600, Les Mikesell wrote: > Craig White wrote: > >>> 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? > > It will make some difference on writes, but reads should only > be done on one of the drives anyway. I doubt if it makes a huge > difference unless you have an application writing all the time. ---- here's my problem - system was ok and mother board died. Purchased a new motherboard and this is what I get... # hdparm -t /dev/md1 /dev/md1: Timing buffered disk reads: 4 MB in 3.68 seconds = 1.09 MB/sec which is dreadfully slow Thanks Craig