[CentOS] slow system
Craig White
craigwhite at azapple.com
Sat Jan 13 05:39:46 UTC 2007
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
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