[CentOS] Re: Shrinking a volume group

Wed Sep 13 18:33:10 UTC 2006
Morten Torstensen <morten at mortent.org>

Scott Silva wrote:
> Steve Bergman spake the following on 9/13/2006 8:21 AM:
>> OK.  Now I'm a bit confused.  Raid 1 read performance is not what I
>> expected.

md does not stripe reads in raid-1. As can be clearly seen on my raid-1 setup on 
two ide drives:

[root at balrog ~]# hdparm -t /dev/hde

/dev/hde:
  Timing buffered disk reads:  136 MB in  3.01 seconds =  45.17 MB/sec
[root at balrog ~]# hdparm -t /dev/hdg

/dev/hdg:
  Timing buffered disk reads:  126 MB in  3.03 seconds =  41.52 MB/sec
[root at balrog ~]# hdparm -t /dev/md0

/dev/md0:
  Timing buffered disk reads:  124 MB in  3.01 seconds =  41.24 MB/sec
[root at balrog ~]#


-- 

//Morten Torstensen
//Email: morten at mortent.org
//IM: Cartoon at jabber.no morten.torstensen at gmail.com

And if it turns out that there is a God, I don't believe that he is evil.
The worst that can be said is that he's an underachiever.