Re: RAID 5 performance problems

[Jonathan Vardy]

> On Thu, 2003-04-03 at 17:45, Jonathan Vardy wrote:
> > I'm having trouble with getting the right performance out of my software
> > raid 5 system. I've installed Red Hat 9.0 with kernel 2.4.20 compiled
> > myself to match my harware (had the same problem with the default
> > kernel). When I test the raid device's speed using 'hdparm -Tt /dev/hdx'
> > I get this:
> > /dev/md0:
> > Timing buffer-cache reads:   128 MB in  1.14 seconds =112.28 MB/sec
> > Timing buffered disk reads:  64 MB in  2.39 seconds = 26.78 MB/sec
>
> Well, if I'm not wrong, you're testing physical, individual drives, not
> the RAID5, combined, logical volume. So, your values are pretty normal.

/dev/md0 is the raid device and as you can see from the bonny++ results in
my original mail the, performance is not really normal.