Re: MySQL Performance Woody Vs Sarge
On Tue, 31 May 2005 13:58:41 +1200
Simon <dev@networker.co.nz> wrote:
> Jacob S wrote:
>
> > What does 'hdparm' return for the RAID drive on each server when you
> > don't give it any options (ie. 'hdparm /dev/hda')? You might also
> > include the same output for hdparm run each of the hard drives used
> > to make the array.
> >
> > What are the specs on the hard drives/RAID setup on both servers?
> > Are they hardware raid or software raid?
>
> Both software RAID 0, both use Promise 2 channel PCI cards, Hard
> Drives are IBM deskstar(?) 7200 40GB.
>
> live: # hdparm /dev/md0
^^^^^
Woody
faster
> /dev/md0:
> readonly = 0 (off)
> readahead = 256 (on)
> geometry = 25248/2/4, sectors = 80418048, start = 0
>
> dev: hdparm /dev/md0
^^^^
Sarge
slower
> /dev/md0:
> BLKROGET failed: Invalid argument
> geometry = 23632/2/4, sectors = 80405120, start = 0
[Cc'ed back to the debian-user list, as I'm sure there are people that
know more about this than I do. :-)]
What is the kernel version on each server? Are they both using the same
kernel module for the Promise controller? I'm getting the two boxes
confused... let me know if my notes above are correct.
The md0 devices should consist of two /dev/hd* devices. Please show
hdparm output for them as well.
I'm grasping at straws a little bit, as the results aren't what I first
expected (unless I'm mixing previous facts about the servers). But maybe
somebody else here will have some more clues.
HTH,
Jacob
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