[Bizgres-general] Sizing a server to host Bizgres...

[Jim C. Nasby]

On Tue, May 02, 2006 at 08:05:30AM -0700, Luke Lonergan wrote:
> Hannu,
> 
> On 5/2/06 5:47 AM, "Hannu Krosing" <hannu at skype.net> wrote:
> 
> > or maybe DMA is not enabled, what does "hdparm /dev/hda" say ?
> > 
> > modern IDE disk get usually something in between 40 and 80MB/swc
> 
> This is absolutely the problem - I never understood why RedHat kept the
> default I/O settings for ATA so pathetically bad.
> 
> You need to go to /etc/sysconfig and edit the file "harddisks" there.
> Uncomment all of the commented settings and add "-u1" to the EXTRA_PARAMS=
> line.
> 
> To have these settings take effect before reboot, issue this command:
>   hdparm /dev/had -d1 -c1 -m16 -u1
> 
> Then do a "hdparm -tT /dev/hda" to benchmark it.

I hope none of that is enabling the drive's write cache...
-- 
Jim C. Nasby, Sr. Engineering Consultant      jnasby at pervasive.com
Pervasive Software      http://pervasive.com    work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf       cell: 512-569-9461