Scott Marlowe <scott.marlowe@xxxxxxxxx> wrote on 31/03/2009 15:16:01:
> On Tue, Mar 31, 2009 at 3:37 AM, <Chris.Ellis@xxxxxxxxxxxxxxxxx> wrote:
> >
> > Hi
> >
> > Been having interesting times with an IBM x3650 with 8 15k RPM 73GB drives
> > in RAID 10 and a ServRAID 8K controller with Write-Back cache enabled
> > (battery installed and working). Currently getting a pgbench score of 4.7
> > transactions per second! After playing with the postgresql configuration
> > file, I'm certain that this is not a postgresql problem. I have tried two
> > different Linux distro's upon the server both with the same problems. I'm
> > fairly certain that this is a problem with the hardware configuration /
> > setup, however I'm still waiting for IBM to contact me!
> >
> > Initially I started with the OS on a RAID 1 array and a 6 drive RAID 10
> > array for postgresql. With this setup I got 3tps, altering the RAID
> > configuration to a single 8 drive array, running both the OS and postgresql.
> > I was able to reach 700tps, however after upgrading to the latest RAID
> > controller firmware this has now fallen back to 4tps.
> >
> > Benchmarking another server I have access to, 4 15k 73GB RPM disks with a
> > Dell Perc 5/i controller. I consistently get a pgbench score of 1400tps.
> > Therefore taking a linear extrapolation I expect the IBM x3650 to manage
> > ~3000tps. Additionally my Laptop with a 5400 RPM sata disk was able to
> > score ~200tps.
>
> SNIP
>
> > What SAS RAID controllers are people using?
> >
> > What RAID configurations are people using?
> >
> > What SAS RAID controllers would anyone recommend purchasing?
>
> I am using an Areca 1680 series controller. 16 SAS 15k5 disks. 2
> RAID-1, 12 RAID-10, 2 hot spares. 512Meg bbu. RHEL 5.2 I can sustain
> around 3000 tps with pgbench and 30 minute runs.
Thanks for the Info.
>
> I'd call IBM and ask them to come pick up their boat anchors.
My sentiments exactly, unfortunately, I seem stuck with them :(
Chris Ellis
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