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Re: H800 + md1200 Performance problem

From: Cesar Martin <cmartinp(at)gmail(dot)com>
To: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: H800 + md1200 Performance problem
Date: 2012-04-03 15:51:59
Message-ID: CAMAsR=4vhMgyvjuM_1NOcND0WeqrHL5J-Bxeur0ML+KTnLzc5A@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
OK Scott. I go to change this kernel parameter and will repeat the tests.
Tanks!

El 3 de abril de 2012 17:34, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>escribió:

> On Tue, Apr 3, 2012 at 9:32 AM, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
> wrote:
> > On Tue, Apr 3, 2012 at 6:20 AM, Cesar Martin <cmartinp(at)gmail(dot)com> wrote:
> >> Hello there,
> >>
> >> I am having performance problem with new DELL server. Actually I have
> this
> >> two servers
> >>
> >> Server A (old - production)
> >> -----------------
> >> 2xCPU Six-Core AMD Opteron 2439 SE
> >> 64GB RAM
> >> Raid controller Perc6 512MB cache NV
> >>   - 2 HD 146GB SAS 15Krpm RAID1 (SO Centos 5.4 y pg_xlog) (XFS no
> barriers)
> >>   - 6 HD 300GB SAS 15Krpm RAID10 (DB Postgres 8.3.9) (XFS no barriers)
> >>
> >> Server B (new)
> >> ------------------
> >> 2xCPU 16 Core AMD Opteron 6282 SE
> >> 64GB RAM
> >> Raid controller H700 1GB cache NV
> >>   - 2HD 74GB SAS 15Krpm RAID1 stripe 16k (SO Centos 6.2)
> >>   - 4HD 146GB SAS 15Krpm RAID10 stripe 16k XFS (pg_xlog) (ext4 bs 4096,
> no
> >> barriers)
> >> Raid controller H800 1GB cache nv
> >>   - MD1200 12HD 300GB SAS 15Krpm RAID10 stripe 256k (DB Postgres 8.3.18)
> >> (ext4 bs 4096, stride 64, stripe-width 384, no barriers)
> >>
> >> Postgres DB is the same in both servers. This DB has 170GB size with
> some
> >> tables partitioned by date with a trigger. In both shared_buffers,
> >> checkpoint_segments... settings are similar because RAM is similar.
> >>
> >> I supposed that, new server had to be faster than old, because have more
> >> disk in RAID10 and two RAID controllers with more cache memory, but
> really
> >> I'm not obtaining the expected results
> >
> > What does
> >
> > sysctl -n vm.zone_reclaim_mode
> >
> > say?  If it says 1, change it to 0:
> >
> > sysctl -w zone_reclaim_mode=0
>
> That should be:
>
> sysctl -w vm.zone_reclaim_mode=0
>



-- 
César Martín Pérez
cmartinp(at)gmail(dot)com

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