John Allgood wrote:
> Hello All
>
> I sent this message to the admin list and it never got through so I
> am trying the performance list.
> We moved our application to a new machine last night. It is a Dell
> PowerEdge 6950 2X Dual Core. AMD Opteron 8214 2.2Ghz. 8GB Memory. The
> machine is running Redhat AS 4 Upd 4 and Redhat Cluster Suite. The SAN is an
> EMC SAS connected via fibre. We are using Postgres 7.4.16. We have recently
> had some major hardware issues and replaced the hardware with brand new Dell
> equipment. We expected a major performance increase over the previous being
> the old equipment was nearly three years old
> I will try and explain how things are configured. We have 10
> separate postmasters running 5 on each node. Each of the postmasters is a
> single instance of each database. Each database is separated by division and
> also we have them separate so we can restart an postmaster with needing to
> restart all databases My largest database is about 7 GB. And the others run
> anywhere from 100MB - 1.8GB.
> The other configuration was RHEL3 and Postgres 7.4.13 and Redhat
> Cluster Suite. The application seemed to run much faster on the older
> equipment.
> My thoughts on the issues are that I could be something with the OS
> tuning. Here is what my kernel.shmmax, kernel.shmall = 1073741824. Is there
> something else that I could tune in the OS. My max_connections=35 and shared
> buffers=8192 for my largest database.
>
Update to 8.x.x at least
C.