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. Thanks
