Hi Thanks for your mail.
*Some quick advice:* * * *>* *> clusternode2:~ # rpm -qa | grep postgres* *> postgresql-devel-8.1.9-1.2* *> postgresql-8.1.9-1.2* *> postgresql-docs-8.1.9-1.2* *> postgresql-server-8.1.9-1.2* *> postgresql-libs-64bit-8.1.9-1.2* *> postgresql-libs-8.1.9-1.2* *> postgresql-jdbc-8.1-12.2* *> postgresql-contrib-8.1.9-1.2* *>* *>* 8.1 is quite old. Consider upgrading as newer versions are faster. Current Postgres version is 8.4. > *> High Availability Cluster with two IBM P Series Server and* *> one DS4700 Storage* *>* *> IBM P series P52A with 2-core 2.1 Ghz POWER5+ Processor Card* *> , 36 MB L3 Cache ,16 GB of RAM,* *> 73.4 GB 10,000 RPM Ultra320 SCSI Drive for Operating System .* *>* * * *Sounds you are underpowered on cpu for 500 concurrent users.* *Of course this really depends on what they are doing.* * * *>* *> IBM SAN DS4700 Storage with Fibre Channel HDD (73.4 GB * 10)* *> Two Partitions - 73.4 GB * 3 RAID 5 - 134 GB storage* *> partitions (One holding Jakarata tomcat* *> application server and other holding Postgresql Database) .* *> Four Hard disk RAID 5 with ext3 file systems hold the pgdata on SAN .* *> Hard disk rotational speed is 73 GB 15K IBM 2 GB Fibre channel* *>* * * *A more suitable partitioning for an OLTP database would be:* * * *2 x 73.4 GB RAID 1 for App Server + Postgresql and pg_xlog* *8 x 73.4 GB RAID 10 for pgdata* * * *RAID 5 is strongly discouraged.* *- Show quoted text -* * * *>* *> Following is the output of TOP command during offpeak time.* *>* *>* *> top - 18:36:56 up 77 days, 20:33, 1 user, load average:* *> 12.99, 9.22, 10.37* *> Tasks: 142 total, 12 running, 130 sleeping, 0 stopped, 0 zombie* *> Cpu(s): 46.1%us, 1.9%sy, 0.0%ni, 6.1%id, 3.0%wa, 0.0%hi,* *> 0.1%si, 42.9%st* *> Mem: 16133676k total, 13657396k used, 2476280k free,* *> 450908k buffers* *> Swap: 14466492k total, 124k used, 14466368k free,* *> 11590056k cached* *>* *> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+* *> COMMAND* *> 22458 postgres 19 0 2473m 477m 445m R 40 3.0 0:15.49* *> postmaster* *> 22451 postgres 15 0 2442m 447m 437m S 33 2.8 0:30.44* *> postmaster* *> 22464 postgres 17 0 2443m 397m 383m R 28 2.5 0:13.78* *> postmaster* *> 22484 postgres 16 0 2448m 431m 412m S 20 2.7 0:02.73* *> postmaster* *> 22465 postgres 17 0 2440m 461m 449m R 15 2.9 0:03.52* *> postmaster* *> 22452 postgres 16 0 2450m 727m 706m R 13 4.6 0:23.46* *> postmaster* *> 22476 postgres 16 0 2437m 413m 405m S 13 2.6 0:06.11* *> postmaster* *> 22485 postgres 16 0 2439m 230m 222m R 7 1.5 0:05.72* *> postmaster* *> 22481 postgres 15 0 2436m 175m 169m S 7 1.1 0:04.44* *> postmaster* *> 22435 postgres 17 0 2438m 371m 361m R 6 2.4 1:17.92* *> postmaster* *> 22440 postgres 17 0 2445m 497m 483m R 5 3.2 1:44.50* *> postmaster* *> 22486 postgres 17 0 2432m 84m 81m R 4 0.5 0:00.76* *> postmaster* *>* * * *Are you running several Postgres clusters on this hardware?* *Please post Top output showing cmd line arguments (press 'c')* NO Only single Postgres instance > > User Access > Total Number of Users is 500 > Maximum number of Concurrent users will be 500 during peak time > Off Peak time the maximum number of concurrent user will be > around 150 to 200. > * * *A connection pooler like pgpool or pgbouncer would considerably reduce the* *burden on your system.* I am already using connection pooling in tomcat web server, so installing pgpool will help enhancing the performance ?Any changes i have to do in my application to include pgpool? Regds Shiva raman
