I am new registered user here in this UNIX forums.
I am a new system administrator for AIX 6.1. One of our servers performs poorly every time our application (FINACLE) runs many processes/instances. (see below for topas snapshot)
I use NMON or Topas to monitor the server utilization. I checked the the CPU Idle% and the idle percent is high, however the DISK Busy% is constantly high (during real poor performance, the DISK Busy% is most of the time 100%). Also, I noticed that the FILE/TTY Readch and Writech are constantly high too. See topas snapshot below:
System Model: IBM,8205-E6B
Machine Serial Number: 0678F8P
Processor Type: PowerPC_POWER7
Processor Implementation Mode: POWER 7
Processor Version: PV_7_Compat
Number Of Processors: 6
Processor Clock Speed: 3720 MHz
CPU Type: 64-bit
Kernel Type: 64-bit
LPAR Info: 2 CARD_DB
Memory Size: 43776 MB
Good Memory Size: 43776 MB
Platform Firmware level: AL720_082
Firmware Version: IBM,AL720_082
Console Login: enable
Auto Restart: true
Full Core: false
Network Information
Host Name: CARDDB
IP Address: 10.10.10.100
Sub Netmask: 255.255.255.0
Gateway: 10.10.10.10
Name Server:
Domain Name:
Paging Space Information
Total Paging Space: 12288MB
Percent Used: 1%
Volume Groups Information
==============================================================================
rootvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk0 active 546 458 109..48..83..109..109
hdisk1 active 546 390 29..60..83..109..109
==============================================================================
oravg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk8 active 4228 68 00..00..00..00..68
==============================================================================
Everytime this happens, we try to kill processes that is CPU consuming, but still, the DISK Busy% is high. If we reboot the server, the performance becomes okay, but we can't do this during production. Any suggestion on how to optimize this? is it our architecture (having only 1 hard disk for our data)? Does bottle-necking takes place here? What can we do to optimize our server? Any upgrades shall we make? for example increasing physical memory.
Thank you very much. I hope you can help since I am not a UNIX expert.
Last edited by jim mcnamara; 02-08-2012 at 09:49 AM..
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