Thu, 08 Feb 2007

2/8/2007  AIX v5.3 Links to get perfscript and instructions


Script to gather data
http://www.circle4.com/jaqui/perfdata53-latest.sh.txt


Instructions for script and nmon
http://www.circle4.com/jaqui/perf-script-instructions.txt

2/8/2007  AIX v5.3 Tunables Update


When making tunable changes please be sure to test them first.

1.  Please be careful when setting lru_file_repage.  If you are asked to change this value 
from the default (which you should) please ensure you first set maxperm and maxclient back to 80%

2.  I do want to mention that a couple of the parameters may not work well with certain workloads, specifically maxrandwrt and maxpgahead.  The situation where I saw a problem was very application specific (Topform and Providex) but try it both ways.

I normally set them for JFS and JFS2 as follows:

ioo -p -o j2_maxPageReadAhead=128
ioo -p -o maxpgahead=16
ioo -p -o j2_maxRandomWrite=32
ioo -p -o maxrandwrt=32

However, you may be better to leave them at the defaults:

ioo -p -o j2_maxPageReadAhead=128
ioo -p -o maxpgahead=8
ioo -p -o j2_maxRandomWrite=0
ioo -p -o maxrandwrt=0

	2/8/2007 General Purpose AIX v5.2 at >ML4 Tunables

Current recommended AIX v5.2 ML4 Performance Parameters:
Please ensure you test these first before implementing in production as your mileage may vary

Network
no   -p -o rfc1323=1
no   -p -o sb_max=1310720
no   -p -o tcp_sendspace=262144
no   -p -o tcp_recvspace=262144
no   -p -o udp_sendspace=65536
no   -p -o udp_recvspace=655360
nfso -p -o rfc_1323=1
nfso -p -o nfs_socketsize=600000
nfso -p -o nfs_tcp_socketsize=600000

Memory Settings

vmo -p -o minperm%=5
Leave maxperm and maxclient at default of 80
Leave strict_maxperm and strict_maxclient at their defaults

vmo -p -o minfree=960
vmo -p -o maxfree=1088
vmo -p -o lru_file_repage=0
vmo -p -o lru_poll_interval=10

IO Settings
Leave minpgahead and J2_minPageReadAhead at their defaults of 2

ioo -p -o j2_maxPageReadAhead=128
ioo -p -o maxpgahead=16
ioo -p -o j2_maxRandomWrite=32
ioo -p -o maxrandwrt=32
ioo -p -o j2_nBufferPerPagerDevice=1024

ioo -p -o hd_pbuf_cnt=1024
#### this is the 5.3 value - above is the one for 5.2
### ioo -p -o pv_min_pbuf=1024

ioo -p -o numfsbufs=2048

If doing lots of raw I/O you may want to change lvm_bufcnt
Default is 9
ioo -p -o lvm_bufcnt=12

Others left to default that you may want to tweak include:
ioo -p -o numclust=1
ioo -p -o j2_nRandomCluster=0
ioo -p -o j2_nPagesPerWriteBehindCluster=32

These are starting points only

	2/8/2007 General Purpose AIX v5.3 Tunables

Current recommended AIX v5.3 Performance Parameters:
Please ensure you test these first before implementing in production as your mileage may vary

Network
no   -p -o rfc1323=1
no   -p -o sb_max=1310720
no   -p -o tcp_sendspace=262144
no   -p -o tcp_recvspace=262144
no   -p -o udp_sendspace=65536
no   -p -o udp_recvspace=655360
nfso -p -o rfc_1323=1
nfso -p -o nfs_socketsize=600000
nfso -p -o nfs_tcp_socketsize=600000

Memory Settings

vmo -p -o minperm%=5
Leave maxperm and maxclient at default of 80
Leave strict_maxperm and strict_maxclient at their defaults

vmo -p -o minfree=960
vmo -p -o maxfree=1088
vmo -p -o lru_file_repage=0
vmo -p -o lru_poll_interval=10

IO Settings
Leave minpgahead and J2_minPageReadAhead at their defaults of 2
ioo -p -o j2_maxPageReadAhead=128
ioo -p -o maxpgahead=16
ioo -p -o j2_maxRandomWrite=32
ioo -p -o maxrandwrt=32
ioo -p -o j2_nBufferPerPagerDevice=1024
ioo -p -o pv_min_pbuf=1024
ioo -p -o numfsbufs=2048

If doing lots of raw I/O you may want to change lvm_bufcnt
Default is 9
ioo -p -o lvm_bufcnt=12

Others left to default that you may want to tweak include:
ioo -p -o numclust=1
ioo -p -o j2_nRandomCluster=0
ioo -p -o j2_nPagesPerWriteBehindCluster=32

These are starting points only