1) lvmstat Command
lvmstat -v rootvg -e --> enable
lvmstat -v rootvg 5 3
lvmstat -l hd6
2) sample IO test
time dd if=/var of=/dev/null bs=1024
3) fileplace sample
# fileplace -pv nohup.out
File: nohup.out Size: 16784 bytes Vol: /dev/hd4
Blk Size: 4096 Frag Size: 4096 Nfrags: 5
Inode: 52 Mode: -rw------- Owner: root Group: system
Physical Addresses (mirror copy 1) Logical Extent
---------------------------------- ----------------
07230927 hdisk0 1 frags 4096 Bytes, 20.0% 00021423
07230933 hdisk0 1 frags 4096 Bytes, 20.0% 00021429
07276847 hdisk0 1 frags 4096 Bytes, 20.0% 00067343
07275827 hdisk0 1 frags 4096 Bytes, 20.0% 00066323
07553694 hdisk0 1 frags 4096 Bytes, 20.0% 00344190
5 frags over space of 322768 frags: space efficiency = 0.0%
5 extents out of 5 possible: sequentiality = 0.0%
4) iostat Sample
# iostat -alDRT 1
: time/xfers/read/write/queue
5) checkable Options
jfs : ioo -o numfsbufs=<#buffers>
jfs2 : ioo -o j2_nBufferPerPagerDevice=<#buffers>