VERITAS Volume Manager 3.5 Administrator's Guide (September 2004)

Performance Monitoring and Tuning
Performance Monitoring
Chapter 12394
multiple purposes, try not to exercise any one application more than
usual. When monitoring a time-sharing system with many users, let
statistics accumulate for several hours during the normal working day.
To display volume statistics, enter the vxstat command with no
arguments. The following is a typical display of volume statistics:
OPERATIONS BLOCKS AVG TIME(ms)
TYP NAME READ WRITE READ WRITE READ WRITE
vol archive 865 807 5722 3809 32.5 24.0
vol home 2980 5287 6504 10550 37.7 221.1
vol local 49477 49230 507892 204975 28.5 33.5
vol rootvol 102906 342664 1085520 1962946 28.1 25.6
vol src 79174 23603 425472 139302 22.4 30.9
vol swapvol 22751 32364 182001 258905 25.3 323.2
Such output helps to identify volumes with an unusually large number of
operations or excessive read or write times.
To display disk statistics, use the vxstat -d command. The following is a
typical display of disk statistics:
OPERATIONS BLOCKS AVG TIME(ms)
TYP NAME READ WRITE READ WRITE READ WRITE
dm disk01 40473 174045 455898 951379 29.5 35.4
dm disk02 32668 16873 470337 351351 35.2 102.9
dm disk03 55249 60043 780779 731979 35.3 61.2
dm disk04 11909 13745 114508 128605 25.0 30.7
If the you need to move the volume named archive onto another disk, use
the following command to identify on which disks it lies:
# vxprint -tvh archive
The following is a typical display:
V NAME SETYPE STATE STATE LENGTH READPOL REFPLEX
PL NAME VOLUMEK STATE STATE LENGTH LAYOUT NCOL/WDTH MODE
SD NAME PLEX PLOFFS DISKOFFSLENGTH [COL/]OFF FLAGS
v archive fsgen ENABLED ACTIVE 20480 0 SELECT -
pl archive-01archive ENABLED ACTIVE 20480 0 CONCAT RW
sd disk03-03archive-010 409600 20480 0/0 c1t2d0