I am looking for a command which displays the I/O statistics of logical volumes (like reads/sec , writes/sec, io utilization %, read kb per second, written kb per second) .

I tried iostat, but its giving results for the whole disk.

df lists the volumes /dev/hd3, /dev/hd4 etc. I am looking for the stats for all the entries in that format.

Below is the output of df -k:

$ df -k
    Filesystem    1024-blocks      Free %Used    Iused %Iused Mounted on  
    /dev/hd4           262144     61200   77%    10305    41% /  
    /dev/hd2          2818048    813264   72%    43118    19% /usr  
    /dev/hd9var        458752    161356   65%     6140    14% /var  
    /dev/hd3           196608    194396    2%       55     1% /tmp  
    /dev/hd1            65536     65120    1%       20     1% /home  

Can you please point me to the right command?

  • 1
    Don't have an AIX system in front of me, does iostat -F or iostat -f list by filesystem (which may be enough for you, there's a one-to-one LV / FS mapping on AIX if you're not using anything odd). – EightBitTony Mar 9 '16 at 8:41
  • 1
    Or there's an lvmstat command on later versions of AIX, but you need to enable collection on a per-LV basis. man lvmstat should explain how. – EightBitTony Mar 9 '16 at 8:48
  • I think you can find similar stats in nmon as well. – KWubbufetowicz Mar 9 '16 at 20:50
  • If any of the existing answers solves your problem, please consider accepting it via the checkmark. Thank you! – Jeff Schaller Apr 23 '17 at 12:48

As EightBitTony pointed out, you're looking for the lvmstat (reference: AIX 7.1 or AIX 6.1 -- same syntax) command. You can enable statistics collection on an LV level or the whole VG level with lvmstat -l LVNAME -e (LV-level) or lvmstat -v VGNAME -e (VG-level). Enabling it at the VG level turns on collection for all of the LVs in the VG. You can then gather the stats you want with, for exampe, lvmstat -l hd3 5, to show stats for /tmp every 5 seconds. To disable the collection, use lvmstat -l LVNAME -d (LV-level) or lvmstat -v VGNAME -d (VG-level).


For iostat, you might want to consider using the -b flag to get block device utilisation measurements, but this has to be enabled first. For that see the IBM AIX Version 7.1 Differences Guide in section 6.4 - Enhancement of the iostat command:

The raso command is used to turn the statistic collection on and off. Example 6-47 shows how to use the raso command to turn on the statistic collection that the iostat command uses.

Example 6-47 Using the raso command to turn on statistic collection

# raso -o biostat=1
 Setting biostat to 1

If you need a good overview, consider running a trace using the filemon command The report it generates contains statistics on a LV level, PV level, FS level and also VMM level. It will also show "hot spots" meaning busy jfs logs, overly busy disks, LV's or VG's.

For some more examples, see e.g.

Although you need to keep in mind that this runs a trace, so it can use considerable amounts of CPU usage for a really busy system, and you shouldn't leave it running over longer time periods.

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