lun stats queue_depth_lun counter

bsti — Thu, 05 Jun 2025 06:54:19 GMT

Hello,

One of the counters returned by a "stats show lun" is "queue_depth_lun". The description would lead me to believe it's exactly what it claims it is: The queue depth of the LUN. However, the data it returns doesn't make any sense. In my case, it returns a very high number (in the hundres of millions). My belief is that this is a raw statistic, and needs to have it's previous value subtracted from it to get it's real value. Despite doing this, the value still doesn't make any sense. For instance, I get these values:

(These are the actual values returned by the "stats" command:)

minute 1: 1593764771
minute 2:1593767935
minute 3:1593771165

minute 4:1593818855
minute 5:1593876652
minute 6:1593937485

(These are "delta" values I get when I subtract the raw value from the previous minute's raw value)

minute 1: 3176.0000
minute 2: 3164.0000
minute 3: 3230.0000
minute 4: 47690.0000
minute 5: 57797.0000
minute 6: 60833.0000

The odd thing is the first 3 data points are from when I'm running heavy I/O testing to the LUN, and the second 3 are when it's idle. Clearly, it doesn't make sense for the queue depth to be higher when idle.

Can anyone tell me if there is another place I should be looking to get queue depth for a LUN? If not, is this the correct counter? If so, what am I doing wrong?

I'm running ONTAP 8.0.1P2 on a new HA pair of 6280s.

Thanks!

lun stats queue_depth_lun counter

hains — Tue, 05 Jul 2011 18:53:14 GMT

Hello,

You can get LUN "Queue Length" using this command :

lun stats -o -i 1 -c 1

-o = Extra stats

-i = Interval

-c = Count

Read Write Other QFull Read Write Average Queue Partner Lun

Ops Ops Ops kB kB Latency Length Ops kB

Jay

lun stats queue_depth_lun counter

bsti — Tue, 05 Jul 2011 21:43:58 GMT

Thanks for the reply. That will have to do. I wish the "stats" command returned a usable number though.

topic lun stats queue_depth_lun counter in ONTAP Discussions

lun stats queue_depth_lun counter

lun stats queue_depth_lun counter

lun stats queue_depth_lun counter