Active IQ Unified Manager Discussions

Monitoring Loop Performance

jamey
3,098 Views

Can someone point me to documentation outlining how to monitor disk loop performance?  I'm currently using OM 4.0 but I don't see any objects that give me this info.

Thanks!

Jamey

4 REPLIES 4

adaikkap
3,098 Views

HI Jamey,

Are you talking about the physical loop connectivity between the head and disk shelf ?

If so we don’t discover those objects, so you won’t be able to do it.

Regards

adai

jamey
3,098 Views

Thanks for the reply Adai.  Yes, that is exactly what I am talking about.

So there is no way of monitoring this at all?  Or there is no way currently to monitor it in OM?

Thanks,

Jamey

adaikkap
3,098 Views

As Far As I Know not in OM, I am not aware of other tools.

Regards

adai

BrendonHiggins
3,098 Views

The doc

Performance Management
Monitoring And Analysis


byAkshay Bhargava
Mukesh Nigam
And a bit.. Alain Geenrits

States

Bottleneck: FC-AL Loop have throughput limitations

  • Each 2Gbit ESH loop can support up to 170-180MB/s

Symptoms:

  • High response times to requests on one or more volumes
  • Inability to add more load to one or more volumes
  • RAID reconstruction / scrub

Diagnosis: High disk utilization can indicate loop limits
Use statit to monitor disk utilization
Loop Saturation - If disk utilization is >70% but low disk tput(67 * 31.5 * 4K = 8 MB/s per disk) *and* high data transfer rates on a loop

disk ut% xfers ureads--chain-usecs writes--chain-usecs
/vol0/plex0/rg0:
0b.16 0 0.03 0.02 10.00 5250 0.01 10.00 0
0b.17 97 66.91 66.90 31.54 1774 0.01 10.00 0
0b.18 96 67.06 67.05 31.49 1552 0.01 10.00 0
0b.19 95 66.99 66.98 31.54 1472 0.01 10.00 0
0b.20 94 67.05 67.04 31.48 1453 0.01 10.00 0

You maybe able to create a customer report in OM with this method.

Hope it helps

Bren

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