VM total disk latency

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VM total disk latency

Veeam Logoby Pat490 » Thu Jun 22, 2017 9:04 am

Since a while I do get constantly warnings from alarm "VM total disk latency" for 1 VM with "Datastore Highest Latency" in details > 200+ milliseconds

but when I check vCenter graphs I can not find those high numbers. Also in V1 Monitor virtual disks graph I do not see those number. ESXTOP is also low.

So I am wondering why the alarm is triggered?

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Pat490
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Re: VM total disk latency

Veeam Logoby Shestakov » Thu Jun 22, 2017 11:57 am

Hello Patrick,
That may be caused by performance metrics averaging. How much time past between the alarm was triggered and you checked Veeam ONE Monitor graphs? What data collection mode are you at (for typical infrastructures or for advanced ones)?
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Re: VM total disk latency

Veeam Logoby Pat490 » Thu Jun 22, 2017 1:09 pm

time between alarms varies... for example today it was 8:29, 9:18, 9:50, 10:25, 11:14, 11:49, 12:45, 14:51

screenshot in last post was from VeeamOne Monitor. Or did I missunderstand?

What data collection mode? what do you mean? Here are the alarm settings:
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Re: VM total disk latency

Veeam Logoby Shestakov » Thu Jun 22, 2017 2:35 pm

What I meant that depending on data collection mode, Veeam ONE collects 20-second samples from ESXi and shows it during the day or so(depends on the settings), then it aggregates 20-second values to 5-minutes intervals and shows the average value and so on up to 2-hour averages. These numbers are for Typical data collection mode.
According to your alarm settings, it will trigger if 15 min average Latency is higher than 75msec. If you check the performance graph a day after the alarm was triggered you may not find spikes as they are flattered.

What data collection mode? what do you mean?

I meant this setting. The one you choose during setup.
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Re: VM total disk latency

Veeam Logoby Pat490 » Thu Jun 22, 2017 5:08 pm

It should be set to typical as we have small environment with only 3 hosts.
I am looking at graphs for a few days now and never saw peaks as high as written in the alarms with 200ms or more
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Re: VM total disk latency

Veeam Logoby Shestakov » Thu Jun 22, 2017 5:24 pm

Do you observe same issue with other alarms?
I would also recommend contact support for closer investigation.
Thanks!
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Re: VM total disk latency

Veeam Logoby Pat490 » Fri Jun 23, 2017 5:19 am

rarely I get a "Datastore read latency" alarm for 1 datastore which I also can not see in vSphere graphs
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Re: VM total disk latency

Veeam Logoby Shestakov » Fri Jun 23, 2017 4:50 pm

Got it, thanks!
If you decide to contact support team, please post your case number.
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