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dudders
Contributor
Contributor

VM total disk latency

Hi,

i am getting some strange alerts from within VMware 6.5 and my VEEAM monitoring software for disk latency its stating a maximum disk latency of 204963825319936 ms from the Vsphere client and the VEEAM is emailing me results like below the operating system is Debian GNU/Linux 8 (64-bit) and AlienVault USM All-In-One Virtual Appliance

the windows VMs all look to be working ok, the strange thing is the datastore latency is massive but the disk latency is nowhere close?

Sample Business View Category / VMs from A to I; Datastore / RAID10; VM Network / VM Network; VMs with Snapshots / No snapshots; Last Backup Date / VMs with no backups; VM Location / No Location;

Error

Reset/resolved

VM total disk latency

15/03/2018 19:17:52

"Datastore Highest Latency" (153.0 Milliseconds) is above a defined threshold (75.0 Milliseconds)

Sample Business View Category / VMs from A to I; Datastore / RAID10; VM Network / VM Network; VMs with Snapshots / No snapshots; Last Backup Date / VMs with no backups; VM Location / No Location;

Error

Reset/resolved

VM total disk latency

15/03/2018 18:20:56

"Datastore Highest Latency" (199.0 Milliseconds) is above a defined threshold (75.0 Milliseconds)

i am also getting the same error for another machine, which is also linux

Other 3.x or later Linux (64-bit)

VirtualUSMAllInOne

AlienVault USM All-In-One Virtual Appliance

Sample Business View Category / VMs from A to I; Datastore / RAID10; VM Network / VM Network; VMs with Snapshots / No snapshots; Last Backup Date / VMs with no backups; VM Location / No Location;

Error

Reset/resolved

VM total disk latency

15/03/2018 18:17:55

"Datastore Highest Latency" (1064.0 Milliseconds) is above a defined threshold (75.0 Milliseconds)

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1 Reply
pwilk
Hot Shot
Hot Shot

Try running esxtop and compare the latency reported there with the values shown in vSphere. If these values won't match, then you might have the same situation as I had some time ago in my environment.

I had the same exact issue which I described in a ticket with VMware support. After multiple remote sessions I was told it is not anything affecting the real performance of datastores or disks and that my ticket will be forwarded to Application support (developers). This team member advised me I should try upgrading vCenter and see if this behavior stops afterward.

Let me know what you find in esxtop

Cheers, Paul Wilk
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