Hello, I have been scratching my head with the results of a report from Vrealize Operations Manager. It is listed under Performance, Summary| MAX Vm Disk Latency (ms)
There is a VM Disk Latency (95th percentile) column. Out of our 30-40 datastores, there are two used for VDI's that are in seconds. I have been unable to find a reason for this. I have looked at the flash storage array, the hosts, used esxtop, used iometer... I do see a reference in the vRealize Operations Manager manual that Datastore | Disk Command Latency shows the adjusted read and write latency on the datastore level. I did see that there was quite a bit more read IO's than write IO's.
At this point I'm wondering if it has to do with firmware/drivers/incorrect readings? Esx is at 6.5.0, on a Cisco UCS.
I appreciate any thoughts/ideas.
|Max VM Disk Latency||VM Disk Latency (95th percentile)||VMs|
The datastores listed are across four different datastore clusters across multiple arrays. The two datastores with VM Disk Latency in seconds, are the only ones on 6.5.0 and using a PureStorage all flash array. The others are 6.0.0 running on on flash arrays. Connectivity is via fiber channel. I attempted to look for correlations between the high latency and other metrics (read, write, io, etc...) and do not see one (for example backups).