Legacy HDS Forums

high I/O latency reported in vCenter 5.0 with AMS2000

Discussion created by Legacy HDS Forums on Mar 4, 2013
Latest reply on Mar 6, 2013 by Legacy HDS Forums

Originally posted by: Aruna


We are seeing high I/O latency spikes in our ESXi 5.0 farm from the vCenter for LUNs provisioned from an AMS2300. Attached here one sample screen of I/O latency spikes. The setup is AMS2300 <-> MDS 9124 <-> Cisco UCS 5108.

[attachment=28:Physical device command latency - Screen_1.JPG]

AMS was found to be healthy and no resource bottleneck by looking at PFM data. Cisco level also all buffers/logs are OK as per respective vendors.

Any one seen this type of behavior before ? appreciate any advice finding a resolution.

I/O latency spikes in the vCenter varies from 100ms to 1000ms range and frequent in nature. There is no association to a pattern or workload also, identified so far.

Thanks in advance.