VMware vRealize Operations Performance and Capacity Management

Storage contention guidance

The following table provides general guidance on storage contention. It must be read in conjunction with the CPU Contention Guidance section in Chapter 4, CPU Counters. I must emphasize that these are just guidelines—you should set the values according to the unique needs of your environment.

Object	Contention	Remarks
VM	Official SLA: Tier 1: 10 milliseconds Tier 2: 20 milliseconds Tier 3: 30 milliseconds Internal threshold: Tier 1: 5 milliseconds Tier 2: 15 milliseconds Tier 3: 20 milliseconds	The internal threshold is lower as it serves as a buffer.

Your customers only care about their own VMs, so the following numbers are for your internal targets. You should have a more stringent internal threshold. This gives ...