In my previous post, I compared what a huge difference having proper caching drives can make with vSAN OSA, replacing my read intensive disks with Intel Optane. One question remains, however: since Optane are high performance, mixed use drives, how would they get along with a vSAN ESA deployment? To find out, I reconfigured my vSAN cluster by deleting the witness VM, deploying a vSAN ESA witness, and loaded each server with 5 Intel Optane disks each. Let's see how it got along.
- ESA has compression only mode on automatically, and cannot be disabled (OSA was tested without dedupe or compression enabled)
- ESA best practices call for a minimum of three nodes. It can absolutely work with two nodes but would see true performance benefits in a right sized cluster
100% read, 4K random
- The benchmark likely kept everything in the hot tier throughout the benchmark
- As mentioned previously, ESA is running compression while OSA is not. I plan on re-running this benchmark specifically with compression only enabled on the OSA configuration.
- ESA works best at the recommended configuration (3+ nodes).
- What is the workload?
- How much performance do you need?
- Are mixed use drives going to be able to meet capacity demands?
- What's the best bang for the buck hardware to meet workload requirements?