Double-Check Your HCL: VMware Removes Controllers From VSAN HCL
They say that nothing is permanent, and for this reason we have learned that architecture and best practices have to be continuously evaluated. What may have seemed like a sudden move this week by VMware is actually one that stems from a long-tested issue.
No Love for Low Queues
VMware publishes their VSAN Hardware Compatibility List (HCL) to provide a supported set of controllers and flash components for their Virtual SAN offering. This HCL ensures that the performance and reliability standards for the software defined storage product will be met, and can provide peace of mind that your production storage is safe, and speedy.
As we noted recently with the VSAN rebuild nightmare, some controllers were discovered to have much lower queue depth support which caused a bottleneck during a rebuild operation, and triggered a storage outage as a result.
VMware has gone back to the lab to re-test the controllers from the HCL and have found a few previously supported controllers which have low queue depth and are at risk of triggering the same issue.
Please visit the VMware site here to view the controllers which were removed from the HCL and ensure that as you plan your VSAN implementation that you always consult the VSAN HCL search site to be sure you have the most current supportable information.