RDMs and Microsoft Failover clusters
Unfortunately we have large number of virtual Microsoft failover cluster with RDM’s in virtual compatibility mode. Moving to SQL Always On is too expensive and our application owners refuse to acknowledge HA as an alternative. The issue with adding RDM’s is when you need to reboot an ESXi host it rescans for all these devices. As the amount of RDM’s increases this rescanning process can take up to an hr… Obviously waiting an hr is not acceptable so VMware created the following KB article to perennially reserve these devices. The issue I’ve experienced is when you have 100’s of RDM’s across 30-40 ESXi hosts, gathering all the devices using “esxcli storage core device list” and creating a script can be […]
