Hi,
I have a Windows Server 2008R2 SP1 cluster, consisting of two VMWare virtual servers, which is experiencing very slow disk performance (~10mb/s when copying to or from any of the cluster disks). If I destroy the cluster and bring the disks online on a
standalone server I can get over 200mb/s. The disks are presented as RDMs, with the two nodes on separate ESX hosts and the disks in Physical Compatibility mode.
Could anyone explain why disk performance could become so poor as soon as the cluster is created? All the tests in the cluster validation report passed.
Not sure if this helps, but I have also noticed that when I turn maintenance on for each of the disks in Failover Cluster Manager, their performance improves dramatically.
Thanks