January 13, 2014 at 7:09 am
Hi there,
I have a Windows 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.
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....
Thanks,
Matt
January 13, 2014 at 8:39 am
Are these presented as Raw Device Mappings to the host server?
Are the cluster nodes on the same host?
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"Ya can't make an omelette without breaking just a few eggs" 😉
January 13, 2014 at 8:46 am
Perry Whittle (1/13/2014)
Are these presented as Raw Device Mappings to the host server?Are the cluster nodes on the same host?
Hi Perry,
Thanks for responding - yes the disks are presented as RDMs. There are two nodes on separate ESX hosts and the disks are in Physical Compatibility mode.
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.
Matt
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