We have 3 Hyper-V hosts running 28 guests VMs on a Cluster Shared Volume on an iSCSI SAN using 3gb links. All vhd files are currently dynamic. The volume's underlying array has 16 x 10K spindles in a RAID 10. I suspect the issue is related to fragmentation and installing the PerfectDisk trial application has informed us that our CSV volume is nearly 60% fragmented. All of our VMs are experiencing performance issues. Each of our hosts have 48GB RAM and 32 processor cores.
Has anyone here had significant performance problems related to fragmentation on a CSV? If so, did installing a product and scheduling frequent defrag operations solve the problem?