Hi, we are currently experiencing serious performance issues on the LUNs of a couple of VMs that are connected to a Dell iSCSI SAN. Here is my scenario:
- 4 Windows Server 2012 R2 Hyper-V Hosts in a HPV Cluster connected to a Dell Powervault MD3200i using the iSCSI initiator and with the Dell MD Storage software installed.
- Inside are around 40 VMs running without any performance issues.
- Each HPV Host has 4 NICs connected to the SAN, 2 of these are also used on the Hyper-V network.
- 2 VMs are clustered and connected to the Dell Powervault using the iSCSI initiator.
- Each VM also has the Dell MD Storage software installed.
The problem is that the LUNs that are configured on these VMs work super slow. They took forever to format, they take forever to copy files, they take forever to do anything.
I already configured on the VM NIC connected to the SAN, the Jumbo Frames to 9000 according to the SAN provider that told us to configure them that way. They say the SAN is correclty configured and that the problem is related to the virtualization environment.
I even tested configuring a VM outside the Hyper-V cluster on a standalone Hyper-V Host, and that VM works perfectly fine connected to the Dell Powervault! No performance issues at all!
Any help on this matter is deeply appreciated.
Regards!