Hi,
Let me describe the scenario.
Hyper-V 3 node Cluster: 3 x IBM X3650 M4
Shared storage (CSV): iSCSI - Multiplath IBM Storwize v3700
Hyper-v Node 1 is the owner of the CSV where the vhdx resides and where file server in running.
File Server Windows 2008 R2 up to date, with two VHDx attached on the same virtual controller IDE0. One for SYSTEM 40GB and second one for DATA 3TB.
We noticed that our file server VM was performing badly when copying files so we began investigating and after reinstalling S.O. (Windows 2008 R2) and bringing back to production the performance didn't get better. We copied the same 7Gb file from the data VHDX to the system VHDX, it took about 10min, giving a 100Mbps rate transfer within two disks :-(
Now that we have two copies of the same file, one in the SYSTEM VHDX and the other one in the DATA VHDX we have transferred it to the same physical machine, a windows 2012:
IMAGE FILE size 7Gb being copied from the file server SYSTEM VHDX to physical machine:
IMAGE FILE size 7Gb being copied from the file server DATA VHDX to a physical machine:
Both copies where taken when the file server activity was low.
So it looks that is related to virtual hard disk access but I have no clue on how to address this.
Many thanks,