One of the benefits of NetApp clustered OnTap is non-disruptive operation. The key to efficiency and the lynchpin of clustering is the ability to make sure that the cluster does not fail—ever. The nondisruptive collection of independent nodes working together and presented as one holistic solution—is the ability of data to move freely within the boundaries of the cluster.
To prove that, I did a XenDesktop PVS write cache volume move from one node to the other while the virtual desktops are up and running. WriteCache volume is moved from node 1 to node 4.
For Mid-Range (these were FAS3040 controllers) rates ranged between 150- 250MB/s. For High-End ( these were FAS6070/80 controllers) rates ranged between 250-350MB/s.
After 52 minutes, the job is finished. The used data in that volume is .82TB and the total size is 2TB. Now writecache1 volume is on node 4. All the VMs are still up and running. No operation is disrupted.
Clustered OnTap non-disruptive operation is great for upgrade, and load balance. You can easily moving data from one cluster node to another without any down time.