I have a cluster of 4 Xenserver 6.2 servers, as well as one independent XenServer for a customer which have are attached to a very questionable (meaning that the drive hot-swapping causes it to break) SAN (Drobo B1200i). We are building a whole new pool of XenServers with a QNAP as the main SR, in addition to local attached storage in an adjoining rack. I have been contemplating the best way to go about this move of data, most should be easy using Xackup pool-to-pool transfer tool, however there are 2 very large disks. One of them is our shared Web Server, this server is about 700-800 gb, this is on the cluster. The other is a customer windows web server on a standalone XenServer and that VM is around 400GB, both have a virtual allocation of 2000gb.
What would be the best way to go about moving these without taking them offline for a significant amount of time? The customer server is not moving from it's hardware, just the SR.