Very similar to the thread on "change order of round-robin nsd striped writes", I'm looking for recommended practices for adding & removing NSD servers. Specifically, I've got a GPFS 220.127.116.11 cluster under Linux with 3 NSD servers. I intend to add 3~4 more servers, then eventually retire the initial 3 machines.
The NSD servers are attached to a fibre SAN, and have ethernet connections to 50+ GPFS clients which are not SAN-attached. A few machines in our environment use NFS to access data, exported via cNFS from the GPFS servers.
My concern is that the disk stanzas used by mmcrnsd, mmadddisk, etc. have an explicit server list.
Are there recommended practices for adding GPFS servers to an existing environment, including updating the server list, and recommendations for removing the older GPFS servers, all while causing the least disruption to clients of the filesystem? I would strongly prefer not to bring down the filesystems if possible.