Hello,
I have to move the root aggregate on a cluster node to different disks, and I have a couple questions for anyone who's done this before.
Background: we have a 4-node AFF cluster where support is ending on two nodes on 1/31. We are going to migrate all volumes to the remaining 2 nodes and move the shelves over after depopulating them. There is currently one shelf per node, all the same size, except for a single tiny additional shelf attached to the nodes we are depopulating. I'm going to use this as my "lifeboat" to move the root aggregate to from the first shelf I depopulate so the node continues to function after removing the shelf. We are running OnTAP 9.5P14.
My plan is to run the "system node migrate-root" command, however I can't find documentation indicating how this process works. At what point is there a reboot? How long does the process take? Does anyone have insight into this?
Also, I would like to use the minimal amount of disks, as I may need the rest of this small shelf to provide buffer space during later migrations, so I am hoping to only use three disks in the disklist parameter. Does anyone know if that will work in OnTAP 9.5? Do I have to use 5 disks? We're going to decom the shelf after this is all over so I'm not concerned with long-term.
If there's some way to partition the shelf and migrate the aggregate from an ADP to an ADP configuration, that would be even better. Would love to hear any suggestions or comments!