After getting some advice on this list (don't use ndmpcopy, use Snapmirror), I raised this as a support case with NetApp. Since someone asked me feed back any answers to toasters, here is the essence of the NetApp reply after they had made a practical test:
After doing: incremental Veritas Netbackup by ndmp of vol2 ndmpcopy /vol/vol2 /vol/vol2flex (to migrate to a flexible volume, vol2 is traditional) vol rename vol2 vol2trad vol rename vol2flex vol2
An incremental Netbackup by ndmp of vol2 now backs up all files (as a level 0).
Roger Stansfield.
Date: Tue, 20 Sep 2005 11:55:18 +0100 To: toasters@mathworks.com From: Roger Stansfield r.stansfield@rri.sari.ac.uk Subject: Incremental NDMP backup after volume migration.
I asked the following on the NOW Backup Community Forum but I haven't yet had any reply. Can anyone help, please?
I have upgraded to ONTAP 7.0.1R1. I shall use ndmpcopy to copy vol2 to a new vol2flex- there's enough space. I shall remame vol2 to vol2trad and vol2flex to vol2. vol2 contains files accessed by CIFS.
We run nightly ndmp incremental backups (Netbackup, Windows).
- Will the backup after the volume renaming be as normal (because most
file modification times are still prior to the last incremental) or will we get a backup of everything (because some archive status bit shows none of the files have been previously backed up)?
- To migrate, I may, in the event, do a level 0 ndmpcopy on a live system
followed by a level 1 ndmpcopy with the volume restricted. Does this make a difference?
- Later, I shall handle vol1 which has files accessed by both NFS and
CIFS. Will the situation be different on this volume?
- If a "level 0" backup is going to be produced, is there some way of
avoiding this or are there good reasons why we should want to get a full backup?