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).

1. 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)?

2. 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?

3. Later, I shall handle vol1 which has files accessed by both NFS and

CIFS. Will the situation be different on this volume?

4. 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?