[lustre-discuss] Zfs backend file system level backup

[BASDEN, ALASTAIR G.]

Hi,
I wish to perform a zfs backend file system level backup.  The Lustre 
manual says to to:
lctl set_param osd-zfs.${fsname}-${target}.index_backup=1

Does this have to be done right at the start before the file system has 
been used, or can it be done to a live file system with data already on 
it?

Thanks,
Alastair.