You might want to take a look at this:
https://www.opensfs.org/wp-content/uploads/2017/06/Wed06-CroweTom-lug17-ost_data_migration_using_ZFS.pdf
I was indeed reading that but I was a bit hesitant because the
"zpool"/"zfs" operations are bracketed by 'service lustre stop
...'/'service lustre start ...' commands which I hope to avoid.
[...] basically the same procedure to make incremental copies of mdt data when
we were attempting to switch over to a new mds server. You don't need to
unmount lustre in order to do the incremental backups.
Thanks for the confirmation, it is nice to be a bit surer that my
expectation was realistic.
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