On 5/18/23, 10:15 AM, "lustre-discuss on behalf of Peter Grandi via 
lustre-discuss" <lustre-discuss-boun...@lists.lustre.org 
<mailto:lustre-discuss-boun...@lists.lustre.org> on behalf of 
lustre-discuss@lists.lustre.org <mailto:lustre-discuss@lists.lustre.org>> wrote:

  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.

You only need to stop lustre if you are planning to decommission the old 
hardware and switch over entirely to the new hardware.  In that case, stopping 
lustre is needed to ensure that no new content is created on the mdt during the 
final sync.  If you are just trying to keep an on-going backup of the mdt on 
another zpool, you can just keep doing incremental snapshots and don't have to 
stop lustre (with the knowledge that your backup of the mdt data will be 
slightly old).

--Rick


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