DPDefault is legacy for traditional (volume based, DP) SnapMirror while MirrorAllSnapshots is for new version-flexible (XDP) SnapMirror. DPDefault works only because traditional DP SnapMirror by definition mirrors full volume with all its content. If you attempt to assign DPDefault to new version-flexible XDP SnapMirror (assuming this is possible, I think it is) it will only mirror AFS, but not other snapshots, because it lacks rule with all_source_snapshots label.
--- With best regards
Andrei Borzenkov Senior system engineer FTS WEMEAI RUC RU SC TMS FOS
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-----Original Message----- From: toasters-bounces@teaparty.net [mailto:toasters- bounces@teaparty.net] On Behalf Of Ehrenwald, Ian Sent: Saturday, October 15, 2016 5:59 AM To: toasters@teaparty.net Subject: SnapMirror policy clarification
Hello I'm trying to understand the differences between the snapshot policies included in cDOT 8.3, namely DPDefault and MirrorAllSnapshots. The documentation really isn't clear and apparently I can't see it myself.
The behavior I'm seeing with a DP relationship using the DPDefault policy looks like it mirrors all snapshots and the active filesystem, which the MirrorAllSnapshots policy sounds like it should do. If I delete a snapshot on the source side and do an SM update, the snapshot is gone on the destination side too.
I created a test to try and understand the differences between the policies, but maybe I'm looking at the wrong things because the results of the tests were identical:
- Created testvolA on the source and SM_testvolA on the destination
- Created testvolB on the source and SM_testvolB on the destination
- Created SnapMirror relationship between testvolA and SM_testvolA with
a SM policy of MirrorAllSnapshots
- Created SnapMirror relationship between testvolB and SM_testvolB with
a SM policy of DPDefault
- Created a snapshot on each source volume
- Initialized SnapMirror relationships
- Examined output of snap list SM_testvol*, identical
- Created another snapshot on each source volume
- Updated SnapMirror relationships
- Examined output of snap list SM_testvol*, identical
- Deleted first snapshot on each source volume
- Updated SnapMirror relationships
- Examined output of snap list SM_testvol*, identical
So, I'm having a difficult time understanding what the point of these policies are. Can someone enlighten me?
Ian Ehrenwald Hachette Book Group, Inc. This may contain confidential material. If you are not an intended recipient, please notify the sender, delete immediately, and understand that no disclosure or reliance on the information herein is permitted. Hachette Book Group may monitor email to and from our network.
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