I've not messed around with these, but they are system created policies. All policies, theoretically even system-created ones, should be able to be seen and compared with snapmirror policy show I think :)

On Fri, Oct 14, 2016 at 10:59 PM, Ehrenwald, Ian <Ian.Ehrenwald@hbgusa.com> wrote:
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.
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