dsync and altpath on shared storage.

[Peter Mogensen]

On 9/3/19 2:38 PM, Sami Ketola wrote:
> 
> 
>> On 3 Sep 2019, at 15.34, Peter Mogensen via dovecot <dovecot at dovecot.org> wrote:
>>
>>
>>
>> On 9/2/19 3:03 PM, Sami Ketola wrote:
>>>> On 2 Sep 2019, at 15.25, Peter Mogensen via dovecot <dovecot at dovecot.org> wrote:
>> ...
>>>> Is there anyway for dsync to avoid moving Gigabytes of data for could
>>>> just be "moved" by moving the mount?
>>>
>>>
>>> Not tested but you can probably do something like this in the target server:
>>>
>>> doveadm backup -u victim -R ssh sudouser at old-server "sudo doveadm dsync-server -o mail_location=sdbox:/location-to-your-sdbox/ -u victim"
>>>
>>> just leave ALT storage path from the setting.
>>
>>
>> I'll have to test this... but my initial guess would be that doveadm
>> would then think the mails has disappeared. Would it then copy the index
>> metadata for those mails to the target host anyway?
> 
> 
> Hmm. That is true. It will probably not work after all then. 
> 
> Now I'm out of ideas how to do this efficiently.

I assume it won't even work to just premount the shared storage
read-only on the target side, so the mails are already there.
... since I suppose the receiving dsync reserves the right to re-pack
the m.* storage files?

/Peter