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Subject: Re: is there way to do "offline" mirror
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Date: Tue, 15 Dec 2015 11:06:47 +0100
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From: "Ronald Klop" <ronald-lists@klop.ws>
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On Tue, 15 Dec 2015 23:41:45 +0100, Zeus Panchenko <zeus@ibs.dn.ua> wrote:

> greetings,
>
> is there way to do "offline" mirror?
>
> what I mean:
>
> host A has zpool with mirror of two md(4) file backed,
> snapshots are made regularly
>
> host B has no network connection with host A
>
> what is the correct way to get on host B the same mirror of host A?
>
> variants I suggest:
>
> 1. regularly copy files of the zpool mirror from A to B?
>
> 2. regularly do something like:
>    on A: zfs sent snapshots@after-last-B-host-mirror-sync > diff-file
>    on B: cat diff-file | zfs receive
>
> 3. something else ...

Option 2 is nice and efficient. Need to properly administrate the  
diff-files so you don't miss anything. Bonus: you can even zfs diff the  
diff-file to see what changed.

Regards,
Ronald.