Determine if two ZFS snapshots on different machines are identical

[Johan Hendriks]

Op dinsdag 25 februari 2014 heeft Jean-Philippe Provost <
jp.provost at soccer-beauport.qc.ca> het volgende geschreven:

> Sorry, I'm new to FreeBSD but what is a "snapshot" ?
>
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> 2014-02-25 14:36 GMT-05:00 Johan Hendriks <joh.hendriks at gmail.com<javascript:_e(%7B%7D,'cvml','joh.hendriks at gmail.com');>
> >:
>
>> Op dinsdag 25 februari 2014 heeft Chris Stankevitz <
>> chrisstankevitz at gmail.com<javascript:_e(%7B%7D,'cvml','chrisstankevitz at gmail.com');>>
>> het volgende geschreven:
>>
>> > Hello,
>> >
>> > Is there a way to test whether or not two snapshots on different
>> > machines are identical?  For example, git uses a single hash to
>> > represent the state of the entire tree at any point in time.  You can
>> > compare the commit has on two independent machines to determine if the
>> > contents of the repository are identical.
>> >
>> > Thank you!
>> >
>> > CHris
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>>
>> I never  used it, but there is zfs diff.
>> # zfs diff zfsdataset at snapshot1 zfsdataset at snapshot2
>> http://docs.oracle.com/cd/E23823_01/html/819-5461/gbciq.html
>> Or google for zfs diff to find more info.
>>
>> Regards
>> Johan Hendriks
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@chris

Ok sorry i certainly did not try that. So i am sorry but i can not help you
with that.

@jean philippe

A snapshot is like a picture from your filesystem at a certain point of
time.
You can create multiple pictures and see the changes, and you can also
send, clone or return to a given picture.
Here are some blogs you can read.
They better explain it like I do :D
http://breden.org.uk/2008/05/12/home-fileserver-zfs-snapshots/
http://www.googlux.com/zfs-snapshot.html
http://zfsblog.com/2013/04/understanding-zfs-disk-usage-snapshots/

Also google for zfs snapshot example it will show you lots of examples..

Regards
Johan