[Zope] backup full instances

[Andreas Jung]

--On 27. Oktober 2007 18:18:23 +0200 Jonas Meurer <jonas at freesources.org> 
wrote:

> On 27/10/2007 Andreas Jung wrote:
>>>> If you create a local copy, it is safe. If you rsync a running Data.fs,
>>>> it  is not safe. In this case you create a local copy and rsync the
>>>> copy.
>>>
>>> but if rsync is unsafe only because it takes long time, and changes on
>>> the instance during the copy process could cause a corrupted Data.fs to
>>> be backuped, then theoretically this could happen for a local copy as
>>> well, right?
>>
>> Think twice about your last sentence. What should cause a local *copy*
>> to be changed??
>
> zope might write to the Data.fs while it is copied, thus an inconsistent
> copy would be backuped, even inside one filesystem.

This is not the point. rsync will run into if the file to be synced 
changes
in-between the sync operation. This will happen with the Data.fs - it won't
happen with a static copy. An inconsistent copy of the Data.fs is not the 
problem since invalid transaction entries will be discarded by the ZODB.
So rsyncing a copy of the Data.fs it the way to go.


-aj
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