[ZODB-Dev] free space for FileStorage, and possible issues with repozo (was: Missing Content)

[grahamperrin]

Michael Havard wrote:
> 
> We're missing 16 days worth of content.
> 
> Python 2.3.5, Zope 2.8.4, Plone 2.1.2, and a host of other products. ZEO
> configuration. Persistent disk caching is on.
> 
> Yesterday everything was fine. All the content was there and accessible.
> 

I recall reading about a case that involved quietly running out of free
space on the volume used for FileStorage. Something like … the most recent
content was in RAM — and the running ZEO cluster seemed to work fine with
that (no adverse effect on the end user, at the time) — but that content was
not committed to disk (and so, was probably unrecoverable following a
restart of the OS). 



> … Thinking maybe someone restored from an older backup I went out to our
> daily backups and pulled the previous days data.fs backup. A restore
> didn't work. It still shows the outdated content. 
> 

I recently had a similar experience. In Plone, using the backup script
associated with collective.recipe.backup I: 

1. restored to a less recent point in time (point A), without the desired
effect

2. restored to a more recent point in time (point B), but did not find the
content that had been created/modified between points A and B. More
specifically: I found old versions of content, without the recent
modifications. 

AFAIR the failed restoration occurred in the midst of
<http://n2.nabble.com/-tp4291640p4291640.html> using ZODB 3.8.5 (greater
than the version normally associated with Plone 3.3.3) with Zope 2.10.7
(less than the version normally associated with Plone 3.3.3).
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