WebDAV folders internally have hundreds of copies of the same few files

[Vladislav Kurz]

On 11/14/18 2:54 PM, Ken Murchison wrote:
> 
> On 11/13/18 10:15 PM, Anatoli wrote:
>> Hi,
>>
>> I'm not sure this is due to some configuration option, bug or feature,
>> but I'm observing some folders on Cyrus HTTP WebDAV server having
>> hundreds (995 at this moment to be precise) internal files in the
>> format "NNN." that correspond to the same file but different versions
>> in time.
>>
>> There are 2-3 files (xls) in the folder that are edited constantly
>> during the day and it looks like each save operation creates a new
>> file. The files are of some 3-5Mb each. In the explorer/web view there
>> are only a couple of files with a total size of 17.5Mb, but the
>> reported disk usage for the folder is of 1.6Gb.
>>
>> Could someone please shed some light on what's going on and how to
>> make each file visible to the users to be stored in only one internal
>> file?
>>
>> Thanks,
>> Anatoli
> 
> 
> Because *DAV is layered on top of an IMAP store, we have to abide by
> IMAP semantics in which messages (in this case DAV resources) are
> immutable.  Therefore, we can NOT overwrite an existing message in the
> mailbox.  Each change MUST result in a new message.  However, the server
> does mark the previous version(s) as deleted and expunged, which means
> that they will eventually be removed by cyr_expire.  If you aren't
> running cyr_expire, you should consider adding an event to cyrus.conf to
> remove expunged messages (see -X option).

Hello,

you probably have "expunge_mode: delayed". That's why deleted mails (and
*dav files) stay in place, until cleaned by cyr_expire as mentioned above.

-- 
Best Regards
        Vladislav Kurz