FreeLists / dokuwiki / [dokuwiki] Avoid problems using pagedata on an NFS volume

[Oliver Geisen <oliver.geisen@xxxxxxxxxxxx>]

Hello,

a few weeks ago i wrote about my problems with not upgrading (re- 
parsed) pages, if pagedata-dir (dokuwiki page files) resides on an  
NFS shared volume (not on the same host as the dokuwiki app runs).
This is because NFS servers create and modifiy the files in their  
local filesystem, not the client. Therefore it's vital to sync their  
clocks using the same NTP-server.
To detect such problems dokuwiki could test it like that:
  - touch a file in the root of pagedata (e.g. ".timetest")
  - check if the files mdate differs (in respect with a tolerated  
timeshift) from the local clock.
Avoiding such problems seems possible, but "expensive". One must  
touch a file, detect a differ and keep that differ as an timeoffset  
(negative or positive) which will be added to the local time each  
time a chache-operation (or other time relevant operation) will be done.

Oliver Geisen

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