at one of the customer we recently bumped with weird problem while MIGRATING from old Server 2008 to new Server 2012R2. Old Server 2008 was AD DC and simple file share server with Access Level Enumeration turned on (so users could only see those shares, which they have access to).
All shares were about 300GB in size.
In the migration process we first setup new Server 2012R2, then moved slowly all FSMO roles from old to new server.
For SHARES we decided to use DFS replication to migrate, which was probably the WORST decision in the process! And I think DFS is gulty for the main problem, despite of the fact that we turned DFS OFF few weeks ago.
- some users sometimes report, that some file on NEW server's SHARE simply is not the last saved file, which they edited last. Like, they were adding rows in some excel table every week, and if they look at the file TODAY, it has Last Modified date of 2 months ago!?
- also some users reported, that some files they created are simply missing from NEW Server's SHARE folder.
WHAT I ALREADY DID?
- 1st, I turned OFF CACHING on all shares
- 2nd, I turned OFF DFS replication for all folders
It has been more than 2 weeks now since those changes, but still files magically dissapear from time to time, or "revert back" to some older version from 2 months ago.
- I also checked for Previous Versions on NEW server, but for those particular files there's none. Only the FIRST version from upon migration.
- I checked in BACKUP, but there's again only the FIRST version of file, 2 months old
In EVENT LOGS I find nothing related....actually, I cannot find any error, only informational logs.
Don't know what to check, where to start diagnostics and how to prevent those magic to happen.