Here is the back brief:
I came in to two (2) NAS servers being used as a primary and backup user shares. Both are HP X1600's that were running MS Storage Server 2008. As far as I could tell there was a standalone DFS setup which was not set up to replicate to the backup server. However daily robocopies were pulled from the production to the backup box.
To meet certain security policies I have upgraded the OS of both servers to 2008 R2 Enterprise.
Since then we had permissions issues with the folders, so I did the following to initially fix the "file cannot be accessed by the system"
Took ownership of all files as the local administrators group.
Using icacls.exe i pushed a backup of the permissions back to the folders,
and then net share to reshare the folders with correct permissions. This cleared up a majority of the issues.
However we are still having intermittent access issues, there doesnt seem to be any rhym or reason but files are still unaccessable to myself (elevated user) and our share users ( are in AD security groups)
I have yet to install the MS iSCI software target or enable Multipath I/O. I turned DFS on but am not replicating and have not created a namespace. I read something about having an old DFS link still present might cause this but i could not find one anywhere in AD.
If the files are restored from backup, then they work as expected, however as this is 6TB+ of data to catch all files I would have to restore all and that is not plausible in our current setup.
To reiderate,
OS upgrade MS Storage Server 2008 -> Server 2008 R2 Enterprise.
DFS enabled but not replicating, no name space created.
All File securities are set as well as share permisions.
Administrators and share group users have issues accessing files within shares but not entire folders just random files within.
MS iSCSI Software Target and Multipath I/O not installed or configured.
Restore from backup fixes issue but would like to find the root cause.