[Lustre-discuss] Removing an OST from the filesystem

[Christopher J. Walker]

In the Lustre manual 4.2.10.1 "Removing an OST from the File System", it 
  tells you to how to deactivate the OSC on the MDT so no files are 
written to the OST, then says:

3 Use "lfs find" to discover all files that have objects residing on the 
deactivated OST.

4 Copy (not move) the files to a new directory in the file system.
Copying the files forces object re-creation on the active OSTs

5 Move (not copy) the files back to their original directory on in the 
file system.
Moving the files causes the original files to be deleted, as the copies 
replace them.

I can't convince myself there isn't a race condition here if a file is 
being written to during this process.

What happens if a file is being written to when I mark the OST offline, 
and continues to be written to during the copy and move?

Chris