Does File.renameTo() move files smartly or does it do a dumb copy/delete?

I have to move very large files to a different folder within the same file system, in Solaris (actually a mounted NFS-based Filer - that supports NFS RENAME), instantaneously.
This is possible if the O/S level call is smart enough to leave the physical file where it is and just change the file handle information.
So... are Solaris and Java smart enough to do this automatically when we call renameTo()? Or is it using the brute force method?
If it is using the brute force method, are there any issues I need to know if I use the exec() method to spawn a Unix process to do the move? (I ask because somebody in my office thinks that Java has problems with 'hung processes' when it spawns calls to Unix commands in Solaris - I have not experience this behavior personally)
Thanks,
Bruno

I had tested, with a 100Mb file, all within a single filesystem, with the following results:
Unix 'cp' command - on Solaris w/ Filer: 2-4 seconds
Java renameTo() - on Solaris w/Filer: 4milliseconds
Java renameTo() - on Windows w/LocalDisk: 0milliseconds (or more correctly < 1)
From that it 'looks like' the renameTo() command when applied to moving a file withing a single filesystem will leave the file in place and simply change the file handle information.
I posted because I wanted to be absolutely certain. There is a fairly dumb unix script that I have no control over to moves the files from my 'destination folder' into an archive. Corruption could have happened if the file was still being physically copied by my app (as opposed to the file handles) when the other process 'found it' in the directory and tried to grab it. But since - as you indicate - renameTo() only changes the file handles... that script can't see the file until it is fully available. Much safer.
Thanks for the confirmation.
Bruno

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>
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Does File.renameTo() move files smartly or does it do a dumb copy/delete?

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