11-23-2010
On Linux, lazy unmount denies further attempts to use the filesystem, but doesn't invalidate handles are open already, and keeps the filesystem technically mounted until the last one is closed. So if anything keeps holding that partition open, you've now got the worst of both worlds: A filesystem that can't be unmounted, can't be used, and can't be reinstated(because a lazy unmount can't be aborted). If something's persistently holding open the disk and you can't kill it, a lazy unmount will turn an annoyance into a disaster.
So this option is fairly dangerous.
You'll be able to tell when (or if!) it ever completes via df -h, I think.
If you have the necessary root permissions to unmount something, why can't you just stop samba properly?
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