FreeNAS

First whack would be something like:

diff --git a/gui/middleware/notifier.py b/gui/middleware/notifier.py
index 1ba2ed71f..e498a35b3 100755
--- a/gui/middleware/notifier.py
+++ b/gui/middleware/notifier.py
@@ -5485,6 +5485,14 @@ class notifier(metaclass=HookMetaclass):

         return True

+    def bootenv_detach_disk(self, label, devname):
+        """Remove a disk from the bool""" 
+
+        proc = self._pipeopen("/sin/zpool detach freenas-boot %sp2" % (devname, ))
+        err = proc.communicate()[1]
+        if proc.returncode != 0:
+            raise MiddlewareError('Failed to detach disk: %s' % err)
+        
     def bootenv_replace_disk(self, label, devname):
         """Attach a new disk to the pool""" 

But I'm not sure if that's entirely right. Note that it doesn't check pool status, verify the disk is in the pool, etc.

I'd also suggest it use libzfs instead of trying to parse the output of the zfs/zpool commands, but that's just me.

Sean, is this something in your capabilities to tackle then? Not like William is running short of things to do ;)

No more than I just did -- I have no idea how it'd be tested or integrated. Not yet, anyway.