Path: utzoo!attcan!uunet!husc6!bloom-beacon!mit-eddie!ll-xn!ames!pasteur!ucbvax!CITHEX.CALTECH.EDU!carl
From: carl@CITHEX.CALTECH.EDU (Carl J Lydick)
Newsgroups: comp.os.vms
Subject: Re: MOUNT - BACKUP - DISMOUNT - MOUNT problem
Message-ID: <880521112152.1768@CitHex.Caltech.Edu>
Date: 21 May 88 18:25:12 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 11


 > Anyone experienced problems trying to mount a  tape  unit  which  had  been
 > dismounted by a process while a subprocess was backupping ?

Your problem is probably actually an "ALLOCATE-MOUNT-DISMOUNT-MOUNT" problem.
The sequence ALLOCATE-MOUNT-DISMOUNT from a subprocess results in the device
being allocated to the top-level process, and not the subprocess.  Thus
the device is "not available for mounting" when you try to mount it again.
The only workarounds I know of are:
	1)  Do the work from a top-level process; or
	2)  Don't explicitly allocate the device.