Newsgroups: bit.listserv.vfort-l
Date:         Thu, 13 Aug 1992 21:47:28 EST
From:         Jim Jones <JIMJ@JHUVM.BITNET>
Subject:      Manually forwarded note

 This note was rejected by the loop detection code in LISTSERV since
 there are headers pointing to the list in the body of the mail.  If
 you want to forward something like this back, make sure to munge the
 headers a bit first.  Prepending each line with '*' is sufficient...

 -jj

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*Date:	Thu, 13 Aug 1992 13:48:19 -0400
*From:	uunet.UU.NET!voder!nsc!berlioz.nsc.com!dougbell@aplcen.uucp (Doug Bell)
*Message-Id: <9208131748.AA01286@berlioz.nsc.com>
*To:	all-cda@berlioz.nsc.com, vfort-l@jhuvm.hcf.jhu.edu
*Subject: Fortran CMS files
*
*Hi,
*Files opened as new may/will not exist after failure on CMS.
*Files closed are not actually closed until epilogue processing.
*For checkpoint purposes, pre-allocate a DA file. This gets you 1) existing
*file, 2) unblocked i/o (minimum buffer flush loss), and 3) observable post
*processing records pretty much no matter what (soft) fail happens.
*Doug Bell
*
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*Date:         Wed, 5 Aug 1992 11:26:18 BST
*Reply-To: VS-Fortran discussion list <VFORT-L%JHUVM.BITNET@pucc.Princeton.EDU>
*Sender: VS-Fortran discussion list <VFORT-L%JHUVM.BITNET@pucc.Princeton.EDU>
*From: John Gordon <JCG@IBM-B.RUTHERFORD.AC.UK>
*Subject:      Closing files in CMS
*To: Multiple recipients of list VFORT-L
* <VFORT-L%JHUVM.BITNET@pucc.Princeton.EDU>
*Status: R
*
*I wonder if anyone can offer me advice on a problem we have observed
*with VM Fortran in CMS.
*
*A long-running user program opens a dataset to write and writes slowly
*throughout the job. At regular intervals throughout the job the user
*writes re-start files to enable him to continue should the job fail.
*The restart files are opened, written and then closed. So far, so good.
*If the job completes normally then the restart files are found as expected.
*If, however, the job terminates abnormally (eg) due to a VM IPL or
*system crash. There is no sign of the restart files. Since this is exactly
*the case when the restart files are needed, this is not good.
*
*Further investigation revealed that CMS does not write an updated copy
*of the minidisk directory on to disk while there are still files open.
*This means that closing a dataset in Fortran is not sufficient to actually
*create the dataset.
*
*Has anyone got any ideas for a solution. I thought I would ask this list
*before throwing it open to more general CMS lists.
*
*John Gordon
*
*
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*
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