[Info-vax] OpenVMS - file selection abnormally with Copy / Rename or user ignorance?

[Michael Moroney]

JF Mezei <jfmezei.spamnot at vaxination.ca> writes:

>On 15-03-28 08:28, Stephen Hoffman wrote:

>> FWIW, BACKUP /IGNORE=INTERLOCK — if that's what you are using — does 
>> not reliably report collisions 

>Is this because backup only checks for conflict when it starts to backup
>a file , but wouldn't issue a warning about file being opened if the
>other process opens it after backup has begun to access the file ?

>Or are there other scenarios where backup doesn't report potential
>problem because the file is opened by another process ?

It bypasses the usual VMS file locking mechanism so that the contents
BACKUP gets may not be consistent as a writer may be asynchronously 
writing or changing data.