[Info-vax] VMS defragmenters

[glen herrmannsfeldt]

Bob Koehler <koehler at eisner.nospam.encompasserve.org> wrote:
> In article <002d666f$0$19613$c3e8da3 at news.astraweb.com>, JF Mezei <jfmezei.spamnot at vaxination.ca> writes:
 
>> But with more recent VMS versions, wasn't there a "built-in"
>> defragmenter ? If not, what is the SET FILE/MOVE/NOMOVE used for ?
 
>   It's to control the use of the IO$_MOVE operation.  There is a
>   defragmenter from DEC/COMPAQ/HP which uses it, and I'm pretty sure
>   all the third party defgramenters were updated to use it, but none
>   of them ship with VMS.

I don't know about VMS, but IBM's MVS has an Unmovable attribute
for files, mostly for ones that have absolute disk block addresses
in them.  They at least did that for ISAM files.  

-- glen