[Info-vax] VMS defragmenters

[VAXman- at SendSpamHere.ORG]

In article <839794ed-fde3-41a1-8d10-39a0136e589f at z14g2000yqa.googlegroups.com>, etmsreec at yahoo.co.uk writes:
>On 14 Apr, 20:39, JF Mezei <jfmezei.spam... at vaxination.ca> wrote:
>> This is worth its own topic.
>>
>> There was a fragmentation analyser on a decus tape last millenia.
>>
>> And there has been COPY/CONTIGUOUS for many eons which allowed
>> individual files to be defragmented.
>>
>> But with more recent VMS versions, wasn't there a "built-in"
>> defragmenter ? If not, what is the SET FILE/MOVE/NOMOVE used for ?
>
>SET FILE/NOMOVE is there so that defragmentation tools (of which there
>are a number - 2 that I know of) don't try to move the file in
>question.
>The HP Defragmentation tool (Disk File Optimiser) requires you to make
>sure that you've set the right files to NOMOVE and won't run unless
>you say "Yes" to the question of whether you've run the command
>procedure that goes round and puts the right flag on all of the files
>it's interested in.  the awkward thing for a running system is that
>some of the files that it tries to set NOMOVE on won't allow you to if
>you're booted from that disk.  Go figure.
>
>PerfectDisk is still about, though Ultradisk has not and, reportedly,
>will not be ported to VMS on Integrity.  This means that whichever
>defrag tool you're looking at is likely to need you to shut down any
>applications on the disk that you're defragging.  Not great for a
>production environment but it's safest I guess.

I don't understand this decision but I don't own their software; I only
maintain it.

-- 
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