[Info-vax] VMS defragmenters

[Arne Vajhøj]

VAXman- @SendSpamHere.ORG wrote:
> 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.

That is what is known as a quality stamp.

Arne