[Info-vax] bound volume set limits

[Hans Bachner]

Jan-Erik Soderholm schrieb am 03.07.2017 um 23:48:
> Den 2017-07-03 kl. 19:19, skrev Baldrick:
>> [snip]
>>
>> Scenario is this, VAX VMS 7.1 with just under a terabyte and a half of
>> tape archived data of lots of relatively small files.
>> [snip]
>>
>
> Maybe I'm just missing something here...
>
>  > 30 presentations of 50 gig.
>
> Would not 15 x 100 GB, or 5 x 300 GB work?
>
> But maybe 50 GB is at some limit for the OS versions used (?).

I don't know the details, but "lots of relatively small files" might be 
the key. The maximum number of files allowed on a disk depends on the 
cluster size used:

$ HELP INITIALIZE /MAXIMUM_FILES
[...]
      Restricts the maximum number of files that the volume can
      contain. [...]

      The maximum size you can specify for any volume is as follows:

      (volume size in blocks)/(cluster factor + 1)
[...]

As increasing the volume size increases the cluster size, a bigger 
volume doesn't buy you much in terms of allowed number of files.

As the limit is applied to the individual volume set member (not to the 
volume set), more files can be placed on a volume set than on a single 
larger volume.

Hans.