[Info-vax] ODS-5 to ODS-2 Data Migration

[Bob Gezelter]

On Thursday, February 22, 2018 at 10:50:45 AM UTC-5, Zane Healy wrote:
> Is there a good way to determine if a directory structure contains data that
> requires an ODS-5 filesystem?  Basically I want to find what data on a disk
> requires ODS-5, and what can be moved to an ODS-2 drive.
> 
> Zane

Zane,

There are two significant differences between ODS-2 and ODS-5, bitmaps and file names.

ODS-5 supports larger bitmaps, and hence finer granularity on larger disks. It is possible that the increased amount of breakage could fill a disk and/or exhaust some user's quotas. Other than empiricism, the best way to estimate this would be to write a DCL procedure to iterate through the directory tree and compute the new file space requirements.

With regards to naming, one could similarly iterate through the directory tree and check for the presence of any extended names (e.g., names with lowercase or special characters).

A better question is: Why is it desired to revert to ODS-2?

- Bob Gezelter, http://www.rlgsc.com