21 Apr
2021
21 Apr
'21
3:32 p.m.
On 21/04/2021 22:13, Peter Coghlan via cctalk wrote:
I've just tried ANALYZE/DISK on VAXBINMAY931 which
is the oldest I can
put a hand on right now and it gives exactly the same output as you got.
Thanks ... that's reassuring. Individual savesets can be tested with
BACKUP/LIST or (more extensively) by extracting each BACKUP - that would
show up any errors.
ZIP is probably most commonly used for compressed archives on VMS.? The
version of ZIP that runs on VMS can save VMS file attributes when told
to so
that it doesn't lose important attributes for the installation kits
like tar
would. (I only came across xz anywhere for the first time about a week
ago...)
It's true that ZIP is probably the most common archiver on VMS (and I'm
sure it's on the various OpenVMS FREEWARE disks). That said, I expect
that most people making such images available for distribution (e.g.
bitsavers) are not running VMS. I'm planning to distribute an ISO plus
some extra bits, not the individual backup savesets, so attributes
shouldn't be a problem. I'd expect that anyone who wants to use this
stuff will run up SIMH and mount an ISO or possibly burn a CD-R and use
it that way. I might try zip (under Unix, so gzip) for fun, but I expect
that xz will beat it hands down for space. I guess an ISO could also be
accessed using LDDRIVER, although my main constraint back in the day was
always disk space.
I'm not going to try zip on OpenVMS because ... much as I love VMS, SIMH
on my laptop just isn't as fast as Linux on a Ryzen!
Antonio
--
Antonio Carlini
antonio at acarlini.com