[Info-vax] bound volume set limits

[Jan-Erik Soderholm]

Den 2017-07-03 kl. 19:19, skrev Baldrick:
> OK i know the ice is thin, very thin...
> 
> For modern uses and modern versions of VMS bound volume sets are to be avoided.
> This is headache central and some. So don't try this in production, or
> even at home. In an ideal world I'd have a single 2 TB disk with all my files,
> but I can't go there. 7.2 is out of the question for the VAX.
> 
> 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. We're quite used
> to a number of bound volume sets, of 3 to 10 members and we back them up
> fine, restore, etc. so despite the odds, with care, they work in our
> circumstances.
> 
> So I ask the SAN engineer to give me 30 presentations of 50 gig to my
> Alphas which are clustered with my VAX. The Alphas are on 7.3-2, and using
> MSCP (CI and LAVC) are serving the SAN disks to the cluster, and specifically
> the VAX.
> 
> Comes the big day to start using them. Individually they are great, fast
> performance, VAX has no issues INITing / mounting etc. , the LTO backups
> courtesy of the 'new' Alphas are working fine.
> 
> INIT ... 1 to 30 (appropriate labels)
> 
> MOUNT/BIND=myname DISK1:, DISK2:, DISK3: ... DISK30: LABEL1:... LABEL30:
> 
>   (you know the commands I put them in a command file)
> 
> Anyway it gets to the 26th disk and announces:
> 
> %MOUNT-F-SETLIMIT, too many volumes in volume set.
> 
> Err, a HELP/MESSAGE says "The maximum permissible number of volumes in a
> volume set (255) has been reached."
> 
> The user action makes me laugh, how on earth does "Find the other volumes
> in the set and use them first." relate to the issue I experienced? I know
> where they are, I just mounted them, I haven't lost them.
> 
> Anyway back to my problem, 25 is a LONG way off 255 - has anyone ever gone
> beyond 25 members of a volume set? What's the maximum anyone is using?
> 
> Or (excepting using bound volumes in the first place) is there something
> else going wrong here?
> 
> Baldrick
> 
> 

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 (?).