[Info-vax] RAID vs. MOUNT/BIND

[Wilm Boerhout]

VAXman- @SendSpamHere.ORG mentioned  on 19-11-2010 13:27:
> In article<ic5cik$f3i$3 at online.de>, helbig at astro.multiCLOTHESvax.de (Phillip Helbig---undress to reply) writes:
>> In article
>> <3843bded-c68a-4d35-9b79-749ff1b8547a at v19g2000yqa.googlegroups.com>,
>> onedbguru<onedbguru at yahoo.com>  writes:
>>
>>> I had a customer with an RMS indexed file that was>  40GB using RA90
>>> (1.2GB),RA72(1.0GB) type of disks  in bound volume sets on an 8000-
>>> class system (maybe an 8600???)
>>
>> How many disks can be in a volume set?
>
> The file ID (3 words) limits this to 255:
>
> {FID$W_NUM},{FID$W_SEQ},{FID$B_NMX at 8!FID$B_RVN}
>
> RVN is the relative volume number.  When 0, it's a typical mounted volume.
> When it is non-zero, it represents a volume number in the bound volume set.
> This can be a value of 1 to 255.  (ie. it's an unsigned byte)  I've never
> seen a volume set with 255 volumes but I'm sure that somebody, somewhere,
> must have tested this close to or at its limits.

This can surely be tested with LD disks. I'll have a go this weekend.

First hurdle will probably be the length of the $MOUNT command in DCL... :-)

                       |
Wilm Boerhout         |
Zwolle,               |   'These are the times that try men's souls'
The Netherlands       |   (Thomas Paine, The Crisis)