Re: :( 12 Partition Limit!?!?!??? :(

[johnlb@primenet.com (John Bowling)]

In article <4rn8qi$dgb@atlantis.atlantis.actrix.gen.nz>,
David Empson <dempson@atlantis.actrix.gen.nz> wrote:
>In article <4rhp72$s2h@nnrp1.news.primenet.com>,
>John Bowling <johnlb@Primenet.Com> wrote:
>> 
>> There are some route around the problem.  If you have two HD interface
>> boards, you can use both.  They should be different boards.  2 RamFast
>> or 2 Apple boards will both try to use the same addresses.
>
>That would be a neat trick, considering that each slot has its own
>unique address range (unless the card bypasses the normal address
>decoding).

Looks like I goofed on that one!

>You can certainly install multiple original Apple SCSI cards in one
>machine.  You _might_ have trouble with DMA handling with multiple
>Apple High-Speed SCSI cards, but I very much doubt it.
>
>The GS/OS device driver reference says that SCSI.Manager will work
>with multiple Apple SCSI cards.
>
>It is possible that you may have trouble installing multiple RamFast's
>into the same machine, but I can't say anything either way as I've
>never used the RamFast, and don't know enough about its CPU
>interfacing architecture.
>
>> Part of the problem is with the OS.  Any P8 program, such as ProTerm,
>> cannot find the top 4 drives and no HFS drives.  I think the limit is 8
>> with P8.  And I suspect that GS/OS itself has a limit somewhere.
>
>GS/OS does have a limit: each driver is not able to support more than
>63 (possibly 64) volumes.  This means you cannot have more than 63
>SCSI partitions (over all device types) with a RamFast card, and
>cannot have more than 63 hard drive partitions (plus 63 CD-ROM
>partitions) with one or more Apple cards.

The RamFast has a built in usable limit of 12.  While it might handle 
more if they are disabled, it cannot display more than 12.  I seem to recall
from posts about this a few months ago that the RamFast limit is with the
display, and may be able to access partitions you can't display.  
Unfortunatly, if you cannot use the on screen list to look for them and 
adjust their status, you might as well not have them!

>> The reason large drives are not recommended is that there is limited space
>> for the bit map.
>
>[Neil Parker gave a correct description of this.]

I goofed on that too.  Was I sleeping when I posted that?

>-- 
>David Empson
>dempson@actrix.gen.nz
>Snail mail: P.O. Box 27-103, Wellington, New Zealand

Thanks for the corrections

John


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- John Bowling          -- Did anyone notice the recent switch by the
- johnlb@primenet.com   -- southern baptists to become anti-christians?
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