[comp.sys.dec] HSC70: mixing Ultrix and VMS, restricting access to disks.

YEHAVI@vms.Huji.AC.IL (10/16/89)

  We are running a VAX-6300 with HSC70 to control the disks. We are now
considering connecting one of the MIPS machines (5800 series) to the HSC.
Now, there are two questions:
1. Is it possible at all? (ofcourse each will use different disks). Our
   salesman says it'll work.
2. A more general question: Is it possible to limit inside the HSC access to
   some disks for some hosts; i.e.: disk 0 to 7 will be access only by host A
   and disks 8 to 10 only by host B? I couldn't find anything in the
   HSC manual, so is it impossible?
                                       Thanks in advance,
                                                __yehavi:
Yehavi Bourvine
The Hebrew University of Jerusalem
BITnet: YEHAVI@HUJIVMS

tihor@acf4.NYU.EDU (Stephen Tihor) (10/17/89)

The current HSC interface doesn't seem to have code to do that kind of 
restriction although you can do it with the granularity of a whole HSC.

alan@shodha.dec.com ( Alan's Home for Wayward Notes File.) (10/17/89)

In article <25398b6132a@vms.huji.ac.il>, YEHAVI@vms.Huji.AC.IL writes:
> 
>   We are running a VAX-6300 with HSC70 to control the disks. We are now
> considering connecting one of the MIPS machines (5800 series) to the HSC.
> Now, there are two questions:

> 1. Is it possible at all? (ofcourse each will use different disks). Our
>    salesman says it'll work.

	It's not a supported configuration.  On the other hand I've
	heard that it works.  Be careful if you try though.

> 2. A more general question: Is it possible to limit inside the HSC access to
>    some disks for some hosts; i.e.: disk 0 to 7 will be access only by host A
>    and disks 8 to 10 only by host B? I couldn't find anything in the
>    HSC manual, so is it impossible?

	There is no way to limit access to a disk within the HSC.
	There isn't a good way to limit VMS's access to the Ultrix
	disks.  I think you can SET DEVICE/NOAVAILABLE, but as soon
	as the VMS node reboots it will see them again.  From the
	Ultrix side it's easy to just not configure the VMS disks.
>                                        Thanks in advance,
>                                                 __yehavi:
> Yehavi Bourvine


-- 
Alan Rollow				alan@nabeth.enet.dec.com