Re: HZS70 Unit number question



Michael Austin wrote:
Jeffrey H. Coffield wrote:

bill.hall@xxxxxxxxxxxxxxxxxxxxx wrote:
On Apr 24, 12:07 pm, "Jeffrey H. Coffield"
<jeff...@xxxxxxxxxxxxxxxxxxxxx> wrote:
I have two Alphas (not clustered) connected to a HSZ70 that currently
has units D0 through D5 showing as DKC0 through DKC5. DKC0 through DCK4
are mounted on one system and DKC5 is mounted on the other.

I have added some disks and want to add some new units but am concerned
about the SCSI disk numbering and the unit numbering. AFAIK the SCSI
controller takes a unit number (usually 7) so you could only have DKA0
through DKA6 on a bus.

I have read the CLI reference manual on the HSZ70 and can't see any
mention of there being a conflict between the unit number and the SCSI
addressing. It does say that a controller can present up to 8 units on
each target ID number. Both controllers show a SCSI target(s) of (0).

I only want to add two more units which would be DKC6 and DKC7 although
what the actual disk unit is is not important.

Jeff Coffield
Jeff,

As you have your HSZ70 configured, you can "add unit" D0 through D7.
You can add additional target addresses to your controllers that will
allow more units (and do some load balancing if you have redundant
controllers).

set this_controller id=(0,1,2,3) ! up to 8 target id's, but must be
unique on the host scsi bus, hosts are usually 6 and 7

This command will allow the controllers to present unit numbers 0-7,
100-107,200-207, and 300-307.

Bill

AHA, a CFL (green for lightbulb) comes on!.

DKA0 is really DKA000 and is SCSI id 0, SCSI id 1 is DKA100 so SCSI id 7
would be DKA700, not DKA7.

Thanks to you and the others who replied so quickly.
Jeff


SCSI or SAN/Fiber? I know the HSG80 allowed devices to be configured to
only be able to see certain servers - aka "selective presentation". This
allows you to have any number of physical devices that can only be seen
by the system as presented by the controller.

The HSZ70 I have is SCSI. Don't know if they made a fiber version. The
ADD UNIT 6 and 7 worked. I leave all the drives available as the second
system is a hot backup in case the first one fails.

Thanks again to all who answered.

Jeff Coffield
www.digitalsynergyinc.com
.

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