| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 562.1 | Check The SPD | XDELTA::HOFFMAN | Steve, OpenVMS Engineering | Mon May 05 1997 10:23 | 34 |
|
It would be best if you provide us with some additional information
around the specific device(s) or configuration(s) your customer is
interested in.
I am not aware of a dual-ported SCSI disk -- would this be a disk
that is connected to two SCSI busses? Or are you refering to a
disk on a SCSI bus, a SCSI bus connected to more than one host?
If the latter...
Multi-host SCSI is supported by OpenVMS Alpha V6.2 and later, with
V6.2-1H3 and V7.1 having the most supported SCSI controllers and the
most supported configurations. V7.1 has the best support of all of
the available multi-host SCSI configurations; as V7.1 first supports
port allocation classes, which make configuring the SCSI controllers
far easier than on any pre-V7.1 release.
One could conceivably connect a storage controller across two (or more
SCSI busses) for reliability. (Though I don't know of any hardware
available that does this -- it would be the logical equivalent of two
HSZ40 controllers connected together via the three shared SCSI busses.
And I do _not_ know that this configuration is permissible/supported.)
--
The list of devices supported by OpenVMS is included in the Software
Product Description, the SPD, available in the kit distribution and/or
documentation areas referenced by note 8.* and 9.*.
When asking if a configuration is supported, the SPD is the first spot
to look. And for various configuration options and part numbers, check
the DIGITAL Systems and Options Catalog (SOC).
|
| 562.2 | | EEMELI::MOSER | Orienteers do it in the bush... | Mon May 05 1997 11:36 | 5 |
| if you are after multirail failover, then I must tell you that this
is currently not yet available, i.e. for example a dual-redundant
HSZ50 connected to 2 different SCSI buses.
/cmos
|
| 562.3 | Anny plan for dual ported. | NNTPD::"[email protected]" | Thomas | Tue May 06 1997 07:24 | 16 |
| Hi,
Thank you both for you input. I know about multi-host but this is not what the
partner is looking at. What is described in Reply 2 is what the Digital
partner wants. Therefore do you know if there is a plan for support of 2 SCSI
buses connected to one Disk on VMS?
When will this be? What versions of VMS?
He claims he heard about that in a THOT in Nashua!
Thanks for you help.
Regards,
Thomas
[Posted by WWW Notes gateway]
|
| 562.4 | Contact PM Directly | XDELTA::HOFFMAN | Steve, OpenVMS Engineering | Tue May 06 1997 10:38 | 20 |
|
:He claims he heard about that in a THOT in Nashua!
OpenVMS engineering is currently looking at the technical aspects of
allowing a back-to-back HSZnn configuration -- this would have the
SCSI busses "behind" the HSZnn controllers "dual-host" connected, with
the two HSZ controllers connected to seperate SCSI busses (There are
interesting implications around the SCSI disk addressing and failover
in this configuration, but these are probably not insurmountable.)
Per the VMScluster Product Manager, dual-rail storage was not something
that was supported until very recently on various other (CI and DSSI)
interconnects, and this is not something the PM has heard much call for.
Note that the customer can resolve the underlying "data availability"
request immediately, using host-based shadowing and multiple volumes.
If you'd like to discuss this further, you will likely want to contact
the Product Manager directly. (Nick Carr, STAR::NCARR)
|
| 562.5 | yep, but wait | STAR::EVERHART | | Tue May 06 1997 10:46 | 6 |
| A plan exists. Some code even exists for part of the problem and even
works. But this stuff is futures. Wait till at least all of the batter
is mixed and the cake's in the oven before asking when and where it
will be eaten...
|