| Title: | + OpenVMS Clusters - The best clusters in the world! + |
| Notice: | This conference is COMPANY CONFIDENTIAL. See #1.3 |
| Moderator: | PROXY::MOORE |
| Created: | Fri Aug 26 1988 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 5320 |
| Total number of notes: | 23384 |
Hi Folks,
I've been reviewing all the docs and can't find a definite answer to my
questions.
I have a customer with a LAN based cluster, OpenVMS 6.2-1H3. The
cluster is made up of three 2100A and one 4100. He MSCP serves all
disks and tapes, but his availibility goals require that he plan a
transition of his cluster to SCSI or DSSI.
The current limitations are three nodes per shared bus, and a maximum of
6 shared buses.
The questions I have are "Could I have multiple shared SCSI buses with
different nodes on each bus? Within the same cluster? Can the same
node be on different shared buses?"
The docs show a shared SCSI bus within a larger cluster, but they never
show more than one.
For example:
Scenario #1
LAN
+---------------+---------------+---------------+
| | | |
2100A 2100A 2100A 4100
| | | |
| SCSI 1 | | SCSI 2 |
+---------------+ +---------------+
DISKS DISKS
Scenario #2
LAN
+---------------+---------------+---------------+
| | | |
2100A 2100A 4100 2100A
| | | | | |
| SCSI 1 | | | | SCSI 2 |
+---------------+--------------+ | |
| | |
+--------------+---------------+
DISKS DISKS
Any help is much appreciated.
Francine Doyon
MCS Canada Eastern District Support
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 5248.1 | EEMELI::MOSER | Orienteers do it in the bush... | Mon Mar 10 1997 11:30 | 3 | |
both configs as you've drawn them are fully supported.
/cmos
| |||||
| 5248.2 | V7.1 Makes This Easier... | XDELTA::HOFFMAN | Steve, OpenVMS Engineering | Mon Mar 10 1997 13:43 | 4 |
V7.1 makes this configuration easier, with the port allocation classes. (One has to line up the controller letters on each end of each shared SCSI bus otherwise... Possible, but somewhat more work.) | |||||
| 5248.3 | EEMELI::MOSER | Orienteers do it in the bush... | Tue Mar 11 1997 01:26 | 39 | |
I talked to Francine and also mentioned that V7.1 will make life
eaiser, but due to a customer application they can't upgrade to
V7.1 right now.
I explained that as long as the device naming is correct, i.e. the
physical same device needs to be seen by each node with the same name,
and a physical different device needs a unique name.
In the following scenario you need one 'spare' SCSI adapter for the
4th node (the one on the right side), in order to match the controller
letters.
Lets assume each of the system has the internal SCSI bus on PKA.
Now for SCSI 1, the 3 systems on the left will use PKB with a KZPSA
installed. For SCSI 2, the middle two systems will use PKC with yet
another KZPSA, so the 4th system needs a spare KZPAA to block PKB
and then install the KZPSA to get a PKC port.
Again as Steve said before, with V7.1 and the new SCSI device naming
you don't need to play games.
Scenario #2
LAN
+---------------+---------------+---------------+
| | | |
2100A 2100A 4100 2100A
| | | | | |
| SCSI 1 | | | | SCSI 2 |
+---------------+--------------+ | |
| | |
+--------------+---------------+
DISKS DISKS
/cmos
| |||||