| Title: | "ASK THE WIZARDS" |
| Moderator: | QUARK::LIONEL |
| Created: | Mon Oct 30 1995 |
| Last Modified: | Mon May 12 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1857 |
| Total number of notes: | 3728 |
Return-Path: "VMS001::WWW"@vms001.das-x.dec.com Received: by vmsmkt.zko.dec.com (UCX V4.1-12, OpenVMS V6.2 VAX); Mon, 10 Feb 1997 18:45:30 -0500 Received: from vms001 by mail11.digital.com (8.7.5/UNX 1.5/1.0/WV) id SAA05728; Mon, 10 Feb 1997 18:39:28 -0500 (EST) Date: Mon, 10 Feb 1997 18:40:08 -0500 Message-Id: <97021018400815@vms001.das-x.dec.com> From: "VMS001::WWW"@vms001.das-x.dec.com (10-Feb-1997 1840) To: sander@eng.pko.dec.com, dube@zk3.dec.com, wizard@vmsmkt.zko.dec.com Subject: Ask the Wizard: 'PGREWE@AOL.COM' X-VMS-To: wizard@vmsmkt.zko.dec.com Remote Host: (null) Browser Type: Mozilla/2.0 (compatible; MSIE 3.0; AOL 3.0; Windows 95) Remote Info: <null> Pragma: No-Cache Name: Peter Grewe Email Address: PGREWE@AOL.COM CPU Architecture: Alpha Version: v 6.2 Questions: We have three Alpha 1000A's SCSI clustered into a dual HSZ40 Raid. Currently only three hosts are supported on SCSI cluster, or that's what we are only aware of. We would like to project our growth path with additional Alpha's and SCSI clustering. However, will there be support for more than 3 hosts in SCSI cluster??P
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1527.1 | Three; Consider Additional/Alternative Paths | XDELTA::HOFFMAN | Steve, OpenVMS Engineering | Tue Feb 11 1997 10:08 | 38 |
:We have three Alpha 1000A's SCSI clustered into a dual HSZ40 Raid. :Currently only three hosts are supported on SCSI cluster, or that's :what we are only aware of. : :We would like to project our growth path with additional Alpha's and :SCSI clustering. There are multiple transports available for use in a VMScluster, SCSI, FDDI, NI, CI, MC, and DSSI. SCSI itself is a storage-only interconnect, one must use some other connections -- often NI or FDDI -- as the communications path. When adding systems and depending on the communications traffic, I would tend to start configuring SCSI into "triangles" or similar. Triangle: a three-host configuration, where each host has two SCSI busses, each directly connected to one of the other two hosts. I would configure multiple hosts with multiple SCSI busses each, and all hosts are not configured on a single (shared) bus. Placing all hosts on a single SCSI bus can lead the complete configuration becoming unavailable should the shared SCSI bus become disconnected for any reason. I would also start adding faster communications links, such as FDDI and MC. Depending on the distances involved, CI should also be considered. : However, will there be support for more than 3 hosts : in SCSI cluster??P The maximum number of systems that can be connected to a single SCSI bus -- per the V7.1 VMScluster SPD -- is three. I am aware of no announced support for configurations with more than three hosts. | |||||