SUMMARY - HSV110 Multipathing
From: Sheldon Lee Wen (sheldon.leewen_at_cgi.com)
Date: 05/29/03
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Date: Thu, 29 May 2003 09:36:56 -0400 To: tru64-unix-managers@ornl.gov
Many thanks to those who responded.
Here is my original question:
I was wondering if anyone knows... I have an HSV110, with two controllers
each hooked up to a different fibre channel switch, each switch is connected
to my ES45 on a different KGPSA. As I understand it, the multipathing is
active passive, it will failover to a different path if one goes down. Is it
possible to use both concurrently to a SAN volume in order to increase
performance and throughput? (I don't think so, but the project architect is
asking).
Responses:
Actually, on Tru64 UNIX, multipathing is active across all paths with
load-balancing, so no active/passive. This is the default behavior and if
you're not seeing all/both paths active issuing IOs you've either turned it
off manually (or the HSV110 ports are configured incorrectly).
// Thomas
Thomas Sjolshagen
---- re: Special HSV/Switch setup? I don't have a good recollection that anything special is required on the switch. At the time I actually had a Tru64 UNIX setup on an Enterprise, I had to simulate redundant switches by using zones on a single switch. That required special setup, but you should have the multiple switch that allow having redundant fabrics. On the Enterprise side, you have to add all the host HBAs as Ports on the hosts that the storage system recognizes. This is done in the Hosts section of the HSV Element Manager. When the virtual disk is "Presented" to a particular host, the HBAs listed for that host will be available. I believe that's how it works. It was over a year ago that I had access to both an Enterprise and Tru64 UNIX host at the same time. I didn't pay close attention to how or whether the I/O load was distributed among the available ports. As I said in the previous message, the release notes and user documentation for the host kit should have the information you need. Alan Rollow Cheers, Sheldon
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