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Bug 158356 - Can't fence nodes with WTI NPS-115 switch if on dual power supplies
Summary: Can't fence nodes with WTI NPS-115 switch if on dual power supplies
Alias: None
Product: Red Hat Cluster Suite
Classification: Retired
Component: fence
Version: 3
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Jim Parsons
QA Contact: Cluster QE
Depends On:
TreeView+ depends on / blocked
Reported: 2005-05-20 20:31 UTC by Wendy Cheng
Modified: 2018-11-14 18:20 UTC (History)
4 users (show)

Fixed In Version: ??
Doc Type: Enhancement
Doc Text:
Clone Of:
Last Closed: 2006-08-30 19:52:45 UTC

Attachments (Terms of Use)
Backport from 6.1 (deleted)
2005-05-23 21:57 UTC, Lon Hohberger
no flags Details

Description Wendy Cheng 2005-05-20 20:31:20 UTC
Description of problem:

The current doesn't seem to be able to handle WTI NPS-115 with
*dual* power supplies. The customer has been unable to fence the nodes of their
cluster - look like only one of the power supplies is turned off. 

Is there any workaround available at this moment ? 

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
Actual results:

Expected results:

Additional info:

Comment 1 Lon Hohberger 2005-05-23 19:01:57 UTC
No workarounds at the moment, besides using a Y-adapter for power.

Comment 2 Lon Hohberger 2005-05-23 21:39:15 UTC
According to the other engineers, a backport from RHCS4 / RHGFS 6.1 to RHGFS 6.0
isn't a backport at all; it's as simple as replacing the outdated fencing agent
with the newer (correct) one from 6.1.

Comment 3 Adam "mantis" Manthei 2005-05-23 21:54:49 UTC
FYI:  according to the manual

   "GFS supports dual power-supply fencing with the APC MasterSwitch only; 
    it supports multipath FC fencing with Brocade and Vixel switches."

Another workaround to thisfeature request is to plug in only a single power
supply at this time.

Comment 4 Lon Hohberger 2005-05-23 21:57:09 UTC
Created attachment 114752 [details]
Backport from 6.1

Comment 5 Wendy Cheng 2005-05-23 22:01:20 UTC
lon, please also specify the location (directory) where this script should go. 

Comment 6 Lon Hohberger 2005-05-23 23:00:14 UTC
I think it goes in /sbin as "fence_wti".

Please back up the existing one.

Comment 7 Lon Hohberger 2005-05-23 23:00:50 UTC
Changed to "enhancement" since it's documented as a currently unsupported feature.

Comment 10 Adam "mantis" Manthei 2005-05-26 15:35:17 UTC
in rhel3 now too

Comment 11 Lon Hohberger 2005-05-26 17:32:20 UTC
It should look something oddly like this for GFS 6.0:

nodes {
  foo {
    fence {
      power {
        wti1 {
          port = "1"
          option = "off"
        wti1 {
          port = "5"
          option = "off"
        wti1 {
          port = "1"
          option = "on"
        wti1 {
          port = "5"
          option = "on"

Comment 12 Lon Hohberger 2005-05-26 17:34:13 UTC
See also:

It should work the same way as the APC, except you don't need a "switch=.."

Comment 13 Lon Hohberger 2005-05-26 17:49:26 UTC
Note on power redundancy:

The WTI series switches (except for the TPS-2) have redundant power sources. 
Half of the ports are on rail A, and half are on rail B.  With an IPS-800/800CE
or NPS-115/230, ports 1-4 are on rail A and ports 5-8 are on rail B.

It's important to use one plug from each power rail when controlling a node with
multiple power supplies.  Failure to do so makes the power rail and power source
a single point of failure, which can otherwise be prevented.

Comment 14 Jim Parsons 2006-08-30 19:52:45 UTC
This was fixed by Adam a while back.

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