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Bug 450133

Summary:	dlm: keep cached master rsbs during recovery
Product:	Red Hat Enterprise Linux 5	Reporter:	David Teigland <teigland>
Component:	kernel	Assignee:	Don Zickus <dzickus>
Status:	CLOSED ERRATA	QA Contact:	Cluster QE <mspqa-list>
Severity:	low	Docs Contact:
Priority:	low
Version:	5.2	CC:	ccaulfie, edamato, lwang
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2009-01-20 20:22:06 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description David Teigland 2008-06-05 14:51:51 UTC

Description of problem:

Keep cached rsb's during recovery instead of throwing them away.
If there are frequent recoveries (joins/leaves of the lockspace),
the rsb caching is defeated, and the resource masters become
unstable, confusing the dlm. 

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


How reproducible:


Steps to Reproduce:
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Actual results:


Expected results:


Additional info:

Comment 1 David Teigland 2008-06-05 15:15:14 UTC

fixed in upstream commit:

From 85f0379aa0f9366bb6918e2e898a915231176fbd Mon Sep 17 00:00:00 2001
From: David Teigland <teigland>
Date: Wed, 16 Jan 2008 13:02:31 -0600
Subject: [PATCH] dlm: keep cached master rsbs during recovery

To prevent the master of an rsb from changing rapidly, an unused rsb is kept
on the "toss list" for a period of time to be reused.  The toss list was
being cleared completely for each recovery, which is unnecessary.  Much of
the benefit of the toss list can be maintained if nodes keep rsb's in their
toss list that they are the master of.  These rsb's need to be included
when the resource directory is rebuilt during recovery.

Signed-off-by: David Teigland <teigland>

Comment 2 RHEL Program Management 2008-06-05 16:34:30 UTC

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.

Comment 3 David Teigland 2008-06-05 19:25:07 UTC

patch posted to rhkernel-list

http://post-office.corp.redhat.com/archives/rhkernel-list/2008-June/msg00088.html

Comment 5 Don Zickus 2008-07-16 15:48:20 UTC

in kernel-2.6.18-97.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 9 errata-xmlrpc 2009-01-20 20:22:06 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2009-0225.html