RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 568164 - RFE add udpu communication transport to avoid requirement for multicast
Summary: RFE add udpu communication transport to avoid requirement for multicast
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: corosync
Version: 6.0
Hardware: All
OS: Linux
high
low
Target Milestone: rc
: ---
Assignee: Steven Dake
QA Contact: Cluster QE
URL:
Whiteboard:
: 681269 (view as bug list)
Depends On:
Blocks: 624558 655920
TreeView+ depends on / blocked
 
Reported: 2010-02-24 22:21 UTC by Steven Dake
Modified: 2016-04-26 16:50 UTC (History)
7 users (show)

Fixed In Version: corosync-1.2.3-23.el6
Doc Type: Technology Preview
Doc Text:
Clone Of:
Environment:
Last Closed: 2011-05-19 14:23:59 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
example configuration file for those that configure udpu via corosync.conf (and not using the cman service engine) (1.06 KB, application/octet-stream)
2010-11-24 18:41 UTC, Steven Dake 		no flags Details
patch 1 to add udpu support (5.01 KB, patch)
2010-12-02 18:51 UTC, Steven Dake 		no flags Details | Diff
patch 2 to add udpu support (74.13 KB, patch)
2010-12-02 18:51 UTC, Steven Dake 		no flags Details | Diff
patch 3 for udpu support (3.34 KB, patch)
2010-12-02 18:52 UTC, Steven Dake 		no flags Details | Diff
patch 4 to add udpu support (2.30 KB, patch)
2010-12-02 18:52 UTC, Steven Dake 		no flags Details | Diff
View All


Links
System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Article) 37995 0 None None None Never
Red Hat Product Errata RHBA-2011:0764 0 normal SHIPPED_LIVE corosync bug fix update 2011-05-18 18:08:44 UTC

Description Steven Dake 2010-02-24 22:21:55 UTC 
Description of problem:
Some customer environments are not capable of changing their network configuration to enable multicast.

Version-Release number of selected component (if applicable):
corosync-1.2.0-1.el6

Engineering has a concept for a transport called udpu.  Essentially udpu simulates multicast by using UDP unicast to communicate to all the potential cluster members in the system.  Because the replication of packets occurs in the OS rather then the hardware switch, the performance is slower.  Customers desiring plock usage from gfs2 will not be satisfied with the performance of the udpu transport.  MRG customers would also not be satisified.  However, in many use cases such as normal pacemaker operation and small scale clusters (8 nodes or less) that don't require MRG operation or plock operation, the performance should be acceptable.

udpu: uses only UDP unicast - available in all network environments - low performance
udp: uses UDP unicast and UDP multicast - requires network configuration - high performance
iba: uses IBA multicast - IBA switches support multicast in a standard fashion - very high performance
Comment 2 RHEL Program Management 2010-02-24 23:04:33 UTC 
This feature request did not get resolved in time for Feature Freeze
for the current Red Hat Enterprise Linux release and has now been
denied. You may re-open your request by requesting your support
representative to propose it for the next release.
Comment 4 Perry Myers 2010-11-23 22:17:55 UTC 
sdake, can you provide some information on how udpu would be configured in Corosync and used?  This will give us a better idea of what other areas (aside from Luci) need integration work.  Example config files would help here I think.

For example, will we need to expose udpu configuration as part of cluster.conf?  That will mean cloning this bug for cluster component as well and making sure we update the schema.
Comment 6 Steven Dake 2010-11-24 18:34:50 UTC 
Bug #657041 is the cman bugzilla related to this RFE.  The patch has been merged into stable31 to support this feature.
Comment 7 Steven Dake 2010-11-24 18:40:45 UTC 
From corosync.conf man page:

       member This  specifies a member on the interface and used with the udpu
              transport only.  Every node that should be a member of the  mem-
              bership  should  be  specified  as  a separate member directive.
              Within the member directive  there  is  a  parameter  memberaddr
              which specifies the ip address of one of the nodes.

An example corosync.conf showing 16 nodes is attached to this bugzilla.

In the case of cman, the "transport" should be changed to "udpu".  Honza will provide necessary information to make that work in Bug #657041.
Comment 8 Steven Dake 2010-11-24 18:41:45 UTC 
Created attachment 462725 [details]
example configuration file for those that configure udpu via corosync.conf (and not using the cman service engine)
Comment 9 Steven Dake 2010-12-02 18:51:20 UTC 
Created attachment 464333 [details]
patch 1 to add udpu support
Comment 10 Steven Dake 2010-12-02 18:51:52 UTC 
Created attachment 464334 [details]
patch 2 to add udpu support
Comment 11 Steven Dake 2010-12-02 18:52:28 UTC 
Created attachment 464335 [details]
patch 3 for udpu support
Comment 12 Steven Dake 2010-12-02 18:52:57 UTC 
Created attachment 464336 [details]
patch 4 to add udpu support
Comment 14 Steven Dake 2011-03-01 18:20:25 UTC 
*** Bug 681269 has been marked as a duplicate of this bug. ***
Comment 16 errata-xmlrpc 2011-05-19 14:23:59 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/RHBA-2011-0764.html
Note You need to log in before you can comment on or make changes to this bug.