Updated corosync packages that fix a bug are now available for Red Hat Enterprise Linux 6.
[Update 18 August 2011] The channel mappings in this erratum have been updated. No changes have been made to the packages.
The corosync packages provide the Corosync Cluster Engine and C Application Programming Interfaces (APIs) for Red Hat Enterprise Linux cluster software.
Compared to a unicast token, certain network switches add an extra delay to the transmission of a multicast packet. Consequent to this, multicast messages may have been retransmitted, even though the message was not lost and the retransmission was therefore not necessary. This update introduces the "miss_count_const" constant that allows a user to specify the maximum number of times a message is checked for retransmission before the retransmission is performed.
All users of corosync are advised to upgrade to these updated packages, which fix this bug.