Red Hat Cluster Suite 4 RHEL4 U3 Release Notes Copyright(c) 2006 Red Hat, Inc. ------------------------------------------------------- March 7, 2006 Introduction The following topics are covered in this document: o Changes to Red Hat Cluster Suite 4 o Important Notes o Bugs Fixed in the Release o Related Documentation Changes to Red Hat Cluster Suite 4 The following fence devices have been added to this release: o Dell Remote Access Controller/Modular Chassis (DRAC/MC) NOTE: DRAC/MC firmware 1.2 is required for the DRAC/MC fence device. o IBM Remote Supervisor Adapter II (RSA II) o WTI Remote Power Switch, Model RPS-10 (only used with two-node clusters) Important Notes Cluster Upgrade Consistency Requirement All nodes in a cluster must be upgraded to the same update version. Nodes running different versions of cluster packages on the same cluster are not supported. Adjusting Heartbeat Rate To tune CMAN heartbeat rates for when nodes join a cluster as well as the time elapsed before a node is determined dead, perform the following steps: Run the following commands as root: echo 10 > /proc/cluster/config/cman/hello_timer echo 100 > /proc/cluster/config/cman/deadnode_timeout The first command above configures the rate at which a cluster node thread sends the "HELLO" message to join cluster to 10 seconds (the default value is 5). The second command configures the timeout period (in seconds) to determine when a node is considered dead to 100 seconds (from the default 21 seconds). Apply these values to each node prior to joining them to a cluster with the "cman_tool join" command. clurmtabd As of this release, clurmtabd is no longer used (and is never started). Bugs Fixed in the Release o 173621 -- Kernel panic when other node joins the cluster with cman and bonding o 177163 -- umount of a gfs filesystem hangs o 175805 -- DLM closes connections when it shouldn't o 178738 -- transient hangs caused by ALTMODE bug o 168698 -- fenced init should check if cman init actually joined successfully o 169171 -- mount deadlock after recovery during regression tests o 171246 -- shot master gets marked expired and isn't ever let back into the cluster o 176165 -- seg fault when -c fenced flag is used without action o 178024 -- RFE: Provide a way to retrieve the lock holder from cluster, if possible o 178026 -- RFE: Provide a way to retrieve the lock holder from cluster, if possible [cman/sm] o 178080 -- RFE: sm plugin workaround for bug #177934 o 166109 -- Segfault in clurgmgrd o 178117 -- ccs descriptor bug in smb.sh o 179063 -- NFS export option ro invalid For more information about bugs fixed in this release and other information about the release, refer to the following errata on RHN (https://rhn.redhat.com/): o RHBA-2006:0236 -- cman-kernel bug fix update o RHBA-2006:0237 -- dlm-kernel bug fix update o RHBA-2006:0238 -- gulm bug fix update o RHBA-2006:0239 -- magma bug fix update o RHBA-2006:0240 -- magma-plugins bug fix update o RHBA-2006:0241 -- rgmanager bug fix update o RHBA-2006:0242 -- fence bug fix update o RHBA-2006:0245 -- ccs bug fix update Related Documentation The following related documentation is available at http://www.redhat.com/docs/manuals/csgfs/: o Red Hat Cluster Suite Configuring and Managing a Cluster (for Red Hat Cluster Suite 4) o Release notes for Red Hat Cluster Suite 4 o Red Hat GFS 6.1 Administrator's Guide o Release notes for Red Hat GFS 6.1