Provided by: cman_3.1.7-0ubuntu2_i386 bug


       dlm_controld - daemon that configures dlm according to cluster events


       dlm_controld [OPTIONS]


       The  dlm  lives in the kernel, and the cluster infrastructure (corosync
       membership and group management) lives in user space.  The dlm  in  the
       kernel  needs  to  adjust/recover for certain cluster events.  It's the
       job of dlm_controld to receive these events and reconfigure the  kernel
       dlm  as  needed.   dlm_controld controls and configures the dlm through
       sysfs and configfs files that are considered dlm-internal interfaces.

       The cman init script usually starts the dlm_controld daemon.


       Command line options override a corresponding setting in cluster.conf.

       -D     Enable debugging to stderr and don't fork.
              See also dlm_tool dump in dlm_tool(8).

       -L     Enable debugging to log file.
              See also logging in cluster.conf(5).

       -K     Enable kernel dlm debugging messages.
              See also log_debug below.

       -r num dlm kernel lowcomms protocol,  0  tcp,  1  sctp,  2  detect.   2
              selects tcp if corosync rrp_mode is "none", otherwise sctp.
              Default 2.

       -g num groupd compatibility mode, 0 off, 1 on.
              Default 0.

       -f num Enable (1) or disable (0) fencing recovery dependency.
              Default 1.

       -q num Enable (1) or disable (0) quorum recovery dependency.
              Default 0.

       -d num Enable (1) or disable (0) deadlock detection code.
              Default 0.

       -p num Enable (1) or disable (0) plock code for cluster fs.
              Default 1.

       -l num Limit the rate of plock operations, 0 for no limit.
              Default 0.

       -o num Enable (1) or disable (0) plock ownership.
              Default 1.

       -t ms  Plock ownership drop resources time (milliseconds).
              Default 10000.

       -c num Plock ownership drop resources count.
              Default 10.

       -a ms  Plock ownership drop resources age (milliseconds).
              Default 10000.

       -P     Enable plock debugging messages (can produce excessive output).

       -h     Print a help message describing available options, then exit.

       -V     Print program version information, then exit.


       cluster.conf(5) is usually located at /etc/cluster/cluster.conf.  It is
       not read directly.  Other cluster components  load  the  contents  into
       memory, and the values are accessed through the libccs library.

       Configuration  options  for  dlm (kernel) and dlm_controld are added to
       the <dlm /> section of cluster.conf, within  the  top  level  <cluster>

   Kernel options
              The  network  protocol  can  be set to tcp, sctp or detect which
              selects tcp or sctp based on the corosync rrp_mode configuration
              (redundant  ring protocol).  The rrp_mode "none" results in tcp.
              Default detect.

              <dlm protocol="detect"/>

              After waiting timewarn centiseconds, the dlm will emit a warning
              via  netlink.   This only applies to lockspaces created with the
              DLM_LSFL_TIMEWARN flag, and  is  used  for  deadlock  detection.
              Default 500 (5 seconds).

              <dlm timewarn="500"/>

              DLM kernel debug messages can be enabled by setting log_debug to
              1.  Default 0.

              <dlm log_debug="0"/>

              The lock directory weight can be specified one  the  clusternode
              lines.   Weights  would  usually  be  used  in  the  lock server
              configurations shown below instead.

              <clusternode name="node01" nodeid="1" weight="1"/>

   Daemon options
              See command line description.

              <dlm enable_fencing="1"/>

              See command line description.

              <dlm enable_quorum="0"/>

              See command line description.

              <dlm enable_deadlk="0"/>

              See command line description.

              <dlm enable_plock="1"/>

              See command line description.

              <dlm plock_rate_limit="0"/>

              See command line description.

              <dlm plock_ownership="1"/>

              See command line description.

              <dlm drop_resources_time="10000"/>

              See command line description.

              <dlm drop_resources_count="10"/>

              See command line description.

              <dlm drop_resources_age="10000"/>

              Enable (1) or disable (0) plock debugging messages (can  produce
              excessive output). Default 0.

              <dlm plock_debug="0"/>

   Disabling resource directory
       Lockspaces usually use a resource directory to keep track of which node
       is the master of each  resource.   The  dlm  can  operate  without  the
       resource  directory,  though,  by  statically assigning the master of a
       resource using a hash of the resource name.  To enable,  set  the  per-
       lockspace nodir option to 1.

         <lockspace name="foo" nodir="1"/>

   Lock-server configuration
       The  nodir  setting  can  be  combined  with  node  weights to create a
       configuration  where   select   node(s)   are   the   master   of   all
       resources/locks.   These  master  nodes can be viewed as "lock servers"
       for the other nodes.

         <lockspace name="foo" nodir="1">
           <master name="node01"/>


         <lockspace name="foo" nodir="1">
           <master name="node01"/>
           <master name="node02"/>

       Lock management will be partitioned among the available masters.  There
       can be any number of masters defined.  The designated master nodes will
       master all resources/locks (according to the resource name hash).  When
       no  masters  are members of the lockspace, then the nodes revert to the
       common  fully-distributed  configuration.   Recovery  is  faster,  with
       little disruption, when a non-master node joins/leaves.

       There is no special mode in the dlm for this lock server configuration,
       it's just a natural consequence of combining the  "nodir"  option  with
       node  weights.   When  a lockspace has master nodes defined, the master
       has a default weight of 1 and all non-master nodes have  weight  of  0.
       An explicit non-zero weight can also be assigned to master nodes, e.g.

         <lockspace name="foo" nodir="1">
           <master name="node01" weight="2"/>
           <master name="node02" weight="1"/>

       In  which  case node01 will master 2/3 of the total resources and node2
       will master the other 1/3.


       dlm_tool(8), fenced(8), cman(5), cluster.conf(5)