NAME

       ocfs2_hb_ctl - Starts and stops the O2CB local heartbeat on a given device.

SYNOPSIS

       ocfs2_hb_ctl -S -d device service
       ocfs2_hb_ctl -S -u uuid service
       ocfs2_hb_ctl -K -d device service
       ocfs2_hb_ctl -K -u uuid service
       ocfs2_hb_ctl -I -d device
       ocfs2_hb_ctl -I -u uuid
       ocfs2_hb_ctl -P -d device [-n io_priority]
       ocfs2_hb_ctl -P -u uuid [-n io_priority]
       ocfs2_hb_ctl -h

DESCRIPTION

       ocfs2_hb_ctl starts and stops local heartbeat on a OCFS2 device.  Users are strongly urged
       not to use this tool directly. It is automatically invoked  by  mount.ocfs2(8)  and  other
       tools that require heartbeat notifications.

       This  utility  only  operates  in  the local heartbeat mode. It fails silently when run in
       global heartbeat mode. More information on the heartbeat modes can be found in o2cb(7).

       The tools accepts devices to be specified by its name or its  uuid.  Service  denotes  the
       application that is requesting the heartbeat notification.

OPTIONS

       -S     Starts the heartbeat.

       -K     Stops the heartbeat.

       -I     Prints the heartbeat reference counts for that heartbeat region.

       -d     Specify region by device name.

       -u     Specify region by device uuid.

       -n     Adjust  IO  priority for the heartbeat thread. This option calls the ionice tool to
              set its IO scheduling class to realtime with scheduling  class  data  as  provided.
              This option is usable only with the O2CB cluster stack.

       -h     Displays help and exit.

SEE ALSO

       mount.ocfs2(8) o2cb(7) o2cb(8) o2cb.sysconfig(5) ocfs2.cluster.conf(5) o2cluster(8)

AUTHORS

       Oracle Corporation

COPYRIGHT

       Copyright © 2004, 2012 Oracle. All rights reserved.