NAME

       ocfs2_hb_ctl - Starts and stops the OCFS2 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 the heartbeat on a OCFS2 device.  Users are strongly urged
       not to use this tool directly. It is automatically invoked by mount.ocfs2 and other  tools
       that require heartbeat notifications.

       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

       mkfs.ocfs2(8)    fsck.ocfs2(8)    tunefs.ocfs2(8)     mounted.ocfs2(8)     ocfs2console(8)
       debugfs.ocfs2(8)

AUTHORS

       Oracle Corporation

COPYRIGHT

       Copyright © 2004, 2010 Oracle. All rights reserved.