ocfs2_hb_ctl

ocfs2_hb_ctl(8) OCFS2 Manual Pages ocfs2_hb_ctl(8)

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.