NAME
gfs_controld - daemon that manages mounting, unmounting, recovery and
posix locks
SYNOPSIS
gfs_controld
[OPTION]...
DESCRIPTION
GFS lives in the kernel, and the cluster infrastructure (cluster
membership and group management) lives in user space. GFS in the kernel
needs to adjust/recover for certain cluster events. It's the job of
gfs_controld to receive these events and reconfigure gfs as needed.
gfs_controld controls and configures gfs through sysfs files that are
considered gfs-internal interfaces; not a general API/ABI.
Mounting, unmounting and node failure are the main cluster events that
gfs_controld controls. It also manages the assignment of journals to
different nodes. The mount.gfs and umount.gfs programs communicate with
gfs_controld to join/leave the mount group and receive the necessary
options for the kernel mount.
GFS also sends all posix lock operations to gfs_controld for processing.
gfs_controld manages cluster-wide posix locks for gfs and passes results
back to gfs in the kernel.
OPTIONS
-l <num>
Limit the rate at which posix lock messages are sent to <num> messages per
second. 0 disables the limit and results in the maximum performance of
posix locks. Default is 100.
-w
Disable the "withdraw" feature.
-p
Disable posix lock handling.
-D
Run the daemon in the foreground and print debug statements to stdout.
-P
Enable posix lock debugging messages.
-V
Print the version information and exit.
-h
Print out a help message describing available options, then exit.
DEBUGGING
The gfs_controld daemon keeps a circular buffer of debug messages that can
be dumped with the 'group_tool dump gfs' command.
The state of all gfs posix locks can also be dumped from gfs_controld with
the 'group_tool dump plocks <fsname>' command.
SEE ALSO
groupd(8), group_tool(8)
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