gfs_controld (8) - Linux Manuals

gfs_controld: daemon that coordinates gfs mounts and recovery

NAME

gfs_controld - daemon that coordinates gfs mounts and recovery

SYNOPSIS

gfs_controld [OPTIONS]

DESCRIPTION

GFS lives in the kernel, and the cluster infrastructure (corosync 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.

Mounting and node failure are the main cluster events that gfs_controld controls. It also manages the assignment of journals to different nodes. mount.gfs2(8) communicates with gfs_controld to join the mount group and receive the necessary options for the kernel mount.

The cman init script usually starts the gfs_controld daemon.

OPTIONS

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

-D

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

-L

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

-g num

groupd compatibility mode, 0 off, 1 on.
Default 0.

-w num

Enable (1) or disable (0) withdraw.
Default 1.

-h

Print a help message describing available options, then exit.

-V

Print program version information, then exit.

Cluster Upgrading

When performing a rolling upgrade from cluster2 to cluster3, the gfs_controld daemon runs in cluster2 compatibility mode and processes posix lock (plock) requests from the dlm to remain compatible with cluster2 nodes. Otherwise, dlm_controld(8) handles plocks.

-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).

FILES

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 are added to the <gfs_controld /> section of cluster.conf, within the top level <cluster> section.

enable_withdraw

Set to 1/0 to enable/disable a response to a withdraw.

<gfs_controld enable_withdraw="1"/>

Cluster Upgrading

See note above about compatibility plock handling during a rolling upgrade. The following options are deprecated, see dlm_controld(8) for the new equivalent options.

enable_plock

See command line description.

<gfs_controld enable_plock="1"/>

plock_rate_limit

See command line description.

<gfs_controld plock_rate_limit="0"/>

plock_ownership

See command line description.

<gfs_controld plock_ownership="1"/>

drop_resources_time

See command line description.

<gfs_controld drop_resources_time="10000"/>

drop_resources_count

See command line description.

<gfs_controld drop_resources_count="10"/>

drop_resources_age

See command line description.

<gfs_controld drop_resources_age="10000"/>

plock_debug

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

<gfs_controld plock_debug="0"/>