NAME

ocf_heartbeat_sfex - Manages exclusive access to shared storage using Shared Disk File EXclusiveness (SF-EX)

SYNOPSIS

sfex [start | stop | monitor | meta-data | validate-all]

DESCRIPTION

Resource script for SF-EX. It manages a shared storage medium exclusively .

SUPPORTED PARAMETERS

device

Block device path that stores exclusive control data.

(required, string, no default)

index

Location in block device where exclusive control data is stored. 1 or more is specified. Default is 1.

(optional, integer, default 1)

collision_timeout

Waiting time when a collision of lock acquisition is detected. Default is 1 second.

(optional, integer, default 1)

monitor_interval

Monitor interval(sec). Default is 10 seconds

(optional, integer, default 10)

lock_timeout

Valid term of lock(sec). Default is 100 seconds. The lock_timeout is calculated by the following formula.

lock_timeout = monitor_interval + "The expiration time of the lock"

We suggest 90 seconds as a default value of the "The expiration time of the lock", but you should change it in consideration of access delay to the shared disk and the switch time of the multipath driver.

The lock timeout have an impact on start action timeout because start action timeout value is calculated by the following formula.

start timeout = collision_timeout + lock_timeout + "safety margin"

The "safety margin" is decided within the range of about 10-20 seconds(It depends on your system requirement).

(optional, integer, default 100)

SUPPORTED ACTIONS

This resource agent supports the following actions (operations):

start

Starts the resource. Suggested minimum timeout: 120s.

stop

Stops the resource. Suggested minimum timeout: 20s.

monitor

Performs a detailed status check. Suggested minimum timeout: 10s. Suggested interval: 10s.

meta-data

Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5s.

validate-all

Performs a validation of the resource configuration. Suggested minimum timeout: 5s.

EXAMPLE CRM SHELL

The following is an example configuration for a sfex resource using the crm(8) shell:

primitive p_sfex ocf:heartbeat:sfex \
  params \
    device=string \
  op monitor depth="0" timeout="10s" interval="10s"

EXAMPLE PCS

The following is an example configuration for a sfex resource using pcs(8)

pcs resource create p_sfex ocf:heartbeat:sfex \
  device=string \
  op monitor OCF_CHECK_LEVEL="0" timeout="10s" interval="10s"

AUTHOR

ClusterLabs contributors (see the resource agent source for information about individual authors)