What is SCSI fencing?
The fence_scsi agent provides a method to revoke access to shared storage devices, provided that the storage support SCSI persistent reservations. Using SCSI reservations as a fencing method is different from traditional power fencing methods.
How do you enable STONITH in a pacemaker?
Enable STONITH for your HA topology.
- Enable the cluster STONITH property by using the following command. $ pcs property set stonith-enabled=true.
- Update the environment for your deployment to set the ibm-openstack. ha. pacemaker. properties. stonith-enabled. value property to true .
What is fencing in high availability?
Fencing is a very important concept in computer clusters for HA (High Availability). A cluster sometimes detects that one of the nodes is behaving strangely and needs to remove it. This is called fencing and is commonly done with a STONITH resource.
What is fencing in Linux cluster?
Fencing is the disconnection of a node from the cluster’s shared storage. Fencing cuts off I/O from shared storage, thus ensuring data integrity. The cluster infrastructure performs fencing through the STONITH facility.
What is STONITH in pacemaker?
In a Pacemaker cluster, the implementation of node level fencing is STONITH (Shoot The Other Node in the Head). The High Availability Extension includes the stonith command line tool, an extensible interface for remotely powering down a node in the cluster.
What is the role of fencing in a cluster?
Fencing is the process of isolating a node of a computer cluster or protecting shared resources when a node appears to be malfunctioning.
What is VxFEN?
/etc/default/vxfen. This file stores the start and stop environment variables for I/O fencing: VXFEN_START – Defines the startup behavior for the I/O fencing module after a system reboot. Valid values include: 1 – Indicates that I/O fencing is enabled to start up.