What is SBD device?

SBD (STONITH Block Device) provides a node fencing mechanism for Pacemaker-based clusters through the exchange of messages via shared block storage (SAN, iSCSI, FCoE, etc.). This isolates the fencing mechanism from changes in firmware version or dependencies on specific firmware controllers.

What is Stonith 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.

How do you enable Stonith in a Pacemaker?

Enable STONITH for your HA topology.

1. Enable the cluster STONITH property by using the following command. $ pcs property set stonith-enabled=true.
2. Update the environment for your deployment to set the ibm-openstack. ha. pacemaker. properties. stonith-enabled. value property to true .

How do I check my Suse cluster status?

To check if the node joins the cluster again:

1. Log in to the node as root or equivalent.
2. Check if the cluster services has started: root # crm cluster status.
3. If not, start it: root # crm cluster start.
4. Check the cluster status with: root # crm status. It should show the node coming online again.

What is SBD in Azure?

In Azure, you have two options for setting up STONITH in the Pacemaker cluster for SLES. You can use an Azure fence agent, which restarts a failed node via the Azure APIs, or you can use a STONITH block device (SBD device).

What is watchdog in cluster?

Watchdog is a sub process of Pgpool-II to add high availability. Watchdog is used to resolve the single point of failure by coordinating multiple Pgpool-II nodes. The watchdog was first introduced in pgpool-II V3. 2 and is significantly enhanced in Pgpool-II V3. 5, to ensure the presence of a quorum at all time.

What is Pacemaker in SAP?

How Pacemaker Cluster works with SAP HANA System Replication. SUSE developed in collaboration with SAP the SAPHanaSR solution and released it as part of SLES for SAP Applications. This solution is based on Pacemaker Cluster that is automating failovers between two SAP HANA databases that are mirroring each other.

What is Pcsd in pacemaker?

NAME. pcsd – pacemaker/corosync configuration system daemon.

What does STONITH stand for?

Shoot The Other Node In The Head
STONITH (Shoot The Other Node In The Head) is a Linux service for maintaining the integrity of nodes in a high-availability (HA) cluster.

Where are Linux cluster logs?

To check the current state of your cluster, use one of the programs crm_mon or crm status . This displays the current DC and all the nodes and resources known by the current node.

What is Pacemaker in Linux cluster?

Pacemaker is a high-availability cluster resource manager. It achieves maximum availability for your cluster services (a.k.a. resources) by detecting and recovering from node- and resource-level failures by making use of the messaging and membership capabilities provided by Corosync.

What is Pacemaker RHEL?

Pacemaker is robust and powerful opensource resource manager which is shipping with Redhat Enterprise Linux 7 as High Availability Add-on . Pacemaker simplified the cluster configuration and cluster management on RHEL 7 which is really good for system administrators.

What is Pgpool watchdog?

“watchdog” is a sub process of pgpool-II aiming for adding high availability feature to it. Features added by watchdog include: Life checking of pgpool service. watchdog monitors responses of pgpool service rather than process.

What is PAS and ASCS and ERS in SAP?

SAP ERP solutions comprise multiple components and services that interact with each other to form a comprehensive network of functions, including but not limited to: ABAP Central Services (ASCS) Java Central Services (SCS) Enqueue Replication Server (ERS) Primary Application Server (PAS)

What is pacemaker RHEL?

What is Corosync pacemaker?

Pacemaker is an open source cluster resource manager (CRM), a system that coordinates resources and services that are managed and made highly available by a cluster. In essence, Corosync enables servers to communicate as a cluster, while Pacemaker provides the ability to control how the cluster behaves.

How do I start Pcsd?

Start and enable the daemon by issuing the following commands on each node: # systemctl start pcsd. service # systemctl enable pcsd.

What is fencing in Redhat 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.

How do I view a cluster log file?

Generate cluster log Use the cluster /log /g command at the command prompt. This command generates the cluster logs to the \windows\cluster\reports directory on each WSFC node.

Where are cluster logs stored?

C:\Windows\Cluster\Reports
Default location is C:\Windows\Cluster\Reports.

Can STONITH be used with storage based death (SBD)?

STONITH using Storage Based Death (SBD). STONITH using Storage Based Death (SBD). This article will help you configure STONITH in a Pacemaker cluster using shared storage and Storage Based Death (SBD)

What is a storage-based death device?

SBD expands to Storage-Based Death or STONITH Block Device . The highest priority of the High Availability cluster stack is to protect the integrity of data. This is achieved by preventing uncoordinated concurrent access to data storage. The cluster stack takes care of this using several control mechanisms.

What are the limitations of SBD?

Limitations Again, the sbd device must not use host-based RAID. sbd is currently limited to 255 nodes per partition. If you have a need to configure larger clusters, create multiple sbd partitions, split the watch daemons across them, and configure one external/sbd STONITH resource per sbd device.

When is the SBD service started?

Thus, the sbd service is started as a dependency whenever the pacemaker service is started. On each node, enable the SBD service: It will be started together with the Corosync service whenever the Pacemaker service is started.