[ALUG] Word of the Day: Shoot The Other Node In The Head

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WhatIsWordOfTheDay  
Word of the Day  
Daily updates on the latest technology terms | February 18, 2014  
STONITH 
STONITH (Shoot The Other Node In The Head) is a Linux service for maintaining the integrity of nodes in a high-availability (HA) cluster.
STONITH automatically powers down a node that is not working correctly. An administrator might employ STONITH if one of the nodes in a cluster can not be reached by the other node(s) in the cluster.
STONITH is traditionally implemented by hardware solutions that allow a cluster to talk to a physical server without involving the operating system (OS). Although hardware-based STONITH works well, this approach requires specific hardware to be installed in each server, which can make the nodes more expensive and result in hardware vendor lock-in. A disk-based solution, such as split brain detection (SBD), can be easier to implement because this approach requires no specific hardware. Continued...

Related terms:
high availability
cluster
I/O fencing
Cluster Labs Pacemaker
Heartbeat
 
Quote of the Day 


 "Windows clustered file systems can generally isolate a defective node logically, while Linux clustered file systems will employ utilities like STONITH to actually power down the questionable node." -- Stephen J. Bigelow

  Quiz Yourself 
You probably know that arachnophobia is the fear of spiders, but what is nomophobia?
a. fear of numbers
b. fear of mispronouncing a word or name
c. fear of being without a mobile phone
Answer  
  
Know-IT-All 
Ensuring high availability in the data center
High availability of virtual machines is essential, but  it is also important to take  high availability at the operating system level into account. 
Safeguarding Linux HA server integrity with STONITH
Using a STONITH approach can help reduce the risk of data corruption in a Linux HA cluster. 
How to implement STONITH in Linux HA clusters
In this tip, you'll read how to implement split brain detection (SBD) STONITH, a program that uses a shared disk device and is easy to implement in most environments.
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