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I/O Fencing Chart

 

 

Split-Brain

Hung Server

Reservations On

 

Alone

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pc8.jpg

            Quroum/Witness

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pc9.jpg

            Watchdog

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pc9.jpg

            Watchdog & Quorum/Witness

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            STONITH (serial)

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Reservations Off

 

Nothing

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            STONITH (serial)

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            CONFIRM_SO*

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            Quorum/Witness

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pc1.jpg

            Watchdog

pc1.jpg

pc4.jpg

Non-Shared Storage

 

Default Features

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            Quorum/Witness

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pc6.jpg

            CONFIRM_SO*

pc6.jpg

pc6.jpg

            Watchdog

pc1.jpg

pc6.jpg

            STONITH (serial)

pc6.jpg

pc5.jpg

            Watchdog & STONITH

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pc8.jpg

 

pc0.jpg File:User:missyg/IOFencingChart/image001.pngpc1.jpg

Most Reliable                                      Least Reliable

 

 

* While CONFIRM_SO is highly reliable (depending upon the knowledge of the administrator), it has lower availability due to the fact that automatic failover is turned off.

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