[ClusterLabs] DRBD split-brain investigations, automatic fixes and manual intervention...

[Ian Diddams]

    On Wednesday, 20 October 2021, 18:08:50 BST, Andrei Borzenkov <arvidjaar at gmail.com> wrote: 
It depends on what hardware you have. For physical systems IPMI may be
available or managed power outlets; both allow cutting power to another
node over LAN.

For virtual machines you may use fencing agent that contacts hypervisor
or management instance (like vCenter).

There is also SBD, it requires shared storage. Third node with iSCSI
target may do it.

Qdevice with watchdog may be an option.

Personally I prefer SBD which is the most hardware-agnostic solution.
========

Thanks again.  As I feared these are whole new areas that Ive never even heard of so this is going to be a long road.

In the emantime while I try and find out what does what and how and how ti implement it if anybody (based on previous info preovided) has a list of "do tyhis

* run A
* run B
* run C"

to get this implementation covered Id be greateful
cheers
ian
  
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