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Fence-agents

Jul 20, 2023

OCF Compliant Fence Agents

Fence agents were developed as device “drivers” which are able to prevent computers from destroying data on shared storage. Their aim is to isolate a corrupted computer, using one of three methods

  • Power - A computer that is switched off cannot corrupt data, but it is important to not do a “soft-reboot” as we won’t know if this is possible. This also works for virtual machines when the fence device is a hypervisor.
  • Network - Switches can prevent routing to a given computer, so even if a computer is powered on it won’t be able to harm the data.
  • Configuration - Fibre-channel switches or SCSI devices allow us to limit who can write to managed disks.

This is used by the Pacemaker cluster resource management.

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