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user76678
Asked: 2012-12-02 10:17:02 +0800 CST

Relying on shared disks for heartbeat

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I read somewhere that using shared disks for heartbeats is reliable even if network totally fails.
I read it in the context of remedy from split-brain.
Is this correct? But I can not understand this. If network fails, doesn't this also affect shared disks?

linux

1 Answers

  1. Best Answer

    If by shared disk you mean a LUN mapped to 2 servers from the SAN, then yes - you can use a LUN as the quorum disk. If you use iSCSI for your SAN and the network equipment used for your iSCSI fails, well then your quorum will fail as well.

    However, adding a quorum disk and using the same network as you use for your production and heartbeat is very stupid - these should be 3 different networks.

    In the environment I have been working with Linux clustering there were 3 ways for the machines in the cluster to communicate:

    • Production network
    • Heartbeat network (separate from prod)
    • Quorum disk (fibre channel)

    I hope that this is what you were looking for :)

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