HA and quorum

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benoitc

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Dec 21, 2019
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I would like to setup a fault tolerant system with 2 nodes only in an Active-Passive pattern with the passive node getting all the data replicated to it. According the documentation [1] we can add an external node to maintain the quorum. Can it be used in a pseudo HA system with the data on a shared file system? Is 2 PVE nodes enough for such design? What would be the other way to do it?


[1] https://pve.proxmox.com/wiki/Cluster_Manager#_corosync_external_vote_support
 
If you're referring to Ceph: third node is a must. If you're referring to NFS/iSCSI from another server then you're good with two.
 
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You'll need the corosync qdevice service. Don't know if this exists for QTS natively. You could run it in a container if your NAS supports that.
 
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People have also used a small system such as a 1L PC (or other SBC that is X86) or a Raspberry Pi as a quorum device.
 
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