HA Cluster on a cheap

[dwma]

Hi,
Wanted to do HA cluster cluster on a cheap with XCP-NG.
At minimum I'll need 3 "compute" nodes and one server or nas acting as a shared storage for these 3 (so basically 4 servers).

I want go cheaper approach with 3 servers, but dunno if it'll work well.

2 of them will be just a compute units, and one bigger with a lot of storage will be also cluster joined, and it'll only host TrueNAS as VM with all disks passed through, which will be shared data store via iSCSI or NFS (via 25gbe nics) to the compute nodes.

Do I need HA? Yes, I'm migrating from VMware and Dell VRTx which is a nice AIO (4 blade servers with shared storage), but since it's EOL I need something newer.

 

[leesteken]

Going for less nodes seems rather counter productive if you want to go for redundancy (and HA).
Please note that HA on Proxmox might be very different from HA on VMware or XCP-NG: https://pve.proxmox.com/pve-docs/pve-admin-guide.html#chapter_ha_manager
Maybe this thread can also be of interest to you, even though you don't plan on using Ceph: https://forum.proxmox.com/threads/fabu-can-i-use-ceph-in-a-_very_-small-cluster.159671/

 

[spirit]

Hi,
Wanted to do HA cluster cluster on a cheap with XCP-NG.
At minimum I'll need 3 "compute" nodes and one server or nas acting as a shared storage for these 3 (so basically 4 servers).

I want go cheaper approach with 3 servers, but dunno if it'll work well.

2 of them will be just a compute units, and one bigger with a lot of storage will be also cluster joined, and it'll only host TrueNAS as VM with all disks passed through, which will be shared data store via iSCSI or NFS (via 25gbe nics) to the compute nodes.

Do I need HA? Yes, I'm migrating from VMware and Dell VRTx which is a nice AIO (4 blade servers with shared storage), but since it's EOL I need something newer.

you need HA, if you want to auto restart vms of a dead node to another node.
you can install corosync qdevice on your truenas as 3rd node.
https://pve.proxmox.com/wiki/Cluster_Manager#_corosync_external_vote_support