If you are constrained by your existing infrastructure, then a possible choice is a Cluster Aware Filesystem (i.e. OCFS2). Its not endorsed by Proxmox and therefore not robustly tested. Its up to you to implement and support it.Shared iSCSI + LVM would be great but I need snapshot support for our devs.
Good luck
Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
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