Feasibility & sanity check: Scaling a P330 Tiny to a 3-node Proxmox cluster

[buildmylab@lemmus.org]

I’m currently running Proxmox on a single Lenovo ThinkStation P330 Tiny. As my VMs workloads have grown, the 64GB of RAM is consistently sitting near capacity.

To spread the memory load and get proper HA, seamless VMs migration, and easier node maintenance, I’m considering adding two more matching units to build a 3-node cluster.

Planned Per-Node Specs:

. Chassis: Lenovo P330 Tiny
. CPU: Intel Core i9-9900T ES
. RAM: 64GB DDR4-3200 (running at 2666MHz platform limit)
. Boot/Local Storage: 1TB NVMe

Networking: Upgraded to 2.5GbE

Shared Storage:

Synology NAS via iSCSI (SSD cache enabled) over 2.5GbE

Does this setup still offer good value for money, or are there better alternatives in this form factor?

I’d especially appreciate feedback on:

1. 9900T ES stability: Long-term reliability and virtualization quirks under Proxmox.
2. 2.5GbE bandwidth: Is it sufficient for 3 nodes sharing iSCSI, especially during backups or migrations?
3. Synology iSCSI + SSD cache: Practical experience with this as primary VM shared storage across multiple P330 tiny nodes.
4. Any other bottlenecks, hidden traps, or limitations I might be overlooking?