Is OS drives of Proxmox an IOPS limiting factor?

[bsinha]

Hi,

We want to procure a 3-node Proxmox cluster with Ceph. The configuration of each node would be as follows:

1. Memory: 384GB
2. CPU: 40 core (80 Thread)
3. OS: 2 enterprise SSD drives in RAID1 mode
4. Ceph OSD: 5 x enterprise mixed used NVMe SSD drives. (All will be connected to the On-board storage controller in HBA mode)
5. NIC: 25 Gbps x4 (Full mesh connectivity with no storage switch in between)

My question is:

1. The IOPS of the SSD drives for the operating system is way lower than the NVMe SSD drives. Will the Operating System drive affect the performance of the NVMe drives that would be used as OSD drives in a ceph cluster and the VM residing on the ceph volume lacks IOPS?

 

[waltar]

No, even 2 raided hdd's work fine and are better for reliability than just 1 nvme ... - with fast OS disk it's just faster booting that's all.