I did an installation today on a Dell R250 with a PERC H355 controller. What I understand is that the H355 is not supported so I have set up the disks in 'Non-RAID mode' and installed Proxmox 7.1 with ZFS RAID 1 on 2 disks. So far it looks like it runs just fine. I have tested to boot with first just one disk inserted and then the other way around and it works as expected.
I hope yes. I've checked and checked. Officialy on Dell SIte the R350 is supported by Canonical Ubuntu Server LTS 20.04 and 22.04 i immagine.
also the support answered me:
We don't keep a hardware compatibility list. But PVE 7.2 uses a 5.15 kernel that's based on the one in Ubuntu 22.04.
If those servers are compatible with Ubuntu 22.04, they should be compatible with PVE 7.2 as well.
I know this is an old post but I thought I'd share my experience...
I have two Dell R350's with 4 x 1TB SAS drives and the PERC H355 RAID adapter. I created a RAID10 and installed Proxmox without issue using EXT4 and LVM.
I can't say I've tested performance much but the system does seem stable. Unfortunately Proxmox and VMs all share the same LVM.
I'm kinda disappointed I don't have more SAS drives to go with ZFS. Ideally I'd have liked to have Proxmox installed on a hardware RAID1 and then have 4 disks directly presented to Proxmox for use with ZFS or Ceph - That way I could do some nice high-availability stuff. Sadly budget doesn't allow. At best I could get 1 x small SAS drive for just Proxmox to be installed on with no RAID. I'm considering it but for now I'm using the above config.