Tdmlas,

There isn't a supported path to upgrade the existing drives in place, without either creating a whole new Virtual Disk and then transfer the data from the small VD to the new large one, or by backing up the data, deleting the existing Virtual Disk, then install new drives, reinstall OS, then restore data. 

The reason being is that you cant rebuild the individual drives with the larger drives, as you can't mix HDDs and SSDs in the same Virtual Disk. 

Let me know if this helps.

Are you absolutely sure? I have two SSDs Dell Kioxia 3.84TB 2.5 "12Gbit SAS 081H9C KPM6WVUG3T84. Before that, maybe I didn't make myself clear enough

Model: KPM6WVUG3T84
Capacity: 3.84TB
Type: SSD 2.5 "TLC
TBW: 21,024 TBW
DWPD: 3
Interface: SAS 12GB / s

Tdmlas,

Ok, I stand corrected, as both are SAS SSD's then you could go the route of individually rebuilding each drive, one at a time, but you will need to know that doing so will NOT make the Virtual Disk larger. The reason being is that when you rebuild the original drive, with the new larger drive, the controller will flag the new drive as the same size as the original. So in order to utilize that space you would need to create another Virtual Disk with the free space available. 

Another option would be to add them to the existing raid configuration, but again they would be flagged as the same size as the originals.

The problem is that I currently have RAID1 and RAID6 on the server, so I cannot create another RAID1 on the same server. I understand that the only solution is to take out two old disks, put in two new ones and install Proxmox on a new one, right?

The safest and supported route would be backing up the 2 drive raid 1, then remove them and delete the VD, then recreate with the new drives and reinstall OS and restore data.

Is simply copying the data of each of these disks onto a separate, backup medium enough? I would then remove VD, create a new virtual disk on the new disks and install Proxmox there. And then I will take out one of these disks and copy the configuration files from the current, still production disk (preferably all data from the old disk). Will this solution work?

As far as the first part, that should be correct. As far as taking one of the drives to copy the config from, I am not certain I follow. If you're referring to imaging the data and then applying that image to the new drive, I wouldnt suggest it, as the drives are different and the system state information would be different based on that, so we can't be certain how it will react and if that would endanger the data. Now if you are referring to the VM config files then that would work, but I am not certain why you wouldn't do prior to everything else. Basically from the hardware standpoint your process looks to be correct, but since Proxmox isn't fully supported, the steps you perform regarding the OS config I couldn't tell you. 

Hi Chris H, 

How to create an additional larger VD in PERC 710 and then transfer from existing smaller VD to the new one?

Hi, you can not do VD migration from SSD to SAS disk, I'm afraid.