So I was able to remove the drive but now I have an issue, related to the cciss drives used by the controller and Proxmox.
The same error happens in the GUI.
root@blade1:~# ceph-disk zap /dev/cciss/c0d2
Caution: invalid backup GPT header, but valid main header; regenerating
backup header from main header.
****************************************************************************
Caution: Found protective or hybrid MBR and corrupt GPT. Using GPT, but disk
verification and recovery are STRONGLY recommended.
****************************************************************************
GPT data structures destroyed! You may now partition the disk using fdisk or
other utilities.
Creating new GPT entries.
The operation has completed successfully.
root@blade1:~# pveceph createosd /dev/cciss/c0d2
unable to get device info for 'cciss/c0d2'
root@blade1:~#