Ceph does not like RAID disks. In the past, when I have installed Proxmox 6/7/8 onto a server with a PERC H755 card, I put the data drives into "Non-RAID mode". This lets Ceph view and use the disk. I am trying to install Proxmox 9 for the first time. However, Ceph refuses to use my "Non-RAID" disks. I had to convert them to RAID 0 disks instead before Ceph can view/mount them. Why is this? What is the best way of handling this scenario?
Proxmox 9, Ceph Squid, and PERC H755
- Thread starter proxdrop
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- ceph squid proxmox 9
It isn't supported. A RAID 0 disk isn't supported either. You best bet is to change the controller personality to IT mode, if possible.
What happens exactly? There has been no change regarding this. My bet is that your drives had some kind of partition signature and they simply didn't show in the webUI for you to create the OSD. A wipe disk would be enough.
You may be right that the disks just needed to be destroyed and recreated. I will look closer into IT/HBA mode. I may have been doing things wrong...
However, what didn't change is that Ceph was only able to view and add disks after I placed them into RAID 0 mode, which makes no sense to me.
Placing them in RAID 0 disables pass through and probably removes the partition headers of the drive and / or hides them from the host. Without a more precise answer to "What happens exactly?" its all guessing...