How do you put Ceph DB and WAL on the same device?

[victorhooi]

Hi,

I'm trying to setup a new Proxmox/Ceph cluster, using Intel S3610 SSDs for the OSDs, and Intel Optane 905P's for the WAL/DB disk.

I'm using the commands from the documentation here.

However, if I try to put both the the DB and WAL on the Optane disk, I get the following error:

# pveceph osd create /dev/sda -db_dev /dev/nvme0n1 -wal_dev /dev/nvme0n1
400 Parameter verification failed.
wal_dev: cannot chose '/dev/nvme0n1' for more than one type.
pveceph osd create <dev> [OPTIONS]

Is there any way to put it on the same device?

Thanks,
Victor

 

[t.lamprecht]

Is there any way to put it on the same device?

You could partition that optane device into two (e.g., with gdisk or fdisk) and use one partition each.

 

[Alwin]

There is no need to specify the WAL separately. The WAL lives with the DB by default.