What is the correct method to change rbd monhost?

[mbarchein]

Hello.

I have a production 3 node proxmox 4.1 cluster with an external RBD storage. The external RBD has 3 nodes, each one with a ceph monitor. The hostnames are ceph0{1,2,3}.mynetwork.com. The ceph cluster is healthy and everything works fine. My /etc/pve/storage.cfg is this:

dir: local
        disable
        path /var/lib/vz
        maxfiles 0
        content iso,rootdir,vztmpl,images

rbd: ceph
        monhost ceph01.mynetwork.com
        username admin
        content images
        krbd
        pool rbd

nfs: host-backup
        server host-backup
        path /mnt/pve/host-backup
        export /srv/nfs4/host-backup
        options vers=3
        content backup
        maxfiles 3

I want to safely change the monhost option to use the three monitors. The monitors are ceph0{1,2,3}.mynetwork.com. Every proxmox node has several running VMs with their disks in the RBD storage. Is it safe to directly modify /etc/pve/storage.cfg on a running cluster? Do I need to reboot each one of the three proxmox hosts after the change or take another action?

Thanks

 

[markusd]

Hi, you can edit wihout rebooting your hosts, but you should use ip`s.
Look e.g. here:
https://pve.proxmox.com/wiki/Storage:_Ceph#Manual_configuration_edit
Running vms may use changes only after stop -start again..
Maybe someone can explain better...

Markus