[PVE-User] Request to update wiki, risk of dataloss

[Thomas Lamprecht]

Hi,

On 4/12/19 4:41 PM, Mark Schouten wrote:
> Hi,
> 
> I'm in the process of upgrading some older 4.x clusters with Ceph to current versions. All goes well, but we hit a bug that is understandable, but undocumented. To prevent others from hitting it, I think it would be wise to document to issue.
> 
> It is when you already upgraded Ceph to Luminous and not yet Proxmox to 5.x. Resizing a disk makes Proxmox request the current disk size. Because Luminous says 'GiB' or 'MiB' and older versions say 'GB' or 'MB', $size = 0+$increaseresizesize. A customer of mine resized their disk from 50GB to 20GB because of this issue.
> 
> So maybe a warning on https://pve.proxmox.com/wiki/Ceph_Jewel_to_Luminous and/or https://pve.proxmox.com/wiki/Upgrade_from_4.x_to_5.0 is possible?
> 

It added one here:
https://pve.proxmox.com/wiki/Ceph_Jewel_to_Luminous#Check_cluster_status_and_adjust_settings
at the bottom, hope this makes it clearer.

Thanks for the suggestion!

cheers,
Thomas