[PVE-User] Proxmox Ceph with differents HDD Size

[Chance Ellis]

Yes, you can mix and match drive sizes on ceph. 

Caution: heterogeneous environments do provide challenges. You will want to set your osd weight on the 8TB drives to 2x what the 4TB drives are. In doing so, however, realize the 8TB drives will be expected to "perform" 2x as much as the 4TB drives. If the 8TB are not 2x "faster" the cluster will slow down as the 8TB drives are over worked. To resolve this phenomenon, look into primary_affinity. Primary_affinity allows you to adjust the amount of load on a disk without reducing the amount of data it can contain. 

References:
https://ceph.com/geen-categorie/ceph-primary-affinity/
https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/1.2.3/html/storage_strategies/primary-affinity



On 8/22/18, 3:05 PM, "pve-user on behalf of Gilberto Nunes" <pve-user-bounces at pve.proxmox.com on behalf of gilberto.nunes32 at gmail.com> wrote:

    Hi there
    
    
    It's possible create a Ceph cluster with 4 servers, which has differents
    disk sizes:
    
    Server A - 2x 4TB
    Server B, C - 2x 8TB
    Server D - 2x 4TB
    
    This is ok?
    
    Thanks
    
    ---
    Gilberto Nunes Ferreira
    
    (47) 3025-5907
    (47) 99676-7530 - Whatsapp / Telegram
    
    Skype: gilberto.nunes36
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