You could also create two roots and two rules and have the primary osd be the 10k drives so that the 7.2k are used primarily for writes. I believe that recipe is on the CRUSH page in the documentation.
Robert LeBlanc
Sent from a mobile device please excuse any typos.
On Jul 9, 2015 10:03 PM, "Alexandre DERUMIER" <aderumier@xxxxxxxxx> wrote:
Hi,
you need to create 2 crushmaps, 1 for 10k && 1 for 7.2k disks.
then create 2 pools, 1pool with crushmap1 and 1 pool with crushmap2.
see :
http://www.sebastien-han.fr/blog/2014/08/25/ceph-mix-sata-and-ssd-within-the-same-box/
----- Mail original -----
De: "Christoph Adomeit" <Christoph.Adomeit@xxxxxxxxxxx>
À: "ceph-users" <ceph-users@xxxxxxxxxxxxxx>
Envoyé: Vendredi 10 Juillet 2015 02:13:04
Objet: How to prefer faster disks in same pool
Hi Guys,
I have a ceph pool that is mixed with 10k rpm disks and 7.2 k rpm disks.
There are 85 osds and 10 of them are 10k
Size is not an issue, the pool is filled only 20%
I want to somehow prefer the 10 k rpm disks so that they get more i/o
What is the most intelligent wy to prefer the faster disks ?
Just give them another weight or are there other methods ?
Thanks
Christoph
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