You may also be interested in the cbt code that does this kind of thing
for creating cache tiers:
https://github.com/ceph/cbt/blob/master/cluster/ceph.py#L295
The idea is that you create a parallel crush hierarchy for the SSDs and
then you can assign that to the pool used for the cache tier. An
example YAML config to create pool profiles that uses this looks
something like:
pool_profiles:
basepool:
pg_size: 1024
pgp_size: 1024
cache:
pool_profile: 'cachepool'
mode: 'writeback'
replication: 'erasure'
erasure_profile: 'ec62'
cachepool:
crush_profile: 'cache'
pg_size: 1024
pgp_size: 1024
replication: 2
hit_set_type: 'bloom'
hit_set_count: 8
hit_set_period: 60
target_max_objects: 102400
target_max_bytes: 68719476736
On 04/14/2015 04:13 AM, Vincenzo Pii wrote:
Hi Giuseppe,
There is also this article from Sébastien Han that you might find
useful:
http://www.sebastien-han.fr/blog/2014/08/25/ceph-mix-sata-and-ssd-within-the-same-box/
Best regards,
Vincenzo.
2015-04-14 10:34 GMT+02:00 Saverio Proto <zioproto@xxxxxxxxx
<mailto:zioproto@xxxxxxxxx>>:
Yes you can.
You have to write your own crushmap.
At the end of the crushmap you have rulesets
Write a ruleset that selects only the OSDs you want. Then you have to
assign the pool to that ruleset.
I have seen examples online, people what wanted some pools only on SSD
disks and other pools only on SAS disks. That should be not too far
from what you want to achieve.
ciao,
Saverio
2015-04-13 18:26 GMT+02:00 Giuseppe Civitella
<giuseppe.civitella@xxxxxxxxx <mailto:giuseppe.civitella@xxxxxxxxx>>:
> Hi all,
>
> I've got a Ceph cluster which serves volumes to a Cinder
installation. It
> runs Emperor.
> I'd like to be able to replace some of the disks with OPAL disks
and create
> a new pool which uses exclusively the latter kind of disk. I'd
like to have
> a "traditional" pool and a "secure" one coexisting on the same
ceph host.
> I'd then use Cinder multi backend feature to serve them.
> My question is: how is it possible to realize such a setup? How
can I bind a
> pool to certain OSDs?
>
> Thanks
> Giuseppe
>
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