Hello to all,
I was wondering is it possible to place different pools on different
OSDs, but using only two physical servers?
I was thinking about this: http://tinypic.com/r/30tgt8l/8
I would like to use osd.0 and osd.1 for Cinder/RBD pool, and osd.2 and
osd.3 for Nova instances. I was following the howto from ceph
documentation:
http://ceph.com/docs/master/rados/operations/crush-map/#placing-different-pools-on-different-osds
, but it assumed that there are 4 physical servers: 2 for "Platter"
pool and 2 for "SSD" pool.
What I was concerned about is how the CRUSH map should be written and
how the CRUSH will decide where it will send the data? Because of the
the same hostnames in cinder and nova pools. For example, is it possible
to do something like this:
# buckets
host cephosd1 {
id -2 # do not change unnecessarily
# weight 0.010
alg straw
hash 0 # rjenkins1
item osd.0 weight 0.000
}
host cephosd1 {
id -3 # do not change unnecessarily
# weight 0.010
alg straw
hash 0 # rjenkins1
item osd.2 weight 0.010
}
host cephosd2 {
id -4 # do not change unnecessarily
# weight 0.010
alg straw
hash 0 # rjenkins1
item osd.1 weight 0.000
}
host cephosd2 {
id -5 # do not change unnecessarily
# weight 0.010
alg straw
hash 0 # rjenkins1
item osd.3 weight 0.010
}
root cinder {
id -1 # do not change unnecessarily
# weight 0.000
alg straw
hash 0 # rjenkins1
item cephosd1 weight 0.000
item cephosd2 weight 0.000
}
root nova {
id -6 # do not change unnecessarily
# weight 0.020
alg straw
hash 0 # rjenkins1
item cephosd1 weight 0.010
item cephosd2 weight 0.010
}
If not, could you share an idea how this scenario could be achieved?
Thanks in advance!!
--
Nikola Pajtic
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