[ceph-users] Weighting question

2014-12-31 Thread Lindsay Mathieson
As mentioned before :) we have two osd ndoes with one 3TB osd each. (replica 2) About to add a smaller (1TB) faster drive to each node From the docs, normal practice would be to weight it in accordance with size, i.e 3 for the 3TB OSD, 1 for the 1TB OSD. But I'd like to spread it 50/50 to take

Re: [ceph-users] Weighting question

2015-01-01 Thread Lindsay Mathieson
On Thu, 1 Jan 2015 08:27:33 AM Dyweni - Ceph-Users wrote: > I suspect a better configuration would be to leave your weights alone > and to > change your primary affinity so that the osd with the ssd is used first. Interesting > You > might a little improvement on the writes (since the spinne

Re: [ceph-users] Weighting question

2015-01-02 Thread Christian Balzer
On Thu, 01 Jan 2015 13:59:57 +1000 Lindsay Mathieson wrote: > As mentioned before :) we have two osd ndoes with one 3TB osd each. > (replica 2) > > About to add a smaller (1TB) faster drive to each node > > From the docs, normal practice would be to weight it in accordance with > size, i.e 3 for

Re: [ceph-users] Weighting question

2015-01-02 Thread Dyweni - Ceph-Users
Hi, I'm going to take a stab at this, since I've just recently/am currently dealing with this/something similar myself. On 2014-12-31 21:59, Lindsay Mathieson wrote: As mentioned before :) we have two osd ndoes with one 3TB osd each. (replica 2) About to add a smaller (1TB) faster drive to

Re: [ceph-users] Weighting question

2015-01-02 Thread Dyweni - Ceph-Users
On 2015-01-01 08:27, Dyweni - Ceph-Users wrote: Hi, I'm going to take a stab at this, since I've just recently/am currently dealing with this/something similar myself. On 2014-12-31 21:59, Lindsay Mathieson wrote: As mentioned before :) we have two osd ndoes with one 3TB osd each. (replica

Re: [ceph-users] Weighting question

2015-01-02 Thread Lindsay Mathieson
On Thu, 1 Jan 2015 08:50:20 AM you wrote: > > http://ceph.com/docs/master/rados/operations/crush-map/#primary-affinity > > > > > > This may help you too: > > http://cephnotes.ksperis.com/blog/2014/08/20/ceph-primary-affinity H - so if I have three OSD's on a Node (looking at get two extra d

Re: [ceph-users] Weighting question

2015-01-02 Thread Dyweni - Ceph-Users
On 2015-01-01 14:04, Lindsay Mathieson wrote: On Thu, 1 Jan 2015 08:27:33 AM Dyweni - Ceph-Users wrote: You might a little improvement on the writes (since the spinners have to work too), but the reads should have the most improvement (since ceph only has to read from the ssd). Couple of t

Re: [ceph-users] Weighting question

2015-01-02 Thread Gregory Farnum
The meant-for-human-consumption free space estimates and things won't be accurate if you weight evenly instead of by size, but otherwise things should work just fine -- you'll simply get full OSD warnings when you have 1TB/OSD. -Greg On Thu, Jan 1, 2015 at 3:10 PM Lindsay Mathieson < lindsay.mathie