For future reference I found these 2 links which answer most of the questions:
http://docs.ceph.com/docs/master/rados/operations/crush-map/
https://www.openstack.org/assets/presentation-media/Advanced-Tuning-and-Operation-guide-for-Block-Storage-using-Ceph-Boston-2017-final.pdf
We have about 250TB (x3) in our cluster so I am leaning toward not changing things at this point because it sounds like there will be a significant amount of data movement involved for not a lot in return.
If anyone knows of a strong reason I should change the tunables profile away from what I have…then please let me know so I don’t end up running the cluster in a sub-optimal state for no reason.
Thanks,
Shain
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Shain Miley | Manager of Systems and Infrastructure, Digital Media | smiley@xxxxxxx | 202.513.3649
From: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> on behalf of Shain Miley <SMiley@xxxxxxx>
Date: Monday, February 4, 2019 at 3:03 PM
To: "ceph-users@xxxxxxxxxxxxxx" <ceph-users@xxxxxxxxxxxxxx>
Subject: [ceph-users] crush map has straw_calc_version=0 and legacy tunables on luminous
Hello,
I just upgraded our cluster to 12.2.11 and I have a few questions around straw_calc_version and tunables.
Currently ceph status shows the following:
crush map has straw_calc_version=0
crush map has legacy tunables (require argonaut, min is firefly)
- Will setting tunables to optimal also change the staw_calc_version or do I need to set that separately?
- Right now I have a set of rbd kernel clients connecting using kernel version 4.4. The ‘ceph daemon mon.id
sessions’ command shows that this client is still connecting using the hammer feature set (and a few others on jewel as well):
"MonSession(client.113933130 10.35.100.121:0/3425045489 is open allow *, features 0x7fddff8ee8cbffb (jewel))", “MonSession(client.112250505 10.35.100.99:0/4174610322
is open allow *, features 0x106b84a842a42 (hammer))",
My question is what is the minimum kernel version I would need to upgrade the 4.4 kernel server to in order to get to jewel or luminous?
- Will setting the tunables to optimal on luminous prevent jewel and hammer clients from connecting? I
want to make sure I don’t do anything will prevent my existing clients from connecting to the cluster.
Thanks in advance,
Shain
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Shain Miley | Manager of Systems and Infrastructure, Digital Media | smiley@xxxxxxx | 202.513.3649
