January 2019
Intermediate to advanced
606 pages
15h 1m
English
book
Ceph: Designing and Implementing Scalable Storage Systems
by Michael Hackett, Vikhyat Umrao, Karan Singh, Nick Fisk
Content preview from Ceph: Designing and Implementing Scalable Storage Systems
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OSD CRUSH map
The CRUSH map holds a variety of information necessary for Ceph to distribute and place objects. Sometimes it is useful to find out if this distribution isn't working properly because of a wrong value in the CRUSH map. The CRUSH map can be downloaded as a file in a binary format that we decompile locally for viewing. It is also possible to dump the CRUSH map and rules directly from the command line, which is expedient for a quick check.
We can use osd crush dump to display the entire CRUSH map.
root@ceph-client0:~# ceph osd crush dump{"devices": [{"id": 0,"name": "osd.0"},..."rules": [{"rule_id": 0,"rule_name": "replicated_ruleset","ruleset": 0,..."tunables": {"choose_local_tries": 0,"choose_local_fallback_tries": 0,"choose_total_tries": ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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