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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The 40,000 foot view
To visually see the overall topology of a Ceph cluster, run ceph osd tree. This will show us at once the hierarchy of CRUSH buckets, including the name of each bucket, the weight, whether it is marked up or down, a weight adjustment, and an advanced attribute of primary affinity. This cluster was provisioned initially with 3 racks each housing 4 hosts for a total of 12 OSD nodes. Each OSD node (also known as host, also known as server) in turn houses 24 OSD drives.
# ceph osd tree
ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 974.89661 root default
-14 330.76886 rack r1
-2 83.56099 host data001
0 3.48199 osd.0 up 1.00000 1.00000
...
23 3.48199 osd.23 up 1.00000 1.00000
-3 80.08588 host data002
24 3.48199 ...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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