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Ceph: Designing and Implementing Scalable Storage Systems
book

Ceph: Designing and Implementing Scalable Storage Systems

by Michael Hackett, Vikhyat Umrao, Karan Singh, Nick Fisk
January 2019
Intermediate to advanced content levelIntermediate to advanced
606 pages
15h 1m
English
Packt Publishing
Content preview from Ceph: Designing and Implementing Scalable Storage Systems

Balancing

In this section, we'll explore what to do about it. The larger a cluster's OSD count grows, the wider the variance can become, approximating a bell curve. The ceph osd df utility can be used to summarize the utilization of each OSD along with an indication of how much it varies from the overall average. Here's an example of a cluster's distribution before and after we take action. Here our least full OSD is 29% full, just 80% of the cluster's mean, and the most full is over 44% full, 124% of the cluster's mean.

# ceph status
   cluster ce2bcf60-efd0-1138-bxc5-936beak1s9a7
     health HEALTH_OK
     monmap e1: 5 mons at {mon01=10.7.4.4:6789/0,mon02=10.7.4.5:6789/0,mon03=10.7.4.132:6789/0,mon04=10.7.4.133:6789/0,mon05=10.7.5.4:6789/0}
 election ...
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Publisher Resources

ISBN: 9781788295413