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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Bobtail – CRUSH_TUNABLES2
The Bobtail profile fixes several CRUSH issues:
- In CRUSH hierarchies with a smaller number of devices in buckets, such as a host leaf bucket with one OSDs - three OSDs under it, the PGs may get mapped to less than the desired number of replica
- In larger Ceph clusters with several hierarchy layers (row, rack, host, osd) it is possible that a small amount of PGs could get mapped to less than the desired amount of OSDs
- If an OSD gets marked out in Bobtail, the data usually gets rebalanced to nearby OSDs in the bucket instead of across the entire CRUSH hierarchy
The following are the new tunables:
- choose_local_tries: The number of local retries is given by this tunable. The legacy and optimal values are 2 and 0, respectively. ...
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