March 2019
Intermediate to advanced
356 pages
10h 7m
English
Content preview from Mastering Ceph - Second Edition
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Overwrite support in erasure-coded pools
Although erasure-coded pool support has been in Ceph for several releases now, before the arrival of BlueStore in the Luminous release, it had not supported partial writes. This limitation meant that erasure pools could not directly be used with RBD and CephFS workloads. With the introduction of BlueStore in Luminous, it provided the groundwork for partial write support to be implemented. With partial write support, the number of I/O types that erasure pools can support almost matches replicated pools, enabling the use of erasure-coded pools directly with RBD and CephFS workloads. This dramatically lowers the cost of storage capacity for these use cases.
For full-stripe writes, which occur either for ...
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