October 2017
Intermediate to advanced
340 pages
9h 46m
English
Content preview from Learning Ceph - Second Edition
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Storage HBA / controller type
HBA, synonymous with controller, describes a server component that attaches storage drives to the rest of the server. If that functionality is embedded in your motherboard versus being implemented with a discrete card, it is still an HBA. Carefully consider using embedded HBA's for Ceph data; their performance may be lackluster at best.
There are two main types of HBA: basic controllers, and ones that offer onboard RAID functionality. Some refer to the former as a JBOD card and the latter as an HBA, though this inaccurate and misleading.
RAID-capable HBAs usually contain a RAID System on Chip (SoC) along with a GB or more of cache memory. As that memory is volatile, it is customary to include a battery backup ...
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