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Documentation #22160

docs: Cache Tier page has not been updated for Luminous

Added by Kaoet Ibe over 6 years ago. Updated over 6 years ago.

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New
Priority:
Normal
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-
Category:
documentation
Target version:
-
% Done:

0%

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Description

In http://docs.ceph.com/docs/master/rados/operations/erasure-code/ , it says that "Since Luminous, partial writes for an erasure coded pool may be enabled with a per-pool setting.". However, in http://docs.ceph.com/docs/master/rados/operations/cache-tiering/, it says that "..., and because small writes are not yet supported by the erasure-coded pool" in the "KNOWN BAD WORKLOADS" section.

It seems that partial write is already supported in luminous. Maybe we should update the documentation of Cache Tier and tell users whether "RBD with replicated cache and erasure-coded base" is still a bad use-case.

History

#1 Updated by Greg Farnum over 6 years ago

  • Subject changed from Inconsistence between documentation of Cache Tier & Erasure Code to docs: Cache Tier page has not been updated for Luminous

Just using RBD directly on an EC-overwrites pool will perform better than using a cache tier in the vast majority of cases. But it is indeed an inconsistency; patches welcome! ;)

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