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Feature #39982

cephfs client periodically report cache utilisation to MDS server

Added by Stefan Kooman about 1 year ago. Updated about 1 year ago.

Status:
Duplicate
Priority:
Normal
Assignee:
-
Category:
Administration/Usability
Target version:
-
% Done:

0%

Source:
Tags:
cache mds client
Backport:
Reviewed:
Affected Versions:
Component(FS):
Client, MDS, libcephfs
Labels (FS):
Pull request ID:

Description

After seen Gregory's talk "What are "caps"? (And Why Won't my Client Drop Them?) he explained that the MDS servers need more cache than all cephfs clients combined. With a lot of clients and a lot of cache this might become a problem. If the client would periodically, or when it's talking to the MDS server for some other reason, tell the MDS server how much cache it is utilizing, the MDS server can provide a metric / notify operators when max cache limits are being reached.


Related issues

Duplicates fs - Feature #26996: cephfs: get capability cache hits by clients to provide introspection on effectiveness of client caching Resolved
Duplicates fs - Feature #36253: cephfs: clients should send usage metadata to MDSs for administration/monitoring Resolved

History

#1 Updated by Patrick Donnelly about 1 year ago

  • Duplicates Feature #26996: cephfs: get capability cache hits by clients to provide introspection on effectiveness of client caching added

#2 Updated by Patrick Donnelly about 1 year ago

  • Duplicates Feature #36253: cephfs: clients should send usage metadata to MDSs for administration/monitoring added

#3 Updated by Patrick Donnelly about 1 year ago

  • Status changed from New to Duplicate

Yup, this is something we're working on for Octopus. Thanks Stefan!

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