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Bug 2001149

Summary: [workload-dfg] Document osd_memory_target_autotune option
Product: [Red Hat Storage] Red Hat Ceph Storage Reporter: Vikhyat Umrao <vumrao>
Component: DocumentationAssignee: Mary Frances Hull <mhull>
Documentation sub component: Configurations Guide QA Contact: skanta
Status: CLOSED CURRENTRELEASE Docs Contact:
Severity: high    
Priority: unspecified CC: asriram, gsitlani, hyelloji, kdreyer, mhull, skanta
Version: 5.0   
Target Milestone: ---   
Target Release: 5.1   
Hardware: Unspecified   
OS: Unspecified   
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Fixed In Version: Doc Type: If docs needed, set a value
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Clone Of: Environment:
Last Closed: 2022-04-05 11:03:19 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2028686    

Description Vikhyat Umrao 2021-09-03 22:35:21 UTC 
Describe the issue:
Document `osd_memory_target_autotune` option

Describe the task you were trying to accomplish:
Please document the option `osd_memory_target_autotune` in osd_memory_target section.

Suggestions for improvement:
Please check the following PR:

https://github.com/ceph/ceph/pull/41463/commits/0f1b31b298d43568505ff8e16f742ede39108f11

The main catch here is the behavior is changing from RHCS 4.x. In RHCS 4.x `osd_memory_target` used to have a static value configured at the time of deployment/installation of the cluster or changed manually. Now in RHCS 5 `osd_memory_target` value will have default starting 4G and will be changed dynamically if `osd_memory_target_autotune` is true. 


From PR:

- set osd_memory_target_autotune=true to enable
- tuning is periodic (check every 10m by default)
- tuned values are reflected by osd_memory_target config options scoped
  to the host
- only make a change if it appears that we will affect at least 1 of the
  relevant OSDs



Document URL: https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/5/html-single/configuration_guide/index#osd-memory-target_conf


Product Version:
RHCS 5