Bug 1907884 - [DDF] The usable capacity is not so straight forward when Ceph comes into picture. [NEEDINFO]
Summary: [DDF] The usable capacity is not so straight forward when Ceph comes into pic...
Keywords:
Status: NEW
Alias: None
Product: Red Hat OpenShift Container Storage
Classification: Red Hat Storage
Component: documentation
Version: 4.5
Hardware: All
OS: All
unspecified
unspecified
Target Milestone: ---
: ---
Assignee: Anjana Suparna Sriram
QA Contact: Elad
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-12-15 12:56 UTC by Direct Docs Feedback
Modified: 2023-08-03 08:30 UTC (History)
1 user (show)

Fixed In Version:
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etamir: needinfo? (asriram)

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Description Direct Docs Feedback 2020-12-15 12:56:41 UTC 
The usable capacity is not so straight forward when Ceph comes into picture.

With Ceph we take into consideration the 'mon_osd_full_ratio' which is 85%, so we loose 15% usable space here. Also the usable capacity depends on the OSD with the lowest free disk size available.

The formula used to calculate MAX_AVAIL for pool is below:

min(osd.avail for osd in OSD_up)* len(osd.avail for osd in OSD_up) /pool.size() 

Reported by: rhn-support-assingh

https://access.redhat.com/documentation/en-us/red_hat_openshift_container_storage/4.5/html/planning_your_deployment/infrastructure-requirements_rhocs#annotations:cadcf3c1-3433-4285-a862-3596f5d448e1
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