Bug 1302361

Summary: Add recommendation to utilize mkfs.xfs defaults to prevent poor performance and/or behavior
Product: [Red Hat Storage] Red Hat Ceph Storage Reporter: Kyle Squizzato <ksquizza>
Component: DocumentationAssignee: Aron Gunn <agunn>
Status: CLOSED CURRENTRELEASE QA Contact: ceph-qe-bugs <ceph-qe-bugs>
Severity: medium Docs Contact:
Priority: medium    
Version: 1.3.0CC: agunn, jkachuck, kdreyer, ngoswami
Target Milestone: rc   
Target Release: 1.3.3   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Last Closed: 2016-09-30 17:22:46 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description Kyle Squizzato 2016-01-27 15:39:01 UTC 
Description of problem:
Add a recommendation bullet point under "CHAPTER 14. ADD OSDS" which suggests using the mkfs.xfs defaults employed by ceph-deploy.  Possibly include a note which states that using non-defaults could result in poor behavior. 

Additional info:

This is to combat customers changing away from the defaults used to format OSDs and encountering bugs in their environments at a later date.  For example, a customer encountered https://bugzilla.redhat.com/show_bug.cgi?id=1278992 when they set '-n 65536' on their OSDs, which is a bug that is entirely due to them using such a high directory block size that is non-default.

While the high directory size issue is a bug in XFS, it is a complicated fix which may take a long time before making it into the RHEL code base.  We can try to prevent further customers from hitting this issue by mentioning this in the Ceph documentation.
Comment 5 Joseph Kachuck 2016-06-14 19:42:20 UTC 
May HPE have access to this BZ?

Thank You
Joe Kachuck