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Bug 1389467

Summary: [RFE] Add to Install Documentation importance of fast IO
Product: Red Hat Satellite Reporter: Bryan Kearney <bkearney>
Component: Docs Install GuideAssignee: Charles Wood <chwood>
Status: CLOSED CURRENTRELEASE QA Contact: Lucie Jirakova <ljirakov>
Severity: high Docs Contact:
Priority: high    
Version: 6.2.0CC: adahms, mmccune, swadeley
Target Milestone: Unspecified   
Target Release: Unused   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
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Clone Of: Environment:
Last Closed: 2017-01-25 16:26:45 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 Bryan Kearney 2016-10-27 16:00:39 UTC 
Customers are installing satelite with slow IO which is causing a negative experience. The install guide, in an pre-requisite sections, should call out the importance of fast IO. Ideally, it is near the suggestion to use XFS.

Document URL: 

Section Number and Name: 

Describe the issue: 

Suggestions for improvement: 

Additional information:
Comment 3 Mike McCune 2016-12-12 20:14:33 UTC 
Recommended minimum:

We recommend a minimum of 80MB/sec Buffered Read Time for read access to the disk used in the /var/ partition. Numbers lower than this on average can cause extreme performance issues with your Satellite installation, upgrade and day to day operations.

In extreme situations slow IO (in the order of 10-20 megabytes/second speeds) to the /var partition has caused Satellite 6.1 to 6.2 upgrades to take in excess of 24 hours or more. 

Testing via the "hdparm -tT" command and examining the "Timing buffered disk reads" line can give a quick estimation on the read speeds for your disk and can quickly spot a potential problem.
Comment 6 Andrew Dahms 2016-12-22 02:16:22 UTC 
Assigning to Charles for review.
Comment 7 Charles Wood 2017-01-25 16:26:45 UTC 
This bug is largely same as Bug 1402242 and the importance of fast I/O has now been added to the documentation.

The content is now live on the customer portal.

It can be found under: I/O Speed Requirements for Satellite 6.2
https://access.redhat.com/documentation/en/red-hat-satellite/6.2/paged/installation-guide/chapter-6-upgrading-satellite-server-and-capsule-server