Asset ID:	1-71-1625055.1
Update Date:	2015-03-23
Keywords:

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Solution Type  Technical Instruction Sure

Solution  1625055.1 :   SuperCluster- What are the minimum number of cores required for the global zone per LDom  

Logs / Files to analyze for exavm zone creation failures

In this Document

Goal

Solution

Existing installs

New Installs

References

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Applies to:

Oracle SuperCluster M6-32 Hardware - Version All Versions and later
Oracle SuperCluster T5-8 Hardware - Version All Versions and later
SPARC SuperCluster T4-4 - Version All Versions and later
Oracle SuperCluster T5-8 Full Rack - Version All Versions and later
Oracle SuperCluster T5-8 Half Rack - Version All Versions and later
Oracle Solaris on SPARC (64-bit)
Background: SuperCluster LDoms are frequently deployed with exavm zones for database and application zones and zone clusters in the application (General Purpose) Domains. The present documentation seems to infer you can allocate all of the cores(vCPU) to the zones and they will be shared with the global. This however is not how it should be architected on SuperCluster products.

Goal

 Determine the minimum number of cores that should be retained  for the global zone per LDom.

Solution

Existing installs

From each LDom on the system run:

If you return 1 IB-HCA then you have to reserve 2 cores for the global zone.

If you return anything greater than 1 you have to reserve 4 cores for the global zone.

If you find your configuration has already over allocated cores to the local or branded zones contact support for assistance in changing the pset pool and/or zone configuration to bring your SuperCluster into best practices.

 

New Installs

Work with your presales consultants installers and/or ACS representatives to ensure your SuperCluster layout complies with these minimums.

Documentation Bug, <Bug 18255752> - SuperCluster documentation does not mention min required cores for global zones, has been filed.

References

<NOTE:1452277.1> - SuperCluster Critical Issues
<NOTE:888828.1> - Exadata Database Machine and Exadata Storage Server Supported Versions
<BUG:15813348> - SUNBT7195309 SMB PERFORMANCE TEST SHOWS SEVERE DEGRADATION
<BUG:12951619> - DATABASE TO USE CRITICAL THREADS FEATURE IN SOLARIS
<NOTE:1567979.1> - Oracle SuperCluster Supported Software Versions - All Hardware Types

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