z/VM Problem Determination Flow Chart Analysis

(0) Read this first for pertinent information about Velocity's performance methodology and guidelines -

• zVPS Performance Methodology

(1) What is the system configuration - Is the system configured properly and as expected?

• System Configuration Analysis - Some things to validate

(2) What is the current view of the system?

• System Load Analysis - General system performance information
• Wait State Constraint Analysis - What resources are unavailable to the users/servers
• Be sure to check ESAOPER for errors or other pertinent information around the time of an issue
• If using the zTUNE product, there are many helpful performance suggestions in the ESATUNE report that may be all that is needed to solve a problem quickly!

(3) What are the system and subsystems showing?

• CPU - General Information
• Understanding MFC Data - How is the mainframe cache running
• LPAR - General Information
• LPAR Weights/Overhead Analysis - Is the LPAR performing as expected
• LPAR Pool Analysis - If in use, how are the LPAR pools doing
• Memory - General Information
  • System Memory Analysis - More detailed memory information
  • System Page Analysis - How are the system paging levels
  • IBR Analysis - How is the system utilizing memory
• DASD - General Information
• DASD Configuration Analysis - Is the DASD subsystem configured correctly
• DASD Utilization Analysis - How is the DASD performing
• DASD Cache Analysis - How is the DASD cache performing
• Network - General Information
• Network Configuration Analysis - Is the Network subsystem configured correctly
• Network Data Rate Analysis - How is the Network performing
• QDIO Utilization Analysis - If in use, how is it performing
• OSA Utilization Analysis - If in use, how is it performing
• Channel Analysis - How are the channels performing

(4) What are the users showing?

• User - General Information
• Wait State Constraint Analysis - What resources are unavailable to the users/servers
• CPU - General Information
• User Resource Utilization Analysis - Find problem users/servers
• Linux Configuration Analysis - How are the Linux servers configured
• Linux Utilization Analysis - How are the Linux servers performing
• Validate Virtual CPUs - Does a Linux server have too many vCPUs
• Memory - General Information
  • User Memory Analysis
  • Linux Memory Analysis
  • VDISK Analysis
• DASD - General Information
• DASD Performance Analysis - From a user/server perspective
• Network - General Information
• Network User Data Rate Analysis - Comparing guest LAN to Vswitch activity