How to Troubleshoot I/O Performance under Oracle VM ( dom0 / domU )
(Doc ID 2212880.1)
Last updated on SEPTEMBER 05, 2023
Applies to:
Oracle Cloud Infrastructure - Version N/A and laterOracle Private Cloud at Customer - Version N/A to N/A
Oracle VM - Version 3.2.1 to 3.4.2 [Release OVM32 to OVM34]
Linux x86
Linux x86-64
Goal
How to troubleshoot Oracle VM IO Performance under dom0 ( OVS ) and domU ( Guest )
Solution
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In this Document
| Goal |
| Solution |
| 1. Check general good to know IO performance documents for Oracle Linux |
| 2. Are IO issues visible on Network Based Storage? |
| 3. Are issues visible on Local Storage under OVM ( OVS HW Raid / Local Disks ) ? |
| 4. Is issue visible on FC Storage? |
| 5. Is slowdown visible on any kind of DB performance testing tools like ORION / Swingbench ? |
| 6. Physical or Virtual disks for Oracle VM Guests? |
| 7. Don't stack layers |
| 8. Prepare proper testing to find actual I/O issues |
| 9. Keep oswatcher running while performing any I/O stress test to measure system components performance ( CPU/MEM/Network/IO ) on both dom0 and domU |
| 10. Keep in mind Queue Depth on Repository level or Physical Disks |
| 11. Which I/O Scheduler should be used with Oracle VM to maximize I/O operations and overcome I/O lock issues? |
| 12. Use advanced kernel tools to help with I/O issue investigation |
| 13. Verify if there are any known Storage Unit issues |
| 14. Know your Guest Domain Type |
| 15. Tune dom0/domU I/O performance with xen-blkfront option |
| 16. Keep your dom0( OVS ) and domU( Guest ) updated |
| References |