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Low polling_interval ( Multipath ) cause high CPU activity / system hang with high number of LUNs while performing Storage failover test (Doc ID 1684696.1)

Last updated on AUGUST 04, 2018

Applies to:

Linux OS - Version Oracle Linux 5.2 to Oracle Linux 6.5 [Release OL5U2 to OL6U5]
Linux x86-64
Linux x86

Symptoms

Customer was performing failover test for his 400 LUns ( 1600 paths in total ), two paths were bring down while two still remains active ( 4 paths in total )

While test was performed and paths were restored after failover test Server became unresponsive and large CPU activity was observed, after 30 minutes Server hang and to restore functionality reboot was required.

Information from top command while failover was performed:

Changes

 No changes were made under OS

Cause

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In this Document
Symptoms
Changes
Cause
Solution
 Scenario
 What is involved to provide accurate solution
 How to calculation is done 
 Conclusion 
References


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