Process offline monitoring registrations through the AMF program freezes Symantec Cluster Server nodes on some service packs of AIX 7.1 and 6.1

[해리]

https://www.veritas.com/support/en_US/article.TECH222286

Problem

Process offline monitoring registrations through Asynchronous Monitoring Framework (AMF) freezes Symantec Cluster Server (VCS) nodes on some service packs of AIX 7.1 and 6.1 versions.

This tech note describes an issue that is related to AMF process registrations on AIX systems and the workaround to resolve the issue.

AIX operating systems facing the AMF issue:

• AIX 6.1 TL9 SP3 and SP4
• AIX 7.1 TL2 SP5
• AIX 7.1 TL3 SP3 and SP4

AMF versions impacted:

• 5.1SP1 and later
• 6.0  and later
• 6.1 and later
• 6.2

Error Message

Cause

The above mentioned AIX service packs on AIX 7.1 and AIX 6.1 prevent the AMF driver from fetching process information from the /proc/<pid>/psinfo file when the process is in the “EXEC” state.

Whenever AIX starts (EXECs) a new process, the AMF driver receives a callback from the AIX operating system. In the callback context, the AMF driver reads the process information. This causes a deadlock, as the read call waits for the EXEC operation to complete while the EXEC operation blocks the read call.

Refer to the AIX authorized program analysis report (APAR) from IBM for detailed information:

• AIX 7.1 TL3 SP3 APAR IV52781
• AIX 6.1 TL9 SP3 APAR IV52692

Solution

Install IBM service packs AIX 6.1 TL9 SP5 or AIX 7.1 TL3 SP5 to fix this issue. For information related to the APAR, contact IBM Support.

 

Workaround:

Disable Process offline monitoring with AMF

Before you upgrade to AIX 7.1 TL2 SP5, TL3 SP3 and SP4 or AIX 6.1 TL9 SP3 and SP4, disable the Process offline monitoring of the Intelligent Monitoring Framework (IMF) aware agents such as Process agent, Application agent, and so on, which monitor offline process.

The steps to disable Process offline monitoring with AMF are as follows:

1. Check the current IMF Mode attribute value:

# hatype -display <resource-type> -attribute IMF

# Type Attribute Value

Process IMF Mode 3 MonitorFreq 1 RegisterRetryLimit 3

2. If the value of the Mode attribute is 3, set it to 2 to disable Process offline monitoring:

# hatype -modify <resource-type> IMF -update Mode 2

# hatype -display <resource-type> -attribute IMF

# Type Attribute Value

Process IMF Mode 2 MonitorFreq 1 RegisterRetryLimit 3

3. If the value of Mode attribute is 1, set it to 0 to disable Process offline monitoring:

# hatype -modify <resource-type> IMF -update Mode 0

# hatype -display <resource-type> -attribute IMF

# Type Attribute Value

Process IMF Mode 0 MonitorFreq 1 RegisterRetryLimit 3