Description
AMF (Asynchronous Monitoring Framework) is a kernel-module on UNIX that hooks itself with the operating system so as to provide Asynchronous/instantaneous notification of resource state changes and eliminating the need for regular poll-based monitoring.
- CFS agent (CFSMount and CFSfsckd) are now AMF-aware.
- CFS agents have been made V51 - prerequisite for AMF.
- CFS agents do not implement any AMF entrypoints.
- CFSMount agent symlinks to the AMF entrypoints implemented for the bundled Mount agent.
- CFSfsckd agent symlinks to the AMF entrypoints implemented for the bundled Process agent.
- VxFS and AMF kernel components use an API to detect:
- file system getting disabled
- change in mount options associated with mounted file systems
- change in mntlock for mounted file systems
Note: By default AMF is not enabled for CFS Agents.
Enabling AMF with CFS
1. Edit /etc/sysconfig/amf and set the AMF_START variable to 1.
AMF_START=1
2. Start the AMF service.
service amf start
3. Enable IMF for CFS Agents
haconf -makerw
hatype -modify CFSMount IMF -update Mode 3
hatype -modify CFSfsckd IMF -update Mode 3
haconf -dump -makero
4. Stop and start the CFS Agents on all nodes in the cluster.
haagent -stop CFSMount -sys <sysname>
haagent -stop CFSfsckd -sys <sysname>
haagent -start CFSMount -sys <sysname
haagent -start CFSfsckd -sys <sysname>
Note: If the CFS Agents are being used use the force option to stop the agent.
Disabling AMF with CFS
1. Disable IMF for CFS Agents
haconf -makerw
hatype -modify CFSMount IMF -update Mode 0
hatype -modify CFSfsckd IMF -update Mode 0
haconf -dump -makero
2. Stop and start the CFS Agents on all nodes in the cluster.
haagent -stop CFSMount -sys <sysname>
haagent -stop CFSfsckd -sys <sysname>
haagent -start CFSMount -sys <sysname
haagent -start CFSfsckd -sys <sysname>
3. Set AMF_START variable to 0 /etc/sysconfig/amf
AMF_START=0
4. Stop the AMF Service
service amf stop
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