Diskmon process is one of the background process in exadata environment and is a part of Oracle Clusterware ready services.This takes care of the I/O Fencing.
In 11.2.0.1/11.2.0.2 version, Diskmon can handle upto 13instances. Each instance has one diskmon(ora_dskm_<sid>) process.Oracle can fork upto 13 diskmon slaves.This is a limitation in these versions.The CRS startup will hang if the exadata server has more than 13 instances. We could find the below messages in the instance's alert logfile which are failed to start.
ORA-00600: internal error code, arguments: [2116], [900], [], [], [], [], [], [], [], [], [], [] In the alert log and DISKMON logs show dskm_slave_thrd_creat1: no more slave table slots left!
Oracle has provided a patch 9790947 to support upto 62 instances and later introduced another patch 9842238 to completely remove this limitation.Exadata Patch Bundle 4 has covered the latest patch.
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