75 ways to demystify DB2 #73: Techtip : LinuxShield (McAfee) may cause permission issue on DB2 files.
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Recently we have seen a lot of scenarios where LinuxShield (McAfee) was playing a notorious role, so sharing this experience here.
Here is an example of db2diag.log entry :
FUNCTION: DB2 UDB, oper system services, sqloopenp, probe:80
Once you confirm the actual file/dir permissions and ownerships are good, you may write your small C program which can open() the file outside db2 and verify that file itself has no issues then check the presence of LinuxShield (McAfee) using ps -elf and if its present then try to disable it temporarily until the DB2 problem is resolved. You will need to open a ticket with Linux or McAfee support to debug this notorious behavior of LinuxShield (McAfee).