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Load on segment server is increasing over time

Environment

Product Version
 DCA  2.0
 Linux kernel    version 2.6.32-279.14.1.el6 and 2.6.32-431.el6
 Pivotal Greenplum (GPDB)  All versions

Symptoms

  • xfsaild is in I/O sleep (output from ps -efly | grep xfsaild, show state = 'D')
  • The load on the affected segment node increases over time
  • The GPDB sessions also get stuck in uninterruptible sleep (ps -efly | grep ^D ) 
  • Database cannot be stopped, nor is it able to recover from a PANIC

Cause

This is due to a confirmed bug with the Linux kernel. Details of the bug are available from this Red Hat article

Resolution

The only solution is to upgrade your kernel to version 2.6.32-431.el6 or higher. This fix is included in all versions of DCA software 2.0.3.0 and later.

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