Only one CPU is detected on a server with more than 1 CPUs or cores

Solution Verified - Updated -


  • A virtual machine which had only one CPU previously was given 2 CPUs, but still detects only one, as seen in /proc/cpuinfo file. The same can happen to a physical server.


  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

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