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Newly assigned LUN not visible with error: "The legacy I/O bus instance number exceeded the maximum allowed bus number limit of 256"

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ontap-9
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san
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Applies to

  • HP-UX 11.31
  • Ontap 9
  • AFF-A700

Issue

  • Newly assigned Storage LUN not visible on ioscan on host end with missing device path.
  • Additionally, below warning message gets reported in the syslog file on host end:

Jan 21 14:47:03 ndrcdm01 vmunix: WARNING: The legacy I/O bus instance number exceeded the maximum allowed bus number limit of 256. All I/O bus devices attached to the bus that have instance

Jan 21 16:44:05 ndrcdm01 vmunix: WARNING: The legacy I/O bus instance number exceeded the maximum allowed bus number limit of 256. All I/O bus devices attached to the bus that have instance numbers greater than 255 are not CLAIMED.

 

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