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NetApp Knowledge Base

Why would an FCP SAN host login to storage, then immediately logout?

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ontap-9
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Applies to

  • Data ONTAP operating in 7-Mode
  • Data ONTAP 8
  • ONTAP 9

Answer

  • Fabric zoning and storage configuration may allow a host to initially login to a storage target, but some hosts will logout if they have no LUNs mapped from the target.
  • NetApp's event logs only record when an FCP initiator logs in. FCP logouts are not recorded.
  • FCP logins  are seen in EMS, but when you run commands like

"igroup show -v"

or

"fcp initiator show",

there will be no logins for the affected hosts.

  • The FCP login/logout behavior of the host initiators is managed by the host operating system and/or HBA drivers, and can vary.
  • HPUX and AIX are known for logging out initiators when LUNs are NOT present or not being utilized.
  • Regardless of host operating system, if this behavior is present and there are no LUNs mapped to the host's initiator group (igroup), the first step should be to map a new LUN and rescan and/or reboot the hosts. 

Additional Information

In ONTAP 9, the following command is useful when validating FCP host connectivity: 

fcp ping-initiator -vserver <VSERVER> -wwpn <INITIATOR_WWPN>

 

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