WWN ID Detects on FC Switch After Some Hours

[azlans27]

I've problem in my environment. FC Switch need long time to re-detect the WWN id at VMware host, every after shutdown/restart one of ESXi hosts. It can take 5-6 hours to re-detect again, which is abnormal I think. While, my other hosts is normal, mean re-detect immediately after shutdown/restart host.

Here is my environment condition:

Esxi Host - vSphere 6.5 (IBM X3550 M4) ==> FC Switch (IBM 2498 – B24) ==> Storage (IBM V7000)

HBA Card for host: Emulex 12000 dual port 8 GB

I need your suggestion guys, which part I should check to fix this issue?

Best Regards,

Azlan Syah

[rcporto · Accepted solution]

Assuming your SAN switch SFP is 8Gbps, try to fix the speed at the HBA for 8Gbps instead of Auto. I already experienced a similar problem in the past with IBM HS22 blades and the solution was set the speed to fixed instead of Auto.

[azlans27]

Hi Mr. Richardson,

Thank you very much to respond my question.

Which side I should configure as your suggestion? at VMware host or SAN Switch side?

Best Regards,

Azlan Syah

[rcporto]

That configuration should be done at the HBA BIOS. The following IBM Retain Tip shows additional configurations for IBM BladeCenter but that should helps you too: https://support.podc.sl.edst.ibm.com/support/home/docdisplay?lndocid=MIGR-5087103