This is an error encountered during the installation of an infrastructure of 3 nodes with a SAS storage 12G (in this case an MD3420)
After applying the patch 5.5.0 2068190 (update2) to 5.5.0 2718055 the Rescan All does not show the new LUN while the old ones still works.
This is due to a bug that overrides the SAS drivers from the customized iso (in my case by Dell) used in the installation phase.
First we must ensure which SAS drivers we are using (because there are two default in VMware lsi_msgpt3 and mpt3).
I suggest these CLI commands::
esxcli software vib list | grip LSI
Then we have to check the driver: esxcli storage core adapter list
If you are using lsi_msgpt3 then we have to disable it:
esxcli system module set –enabled=false –module=lsi_msgpt3
If the driver mpt3 is not present you must download it from here:
https://my.vmware.com/web/vmware/details?downloadGroup=DT-ESXI55-SCSI-MPT3SAS-10000000-1OEM&productId=353
and install it through the Update Manager (or manually from the command line).
Then reboot the host and everything will function normally again..
