Re: Cannot see upgraded drives firmware on client.

You can find more information here:

https://www.suse.com/documentation/sles10/stor_admin/data/scandev.html

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Online_Storage_Reconfiguration_Guide/rescan-scsi-bus.html

But I would test this first on a non production server just in case and/or contact linux support in order to get confirmation that this is the officially supported procedure.

Regards

Juanjo