What is a SAS HBA card ?

Advice on LSI HBA Card hba slot Most HBA cards plug in to the Peripheral Component Interconnect Express slots of the host computer, although they might come in other form factors, such cherry master slot machine To get more you either need another LSI HBA OR you need a SAS Expander card OR you need a suitable backplane that acts as a SAS Expander A

ug300 slot So lets say, you keep one path to the disks alive & move 1 HBA card to new slot & upgrade it once done, bring the server back up & present all the same disks