E-Series How to map LSI/Avago based SAS adapters in Auto port mode
Applies to
- E-Series
- LSI Avago SAS based Host Bus Adapters
Description
SAS based hosts can lose the data path to the array due to SAS ports to change and to come up in different order.
- Each SAS port exist of four single ports, each port has it's own SAS address. Two SAS ports form a Wide port.
- SAS HBA's should operate in Wide mode by default but native SAS LSI/Avago Host Bus Adapters (HBA) operate in default Auto port mode instead. Therefore the SAS address is dynamically set based on the which port PHY link is established first. This is not the case for SAS HBA's operating in Wide port mode
- This causes indicator to host mapping to fail as the mapping is based on the SAS port address.
Here is an example:
500605b003885d21 Correct SAS address 500605b003885d22 New SAS address after the host has rebooted, link down
-> tditnall 0 ...TDITN..:.................Initiator..................................:..........IOs..........:........Busy.........Idle tditn Ch : Location Device Name Port Name : Open Completed Errs : Ms Ms ------ -- :--------- ---------------- -------------------------------- :----- ---------- ----- :------------ ------------ 1 2 : Am 50080e543e158014 50080e543e158014 : 0 49854 0 : 2774 85940789 2 5 : Am 50080e543e158024 50080e543e158024 : 0 50137 0 : 2846 85940718 3 6 : Am 50080e543e158026 50080e543e158026 : 0 0 0 : 0 85943564 4 4 : barn2 500605b003885d21 500605b003885d21 : 0 2804119 0 : 1790932 4714346 5 4 : Am 50080e543e158020 50080e543e158020 : 0 0 0 : 0 85943564 -< 6 4 :Host_5006 500605b003885d22 500605b003885d22 : 0 1 0 : 0 86606