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E-Series How to map LSI/Avago based SAS adapters in Auto port mode

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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  

 

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