Drive bay numbering: SAS expander
Drive numbering through a SAS Expander is continuous.
- SAS expander port 1 always connects to port 1 of the controller.
- SAS expander port 2 always connects to port 2 of the controller.
- SAS expander port 3 = drive numbers 1-4.
- SAS expander port 4 = drive numbers 5-8.
- SAS expander port 5 = drive numbers 9-12.
- SAS expander port 6 = drive numbers 13-16.
- SAS expander port 7 = drive numbers 17-20.
- SAS expander port 8 = drive numbers 21-24.
- SAS expander port 9 = drive numbers 25-28.
Common configuration examples:
When any stacked 2SFF drive configuration is connected to the SAS expander, the drive numbering skips the second number to allow uFF drive bay numbering.
Front 2SFF to SAS expander port 3:
Rear 2SFF to SAS expander port 9:
Front 2SFF side-by-side (unstacked) to SAS expander port 3:
Rear 3LFF to SAS expander port 9:
- Mid 4LFF to SAS expander port 6:
Front 12LFF + Midplane 4LFF + All rear 2SFF: