Link rate problem of SAS HDD

[jackson wang]

Hello,All.

I have a SAS HDD,have some demands as following:

1.Use SCSI command to get the supported link rates,ex:1.5? 3.0? or 6.0 Gb/s;
2.Get current working link rate with SCSI CMD;
3.Need to downgrade 6.0gb/s to 3.0gb/s with SCSI CMD because some RAID
card had bugs,
so speed negotiation sometimes failed;

I know many RAID cards have management tool:CLI,which could make it,
but not all system install that
tool, so using SCSI command is the only option.


PLS help to give some advices.



Thx!