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Date:      Fri, 15 Feb 2013 17:02:52 +0800
From:      jackson wang <jackson4015@gmail.com>
To:        freebsd-scsi@freebsd.org
Subject:   Link rate problem of SAS HDD
Message-ID:  <CAHPbiTZOYhzUQFMJnxVQY6woy27JACDcYgnofCZpmr8xw8yZjg@mail.gmail.com>

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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!



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