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Re: scsi & linux



Hashibon Adham <phadham@aluf.technion.ac.il> wrote:
>  Hi, 
>  
>  We  have a system with an Adaptec AHA-2940UW ultra
>  wide scsi adapter capable of 16 bits transfer mode (not that it says much
>  to me!)

Same as the "W" in the adapter's name.

>   but, when i look at the startup messeges of the redhat 5.1 (with
>  2.0.34 kernel) it says "Refusing WIDE negotiation; using 8 bit transfers"
>  (below is the full messege from the dmesg output.
>  
>  Does this mean we are not getting full performance from our system with
>  linux, can we do any better! 
>  
>  "scsi" part of dmesg output...
>   -----------------------------
>  
>  aic7xxx: Cables present (Int-50 NO, Int-68 YES, Ext-68 NO)

>  (scsi0:0:0:0) Using wide (16 bit) transfers.
>  (scsi0:0:0:0) Synchronous at 10.0MHz, offset 8.
>    Vendor: SEAGATE   Model: ST39173W          Rev: 5764
>    Type:   Direct-Access                      ANSI SCSI revision: 02
>  Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
>  (scsi0:0:3:0) Refusing WIDE negotiation; using 8 bit transfers.
>  (scsi0:0:3:0) Synchronous at 6.67MHz, offset 15.
>    Vendor: ARCHIVE   Model: Python 04106-XXX  Rev: 7270
>    Type:   Sequential-Access                  ANSI SCSI revision: 02
>  SCSI device sda: hdwr sector= 512 bytes. Sectors= 17783240 [8683 MB] [8.7
>  GB]

The message you mention refers to the tape only, not the disk. I don't
understand, though, why the tape is connected to the wide interface.

Regards,

Evgeny


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