Re: SCSI tape access on 2.6 kernels?

[Gerhard Schneider <gs@ilsb.tuwien.ac.at>]

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Kai Makisara schrieb:

>>
> What are the speeds negotiated between the SCSI HBA and the tape drive in 
> these cases?
> 

I don't have the data for Megaraid and Fusion (both are not very verbose
on startup), for the very old LSI 875 chipset there it comes:


Vendor: HP        Model: Ultrium 3-SCSI    Rev: G24H
Type:   Sequential-Access                  ANSI SCSI revision: 03
target7:0:4: tagged command queuing enabled, command queue depth 16.
target7:0:4: Beginning Domain Validation
target7:0:4: asynchronous.
target7:0:4: Wide Transfers Fail
target7:0:4: asynchronous.
target7:0:4: FAST-20 SCSI 20.0 MB/s ST (50 ns, offset 16)
target7:0:4: Ending Domain Validation
Attached scsi generic sg9 at scsi7, channel 0, id 4, lun 0,  type 1

I have to investigate why wide negotiation failed (firmware bug - but
they will laugh at me if I ask..), but 20 MB/s should be enough
for more than 1.5 MB/s transfer speed (there are only the tape drive
and the media changer on the bus)

                                      GS

-- 
Gerhard Schneider
Institute of Lightweight Design and         e-Mail: gs@ilsb.tuwien.ac.at
Structural Biomechanics (E317)                 Tel.:   +43 1 58801 31716
Vienna University of Technology / Austria      Fax:    +43 1 58801 31799
A-1040 Wien, Gusshausstrasse 27-29     http://www.ilsb.tuwien.ac.at/~gs/



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