In message <20121018190231.EBDA7204030 AT gemini.denx DOT de> I wrote:
> 
> I see very poor performance with HP Ultrium LTO3 drive, which is
> attached over SCSI to a Linux box (using a Adaptec 2940 Ultra SCSI
> adapter).  It seems I cannot get more than about 8.8 MBytes/s for
> either writing to or reading from the drive.

The comments I received supported my suspicon that the limiting actor
might be the old SCSI adapter.  I switched to a LSI Logic /
Symbios Logic 53c1010 66MHz  Ultra3 SCSI Adapter on the hardware side,
and experimented a bit with the block size, confirming earlier
postings here that this should be chosenin the 1024 ... 2048 KiB
range.

With this setup I get now sustained data rates of 55...59 MiB/sec for
uncompressible data, and data rates varying between 80...140 MiB/sec
for compressible data.

Thanks!


Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd AT denx DOT de
When some people discover the truth, they just can't  understand  why
everybody isn't eager to hear it.

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