Very slow certance lto-2 ultrium

[Rarach]

Hi John,

I think it's OK, sustained transfer speed of this model is 26MB/s.
http://support.euro.dell.com/support/edocs/stor-sys/110TL_Ce/en/ug/specs.htm

I have same drive and my aprox.speed is close 20MB/s

Vladimir


2008/7/9 John Schleigh <johns at networkamericainc.com>:
> I have seen some mention of this, but no solutions yet.
>
> Can someone help me to understand what I need to do to get better than 2.7Mb/s
> transfer rate on this Certance Ultrium 2 tape drive?  It should be able to
> get closer to 20Mb/s.
>
> I have been guessing that I need to set the right blocking factor or
> something, but I really don't know.  I have tried piping tar to mbuffer,
> large block sizes, small block sizes.  Regardless, my shoes are very shiny.
>
> # mt -f /dev/nst0 status
> drive type = Generic SCSI-2 tape
> drive status = 1107296256
> sense key error = 0
> residue count = 0
> file number = 0
> block number = 0
> Tape block size 0 bytes. Density code 0x42 (unknown).
> Soft error count since last status=0
> General status bits on (41010000):
>  BOT ONLINE IM_REP_EN
>
> Linux pe2900 2.6.16.46-0.12-smp #1 SMP Thu May 17 14:00:09 UTC 2007 x86_64
> SLES 10
>
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