Very slow certance lto-2 ultrium

[Nick_Parrott at Dell.com]

Check drive is correctly terminated, and check system logs for SCSI errors

Set channel speed to 160, or less, rather than 320 in the SCSI BIOS for you controller (common that auto-negotiate speed decides to use 320 rather than 160 or 80)

 

From: linux-poweredge-bounces at dell.com [mailto:linux-poweredge-bounces at dell.com] On Behalf Of Marcio Jacson Santos
Sent: 10 July 2008 17:53
To: Justin Zygmont
Cc: linux-poweredge-Lists
Subject: Re: Very slow certance lto-2 ultrium

 

I have the same problem with my lto-2 ultrium, very slow 2.4mb/s

I using debian etch

Wait for return,

Marcio

2008/7/10 Justin Zygmont <justin.zygmont at phyworks-ic.com>:



-----Original Message-----
From: linux-poweredge-bounces at dell.com
[mailto:linux-poweredge-bounces at dell.com] On Behalf Of John Schleigh
Sent: 09 July 2008 19:54
To: linux-poweredge at dell.com
Subject: Very slow certance lto-2 ultrium

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



I have the same hardware, and get high transfer rates...


# mt -f /dev/nst0 status

SCSI 2 tape drive:
File number=-1, block number=-1, partition=0.
Tape block size 0 bytes. Density code 0x0 (default).

Soft error count since last status=0

General status bits on (50000):
 DR_OPEN IM_REP_EN


I am using RHEL5 however,



_______________________________________________
Linux-PowerEdge mailing list
Linux-PowerEdge at dell.com
http://lists.us.dell.com/mailman/listinfo/linux-poweredge
Please read the FAQ at http://lists.us.dell.com/faq




-- 
Marcio Jacson dos Santos
www.informatech.com.br
Informatech Informática Ltda.
Fone (47) 30263236
Mobile (47) 91783841

=================================================
o(s) arquivo(s) anexo(s) são endereçadas exclusivamente à(s) pessoa(s) e/ou instituição(ões) acima indicada(s), podendo conter dados confidenciais, os quais não podem, sob qualquer forma ou pretexto, ser utilizados, divulgados, alterados, impressos ou copiados, total ou parcialmente, por pessoas não autorizadas. Caso não seja o destinatário, favor providenciar sua exclusão e notificar o remetente imediatamente. O uso impróprio será tratado conforme as normas da empresa e da legislação em vigor.
Esta mensagem expressa o posicionamento pessoal do subscritor e não reflete necessariamente a opinião da Informatech.
============================== 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.us.dell.com/pipermail/linux-poweredge/attachments/20080711/d76ccde4/attachment.htm