dd is so slow on my SCSI disc

[Emanuel Strobl]

Am Montag, 22. August 2005 22:13 CEST schrieb Sebastian Pahlke:
> Hi all,
>
> I'm trying to "clean" a disc before selling them:
>
> dd if=/dev/zero of=/dev/da0
>
> Do I make something wrong because the transfer rate is only 60932
> bytes/sec??? These are 60 kbytes/sec, slower than my internet
> connection!!!
>
> :(
>
> I tried to increase the block size, with bs=32768 I get 3416071
> bytes/sec. But this is still very poor. The system is a PIII 800MHz and
> a SCSI-3 disc in single user mode booted from FreeBSD release 5.4
> live-cd.
>
> Any ideas how to analyze this? Thanks in advance!

Hmm, what dows systat (-vm 1) tell you? What's the disk load, maybe you're 
suffering from interrupt storms? I can't you help much with specific SCSI 
parts, but maybe you want to try 6.0-BETA3, if I remember correctly there 
were some adaptec problems fixed...

-Harry

>
> greetings,
>
> Sebastian Pahlke
>
>
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