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Date: Tue, 23 Aug 2005 00:24:42 +0400
From: "Andrew P." <infofarmer@gmail.com>
To: Sebastian Pahlke <sp.ibm@gmx.de>
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Cc: freebsd-questions@freebsd.org
Subject: Re: dd is so slow on my SCSI disc
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On 8/23/05, Sebastian Pahlke <sp.ibm@gmx.de> wrote:
> Hi all,
>=20
> I'm trying to "clean" a disc before selling them:
>=20
> dd if=3D/dev/zero of=3D/dev/da0
>=20
> Do I make something wrong because the transfer rate is only 60932
> bytes/sec??? These are 60 kbytes/sec, slower than my internet connection!=
!!
> :(
>=20
> I tried to increase the block size, with bs=3D32768 I get 3416071 bytes/s=
ec.
> But this is still very poor. The system is a PIII 800MHz and a SCSI-3 dis=
c
> in single user mode booted from FreeBSD release 5.4 live-cd.
>=20
> Any ideas how to analyze this? Thanks in advance!
>=20

Hmm, I'd start with increasing block size up to megabytes
and if that doesn't help - I'd try to copy a large file to/from
the disk and measure the speed.

Also, the smartmontools port can tell you much if the drive
supports SMART.


Andrew P.