Date: Tue, 23 Aug 2005 00:24:42 +0400 From: "Andrew P." <infofarmer@gmail.com> To: Sebastian Pahlke <sp.ibm@gmx.de> Cc: freebsd-questions@freebsd.org Subject: Re: dd is so slow on my SCSI disc Message-ID: <cb5206420508221324292b78e5@mail.gmail.com> In-Reply-To: <007301c5a755$ea1ee840$6701a8c0@monster> References: <007301c5a755$ea1ee840$6701a8c0@monster>
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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.
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