Date: Wed, 28 May 2003 11:04:33 -0400 From: "Joseph Gleason" <clash@tasam.com> To: "adrian kok" <adriankok2000@yahoo.com.hk>, <questions@freebsd.org> Subject: Re: advice about copy from disk to disk Message-ID: <005201c3252a$72b05a00$08695f0a@frigate> References: <20030528141035.32200.qmail@web21204.mail.yahoo.com>
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I usually get better transfer rates with bs=16k or so. What transfer rate do you get? If they are modern drives (which 80gb implies) you should get about 20-30MB/s. At that rate it should take a little over an hour to transfer. To see the transfer start the dd, let it run for maybe 10-15 sec and give it a Ctrl+c. It should print out its transfer rate thus far. Probably far more important than block size, is putting those drives on separate ide channels. Your notation indicates that they are on the same cable, which will slow it down significantly. If all of your ide positions are in use, it might be worth while to get an add on ide card if you are doing this alot. Also, what ide mode are the drives in? You can see this with "atacontrol mode N", where N is the number of the ide channel you are intersted in. If it says PIO4 or something starting with PIO it will probably be quite slow. ----- Original Message ----- From: "adrian kok" <adriankok2000@yahoo.com.hk> To: <questions@freebsd.org> Sent: 28 May, 2003 10:10 Subject: advice about copy from disk to disk > Hi all > > Can you give me advice: quicky copy from disk to disk > > I use command dd and it almost takes the whole day to > copy 80G data! > dd if=seondary master of=secondary slave bs=1024 > (Secondary master to secondary slave)? > > and is there any tools also > > Thank you very much > > _______________________________________________________________________ > Do You Yahoo!? > Get your free @yahoo.com.hk address at http://mail.english.yahoo.com.hk > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" >
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