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Date: Tue, 28 Mar 2006 11:59:23 -0800
From: Julian Elischer <julian@elischer.org>
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To: Joe Koberg <joe@osoft.us>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: cloning a FreeBSD HDD
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Joe Koberg wrote:

> soralx@cydem.org wrote:
>
>>> On Saturday 25 March 2006 04:42, Mike Meyer wrote:
>>>    
>>>
>>>> One thing: 1m is a bit small for modern systems. Or for not-so-modern
>>>> systems. Since nothing else is running, you might as well use all the
>>>> memory you've got, or as big as you can get a process to be. 128m or
>>>> more is perfectly reasonable.
>>>>       
>>>
>>> It won't go any faster..
>>>
>>> In a modern system the CPU is so much faster than the disk than 
>>> anything above about 16k would be enough.
>>>     
>>
>>
>> I found 64k to be optimal (e.g, max performance) on most machines
>>
>>   
>
> I heard its faster if you use two dd's; i.e:
>
>    # dd if=/dev/ad0 bs=64k | dd of=/dev/ad1 bs=64k
>
> allowing read and write to proceed in parallel.

that's what ddd and 'team' are for.
I don't know if ddd is in the ports as it may clash inname with teh 
debugger ddd
They internally fork and use several processes synchronised in some manner.

>
> Joe Koberg
> joe at osoft dot us
>
>
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