Date: Tue, 28 Mar 2006 11:15:45 -0600 From: Joe Koberg <joe@osoft.us> To: soralx@cydem.org Cc: freebsd-hackers@freebsd.org Subject: Re: cloning a FreeBSD HDD Message-ID: <44296F41.1050209@osoft.us> In-Reply-To: <200603272210.43032.soralx@cydem.org> References: <HCEOIFALKKLBLJPENPNOMEMNCAAA.khaled@ipbill.com> <17444.13967.998120.314837@bhuda.mired.org> <200603281139.29588.doconnor@gsoft.com.au> <200603272210.43032.soralx@cydem.org>
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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.
Joe Koberg
joe at osoft dot us
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