From owner-freebsd-hardware  Thu Jan 25 16:27:47 2001
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Date: Thu, 25 Jan 2001 16:21:47 -0500
From: Bakul Shah <bakul@bitblocks.com>
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To: Mike Smith <msmith@freebsd.org>
Cc: Kevin Oberman <oberman@es.net>,
	FreeBSDHW <freebsd-hardware@FreeBSD.ORG>
Subject: Re: Hard Drive cloning
References: <200101260008.f0Q08G100618@mass.dis.org>
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From what I remember you shouldn't need the two dds.  I believe team allows you
to choose the blocksize.  Forking 4 ways should be good enough.  Going through
pipes will slow things down.  But like I said it is from memory -- right now I
am marooned on a windows machine -- so please don't yell at me:-)

    team NNNNN 4 </dev/adNsN > /dev/adMsM

> > Have you any suggestions for reasonable values for 'team' to use for
> > dd?
> >
> > I assume the syntax would be:
> > dd bs=NNNNN if=/dev/adNsN | team NNNNN X | dd bs=NNNNN of=/dev/adNsN
> 
> That's more or less what I'd recommend.
> 
> To take best advantage of FreeBSD's "fast wide pipe" support, the block
> size should be > 64k; I've had good results around 1M.  More than that is
> probably wasteful, and may run you out of physical memory...


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