Date: Fri, 26 Jan 2001 12:19:46 -0800 From: Mike Smith <msmith@freebsd.org> To: Greg Lehey <grog@lemis.com> Cc: FreeBSDHW <freebsd-hardware@FreeBSD.ORG> Subject: Re: Hard Drive cloning Message-ID: <200101262019.f0QKJkb00775@mass.dis.org> In-Reply-To: Your message of "Fri, 26 Jan 2001 14:02:33 %2B1030." <20010126140233.C1222@wantadilla.lemis.com>
next in thread | previous in thread | raw e-mail | index | archive | help
> >> 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...
>
> More than 128 kB doesn't help much. That's MAXPHYS, the maximum I/O
> transfer size.
It'll reduce the system call overhead. 8)
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
V I C T O R Y N O T V E N G E A N C E
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hardware" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200101262019.f0QKJkb00775>