Date: Sat, 24 Jun 2006 09:00:42 -0700 From: "Nikolas Britton" <nikolas.britton@gmail.com> To: "Dan Nelson" <dnelson@allantgroup.com> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: help with 'tar|rsh tar' Message-ID: <ef10de9a0606240900wb6684drf657de43f644c94e@mail.gmail.com> In-Reply-To: <ef10de9a0606232054lde0552dv38ecee1a50f2b5b9@mail.gmail.com> References: <ef10de9a0606231834w4e286e90u4027ff6f0835131c@mail.gmail.com> <20060624023139.GA83209@dan.emsphone.com> <ef10de9a0606232054lde0552dv38ecee1a50f2b5b9@mail.gmail.com>
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On 6/23/06, Nikolas Britton <nikolas.britton@gmail.com> wrote:
> On 6/23/06, Dan Nelson <dnelson@allantgroup.com> wrote:
> > In the last episode (Jun 23), Nikolas Britton said:
> > > I need to backup the /data directory on hostA to /data on hostB,
> > > about 1TB of data on a gigabit link. Right now I'm using scp but the
> > > handshake latency and ssh overhead is killing me.
> > >
> > > I've looked at many examples of tar|rsh tar and I can't figure it out,
> > > most of the examples on the net look like this:
> > > # tar cf - . | rsh hostname dd of=tape-device obs=20b
> > > # tar -cf -...|rsh ...tar xf -...
> >
> > Two quick options even more lightweight than rsh are netcat (base
> > system) and ttcp (in ports). Usage examples:
> >
> > host2$ ttcp -r | tar xvf -
> > host1$ tar cf - . | ttcp -t host2
> >
> > host2$ nc -l 1234 | tar xvf -
> > host1$ tar cf - . | nc host2 1234
> >
>
> Thanks!, but I got rsh going. I first had to edit /etc/hosts.equiv,
> after that I figured it out:
>
> tar cf - . | rsh 192.168.1.242 'cd /data; tar xpvf -'
>
> I was thinking tar -f as in file.tar but it's not, you have to cd into
> the source directory you want to copy... anyways... I'm getting around
> 30MB/s now... it should be in the 50-60MB/s range... Good enough for
> now though. Thanks again...
>
hostA = P4 3GHz Prescott, Intel 82547EI GigE, FreeBSD 6.1/i386.
hostB = Athlon64 3000, Marvell Yukon Lite GigE, FreeBSD 6.1/amd64.
Anyone know why load is so high on hostA, is it because I used tar -v?
top shows:
hostA:
------
last pid: 21138; load averages: 1.62, 1.34, 1.27
up 25+04:06:44 10:35:54
65 processes: 2 running, 63 sleeping
CPU states: 0.0% user, 1.5% nice, 26.2% system, 61.4% interrupt, 10.9% idle
Mem: 189M Active, 573M Inact, 178M Wired, 51M Cache, 111M Buf, 1652K Free
Swap: 6144M Total, 1012K Used, 6143M Free
PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND
18698 nbritton 1 130 20 1292K 832K RUN 171:46 28.12% rsh
18696 nbritton 1 -4 -20 1588K 1068K getblk 48:25 6.88% bsdtar
hostB:
------
last pid: 9169; load averages: 0.66, 0.65, 0.60
up 0+15:57:38 15:44:02
32 processes: 1 running, 31 sleeping
CPU states: 2.6% user, 0.0% nice, 12.4% system, 36.1% interrupt, 48.9% idle
Mem: 26M Active, 126M Inact, 51M Wired, 13M Cache, 34M Buf, 644K Free
Swap: 483M Total, 480K Used, 482M Free, 8K In
PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND
7445 nbritton 1 4 -15 8112K 3288K sbwait 133:50 9.57% bsdtar
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