Eric F Crist ecrist at
Mon Feb 23 16:20:15 PST 2004

I've been looking for a solution for this, as well.  I want RAID level
copying, so I can just swap harddrives and be back up and running.  If I
have two identical 160GB HDD, on the same IDE cable (pri/sec), how would
I accomplish this, and roughly how long would it take?  Figure both HDD
are full.

Would I activate this by a script?

Eric F Crist
AdTech Integrated Systems, Inc
(612) 998-3588

-----Original Message-----
From: owner-freebsd-questions at
[mailto:owner-freebsd-questions at] On Behalf Of Jerry
Sent: Monday, February 23, 2004 5:45 PM
To: Richard Beyer
Cc: 'FreeBSD Questions List'
Subject: Re: backup

> We're currently doing a back up of a FreeBSD 4.9 (2) server by
> plugging a USB external drive in and then doing
> cp /dev/ad0 /dev/da0
> This takes about 30 hours, (USB 1).
> Is this the best way to do it, or can someone suggest a better way.
> We'd rather not have the server offline while we do it.

I would suggest using dump (and restore if you need something recovered)
if you can because cp may not preserve everything appropriately.

or dump | restore if you are trying to build the file system on to
the other disk.

I wonder also about your choice of devices, but I don't know how you
created them or mounted them.   Actually, I would use their mount names
rather than devices anyway.  Or am I missing something here?

Using dump[/restore] won't speed anything up, but it would make sure
it is usable later.


> Cheers,
> Richard
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