[3646] in RedHat Linux List
Re: disk replication
daemon@ATHENA.MIT.EDU (Donnie Barnes)
Sat Nov 9 20:43:22 1996
To: ray@fred.net
cc: redhat-list@redhat.com
In-reply-to: Your message of "Sat, 09 Nov 1996 08:53:09 EST."
<199611091353.IAA00556@picard.fred.net>
Date: Sat, 09 Nov 1996 20:39:18 -0500
From: Donnie Barnes <djb@redhat.com>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
>Borg writes:
> > Donnie Barnes wrote:
> > > I can't think of anything else off the top of my head...anyone else?
> >
> > Isn't it possible to make an image of one
> > disk on another using 'cpio' and/or 'dd'
> > somehow? I lost the original message. Did
> > the original sender want to "mirror" his
> > drives with another ones simulataneously?
> > I thought RAID was for that.
Well, RAID under Linux just isn't there. You can do
RAID 0 with md, but that is not a data replicator, it
simply stripes data between two drives for added
performance. RAID 1 is where data protection starts.
Linux can do an almost RAID 1...it will mirror the data
and so forth. The problem is that there are no utils
to recover data should you loose a drive.
Hardware RAID will work, but it is too expensive for most
folks here to bother with. It also requires you to use
software under some inferior OS to fix things should
something break.
>Seems to me 'mirror' would be the best bet for this.
>If I understand this correctly mirror will give you a
>constant duplicate of the original disk, and that's
>what the author wants.
I think a tar and rsh combo will be more efficient that
mirror, but mirror will work between two machines. The
original poster wanted ways to replicate data both
locally *and* across a network. mirror is the easiest
thing to do over the network, but is not ideal for local
use only.
--Donnie
--
Donnie Barnes http://www.redhat.com/~djb "Bah."
djb@redhat.com http://www.turner.com/lazarusman/
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