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Date:      Wed, 15 Sep 1999 18:25:32 +0930
From:      Greg Lehey <grog@lemis.com>
To:        Andriss <andriss@andriss.com>
Cc:        questions@FreeBSD.ORG
Subject:   Re: Vinum Concerns  (was: SCSI drive mirroring question)
Message-ID:  <19990915182532.W30655@freebie.lemis.com>
In-Reply-To: <Pine.BSF.4.10.9909141140250.88361-100000@netmint.com>; from Andriss on Tue, Sep 14, 1999 at 11:49:57AM -0400
References:  <Pine.BSF.4.10.9909141140250.88361-100000@netmint.com>

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On Tuesday, 14 September 1999 at 11:49:57 -0400, Andriss wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
>
> Hello,
>
> Someone suggested I use vinum for SCSI drive mirroring. Basically,
> the mirroring does not have to be up-to-minute, it can be done
> nightly, as long as it truely mirrors (copies) the source drive
> to the destination drive.
>
> I thought there would be a simple utility (part of freebsd) that
> could just copy da0 to da1 (with all slices and boot info) but
> guess not...

Somebody suggested rsync, but why bother?  Why take an "almost"
solution when you can do it properly?

> It seems vinum is the only solution if I want to have drive
> mirroring. Would it handle a fresh clean drive (da1) and
> automatically mirror da0 onto it?

Almost.  Check out the "mirror" command.  The only thing it currently
can't do is to mirror the root file system (and yes, I'm working on
it).

> I never worked with vinum (or ccd) so I wouldn't know. Is vinum
> stable enough for a production box?

It's OK, but we're currently having sporadic problems with RAID-5 and
soft updates.  Shouldn't affect you if you only want to mirror.

Greg
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