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Date:      Fri, 11 Oct 2002 14:42:42 +0200
From:      "Lasse Laursen" <laursen@netgroup.dk>
To:        "Marc Perisa" <perisa@porsche.de>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: Raid-1 and Vinum
Message-ID:  <02b801c27123$b18cbd60$1a01000a@area51>
References:  <020d01c27120$47746de0$1a01000a@area51> <3DA6C81B.9000102@porsche.de>

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Hi,

I know how a RAID 1 works :) I was just interested in knowing if it would be
possible to mount a single disk from the raid (the working part of the RAID
1) as a regular disk and access the data...

It will hopefully never be used but it's nice to know our options :) (we
have had some nasty accidents in the past...)

Regards

--
Lasse Laursen <laursen@netgroup.dk> - Systems Developer
NetGroup A/S, St. Kongensgade 40H, DK-1264 København K, Denmark
Phone: +45 3370 1526 - Fax: +45 3313 0066 - Web: www.netgroup.dk

- We don't surf the net, we make the waves.
----- Original Message -----
From: "Marc Perisa" <perisa@porsche.de>
To: "Lasse Laursen" <laursen@netgroup.dk>
Cc: <freebsd-stable@freebsd.org>
Sent: Friday, October 11, 2002 2:46 PM
Subject: Re: Raid-1 and Vinum


> Lasse Laursen wrote:
> > Hi all,
> >
> > I have a small question regarding Vinum and Raid-1 that I hoped someone
> > would be able to answer.
> >
> > We have a storagetak raid with 2 x 65 GByte RAID 5 arrays. We are going
to
> > mount both arrays under FreeBSD and then use software raid 1 (Vinum) to
> > mirror the two raids (It's a single point of failure in a huge cluster
so
> > it's really important to never loose any data).
> >
> > We have several Linux systems running software raid 1 and if one of the
> > disks fail in the mirror then the other disk can simply be mounted - is
it
> > the same procedure under FreeBSD? Eg. if one of the raids fail we will
be
> > able to mount the existing part of the raid as a regular disk?
> >
> > (please reply to my email address as well as to the list)
> >
> > Thanks in advance :)
> >
> >
> > Regards
> >
>
>
> Hi Lars,
>
> as far as I understand Vinum you don't have to mount another disk to use
> the mirror.
>
> It works as follows:
>
> define a mirrored RAID using Vinum
> mount that mirrored RAID
> write data to it
>
> If one mirror fails (in your case: your RAID-5 looses 2 disks at once)
> Vinum will set that "device" (your array) to failed and continue
> operations with a "degraded" RAID-1. No (re-)mounting needed.
>
> (Now stuff learned from looking while someone else has done it - not
> from own experience:) If you bring that RAID-5 back online, you tell
> Vinum to bring that back online (I think you have to fiddle through
> disk, subdisk and plex config) and continue operations.
>
> Hope that helps
>
> Marc
>
>
>



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