[linux-lvm] Re: Software raid on top of lvm logical volume

Kai Leibrandt k_leibrandt at hotmail.com
Tue Nov 2 00:33:37 UTC 2004

Solaris' LVM is able to do this all in one manager too, in fact, all volumes 
start life as single raid0 slices, which you then add stripes (keeping it a 
raid0 volume, as Solaris calls it) or mirrors to (to create a raid1 volume). 
Also, for snapshots, you can actually choose where to put the background 
storage for the snapshot, so you can just stick it on a mounted volume that 
has enough space. This is great because you can use all of your physical 
extents of your PV even when using snapshots, instead of reserving some 
space for snapshots in your VG...
Also, admin of volumes under Solaris is really very straight forward, I only 
wish it were so easy with Linux/LVM/md (though it is still not very 
difficult of course), especially when creating a new mirror from a volume, 
adding new pv's etc...
For those who are interested, http://docs.sun.com/db/doc/817-5776 is a good 


>From: "Erik Ohrnberger" <Erik at echohome.org>
>Reply-To: Erik at echohome.org,LVM general discussion and development 
><linux-lvm at redhat.com>
>To: "LVM general discussion and development" <linux-lvm at redhat.com>
>Subject: Re: [linux-lvm] Re: Software raid on top of lvm logical volume
>Date: Mon, 1 Nov 2004 11:51:33 -0500 (EST)
>This solution would seem to be as the holy grail in that it would give you
>the best of all worlds: resizable RAID storage.  Or am I wrong about this
>On Mon, November 1, 2004 11:01, Michael T. Babcock said:
> > Peter T. Breuer wrote:
> >
> >>>i do not believe you would have any advantage in stacking md above lvm
> >>>anyway.
> >>>
> >>>
> >>
> >>That is right. In fact it sounds downright risky to me.
> >>
> >>
> >
> > I've actually considered a few times how one might be able to merge the
> > md functionality into LVM2 (device-mapper) for having software-RAID part
> > of the logical volume system (since a software-RAID partition is a
> > logical volume of another type anyway).
> >
> > It would require some significant effort, but it seems doable.
> > --
> > Michael T. Babcock
> > http://mikebabcock.ca
> > _______________________________________________
> > linux-lvm mailing list
> > linux-lvm at redhat.com
> > https://www.redhat.com/mailman/listinfo/linux-lvm
> > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

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