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



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 read...


Kai.

From: "Erik Ohrnberger" <Erik echohome org>
Reply-To: Erik echohome org,LVM general discussion and development <linux-lvm redhat com>
To: "LVM general discussion and development" <linux-lvm 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
assumption?

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 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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