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Re: [linux-lvm] Long-term snapshots possible?



On Tue, Mar 11, 2003 at 04:38:03PM -0500, Dale J. Stephenson wrote:
> 
> On Tuesday, March 11, 2003, at 10:28  AM, Jason Smith wrote:
> >
> > My problem is, this does not currently look possible without a severe
> > performance hit.  If a volume has, for example, five active snapshots,
> > then the deltas seem to get written five times, once per snapshot 
> > volume.
> >
> I posted a patch (in January?) to implement chained snapshots with 
> LVM1, ensuring that a delta is only copied once, at most.  The downside 
> is that the snapshots are no longer independent, and you can't remove a 
> recent snapshot without invalidating all the older snapshots.  But it 
> is more efficient.
> 
> I didn't keep the message, but I believe chained snapshots will be 
> implemented in LVM2 sometime this year.

Yes they will show up in LVM2 later.

FYI: LVM1 is in feature freeze since last year.

> 
> Dale J. Stephenson
> dalestephenson mac com
> 
> 
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
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                                                  Germany
Mauelshagen Sistina com                           +49 2626 141200
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