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Re: [linux-lvm] writable snapshots ? (a la timefinder BCV)



On Sun, May 19, 2002 at 11:22:59AM +0200, David Stes wrote:
> 
> Hello,
> 
> There is an option --snap to the lvcreate utility to create a read-only snapshot(frozen image) of a volume.
> 
> Is there a possibility to quickly create a rw (read/write) snapshot of a logical volume ?

Beside other enhancements this is in 1.1-rcX which you can find
in CVS at www.sistina.com.

*** This is still in stabilization! Don't use it on production systems! ***

> 
> I'm thinking here of applications in the style of EMC Timefinder BCV's (bcv = business continuance volumes).
> 
> For example, I want to create a snapshot of a mounted volume running Informix.
> 
> The snapshot of the mounted logical volume will be inconsistent, but it appears then to contain a 'crashed' instance of Informix, and when mounting the snapshot, I'd like to replay logfiles (do a recovery on the crashed instance) for which I need read/write access to the snapshot ...

You can do this and other things (for eg.: full fsck on the writable snapshot
to check a filesystems integrity).

> 
> Thank you,
> David Stes.
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm sistina com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

-- 

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
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen Sistina com                           +49 2626 141200
                                                       FAX 924446
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