[linux-lvm] Snapshot validity

[linux-lvm] Snapshot validity

[sachin]

Hi All

I have a question.
What happen if i have change the configuration of the snapshot origin volume
i.e i may change the size of the volume .Is the snapshot is valid or its of
no use

What i think is data is of no use ,because internally the driver may
checking the
extent mapping of the origin of the  snapshot and then it scanning the
ioexception table
i.e COW table .If my assumption is not correct ,If any one knows the actual
working
Please tell  me .

Thanks
SachiN_

Re: [linux-lvm] Snapshot validity

[Joe Thornber]

On Fri, Feb 27, 2004 at 11:52:45AM -0800, sachin wrote:
> Hi All
> 
> I have a question.

LVM1 or LVM2 ?

- Joe

[linux-lvm] Snapshot validity

[sachin]

> Hi All
>
> I have a question.

LVM1 or LVM2 ?

- Joe

Hi All

I am using lvm1

-SachiN_

_==__==__==__==__==__==__==_

Original messagel was


Hi All

I have a question.
What happen if i have change the configuration of the snapshot origin volume
i.e i may change the size of the volume .Is the snapshot is valid or its of
no use

What i think is data is of no use ,because internally the driver may
checking the
extent mapping of the origin of the  snapshot and then it scanning the
ioexception table
i.e COW table .If my assumption is not correct ,If any one knows the actual
working
Please tell  me .

Thanks
SachiN_

Re: [linux-lvm] Snapshot validity

[Heinz Mauelshagen]

Sachin,

you can resize original logical volumes and their snapshots
and they stay valid.

Regards,
Heinz    -- The LVM Guy --


On Mon, Mar 01, 2004 at 10:02:17AM -0800, sachin wrote:
> 
> > Hi All
> >
> > I have a question.
> 
> LVM1 or LVM2 ?
> 
> - Joe
> 
> Hi All
> 
> I am using lvm1
> 
> -SachiN_
> 
> _==__==__==__==__==__==__==_
> 
> Original messagel was
> 
> 
> Hi All
> 
> I have a question.
> What happen if i have change the configuration of the snapshot origin volume
> i.e i may change the size of the volume .Is the snapshot is valid or its of
> no use
> 
> What i think is data is of no use ,because internally the driver may
> checking the
> extent mapping of the origin of the  snapshot and then it scanning the
> ioexception table
> i.e COW table .If my assumption is not correct ,If any one knows the actual
> working
> Please tell  me .
> 
> Thanks
> SachiN_
> 
> _______________________________________________
> 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/

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

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@RedHat.com                            +49 2626 141200
                                                       FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] Snapshot validity

[Joe Thornber]

On Mon, Mar 01, 2004 at 02:20:47PM +0100, Heinz Mauelshagen wrote:
> 
> Sachin,
> 
> you can resize original logical volumes and their snapshots
> and they stay valid.

This scenario worries me:

- create a snapshot
- exceptions are triggered on the back half of the volume
- shrink volume to half its size
- use recovered space from back half for something else temporarily
- extend origin back to the old size

How does LVM1 deal with this ?

- Joe

[linux-lvm] Snapshot validity

[sachin]

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> Hi All
> 
> I have a question.

LVM1 or LVM2 ?

- Joe

Hi All 

I am using lvm1

-SachiN_

_==__==__==__==__==__==__==_

Original messagel was 


Hi All

I have a question.
What happen if i have change the configuration of the snapshot origin volume
i.e i may change the size of the volume .Is the snapshot is valid or its of
no use

What i think is data is of no use ,because internally the driver may
checking the
extent mapping of the origin of the  snapshot and then it scanning the
ioexception table
i.e COW table .If my assumption is not correct ,If any one knows the actual
working
Please tell  me .

Thanks
SachiN_




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