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IDS Forum

Re: Informix 12.10 snapshot

Posted By: Fernando Nunes
Date: Thursday, 4 December 2014, at 3:08 p.m.

In Response To: Informix 12.10 snapshot (GEORGI KOSTOV)

Yes... but doing that on the same machine is risky... There's a high chance
that someday you or someone else will make a mistake and you'll get into
trouble...
In order to do that on another machine you just need to connect the
snapshot image to that machine, create the links for the chunks and then
issue an external restore. Simple.

But to do that in the same machine you need to combine the external restore
with the chunk rename. That's also simple. What's the big deal?... If for
example you add a new chunk and forget to add it to the rename file (or
command, but if your instance is big you won't specify all the chunks in
the command line) then the "other" instance will not bother and will use
the original instance path for that chunk... yes, it's that bad... two
instances over the same chunk.... not a pretty scenario.
So, the functionality exists... but the risk is your's. I think it would be
better to create a separate virtual machine, make sure the snapshot chunks
can only be seen by that machine, assure that machine cannot see the
"primary" chunks and work from there. It's a bit more complex, but much
more safe. If you miss a chunk than the "second" instance will not start or
you'll have a down chunk, but the "primary" is safe.

Hope this helps. If I missed the point, please say so.
Regards.

On Thu, Dec 4, 2014 at 5:26 PM, GEORGI KOSTOV <gkostov79@gmail.com> wrote:

> Hi all,
> I want to ask is it possible to use SAN snapshot functionality to clone my
> Informix 12.10 server?
> I want to make clone of my server every night and to have "fresh" copy of
> the
> instance in the morning on 2 other instances - one on same host and one to
> another host for backup and development purposes.
> I do my snapshot with onmode -c block/unblock then storage snapshot - my
> question is can I bring other servers with this snapshot.
> Is it posible to have problems with root dbspace?
> PS.my database is too big to make backups and restore with onbar or ontape.
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--
Fernando Nunes
Portugal

http://informix-technology.blogspot.com
My email works... but I don't check it frequently...

--20cf301d41a28e58b805096985df

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