Re: spare server and data mirroring


Pawel Paron said:

Hi everybody,

I want to make a spare db server installation, for disaster recovery
purposes, and I'm looking for advices. Our present setup is a single HP-UX
machine, running IDS 7.31, all important filesystems and all database
chunks
are mirrored on two IBM disk arrays, placed in separate locations.
Mirroring
on the LVM level (no Informix mirrornig is used, OS is HP-UX 11.11). My
very
rough idea is to add a spare server in the remote location, install
Informix
software there, configure it to access appropriate filesystems and db
chunks, and leave it off, so in case of a disaster in the primary site I
could just start IDS on that spare server and have the database available
there. No clustering software is available, so switching will be done
manually. Does it look reasonable?

I'm concerned about data mirroring. If the primary site fails, so that
spare
server will be enabled and our work will be continued there, and later we
want to switch back to the primary site, will the data be synchronized in
the correct direction, from that remote copy to the local one? Is there
any
risk here, that it could go wrong way, and if so, what should take care of
to prevent against that? Is the LVM mirroring a safe solution to mirror a
database chunks?

Are there any licence issues, if the second server will never be up
together
with the first one, only one copy of the IDS software runnig at any given
time?

I know this is not a very clean idea, but I have to provide a solution
using
those available resources. Thanks in advance for any advices.

HDR is your friend.

--
Bye now,
Obnoxio

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