Re: spare server and data mirroring
Pawel Paron wrote: > Hi everybody, Why not use HDR and have a live ready to go server which the failover and recover schenarios all laid out by IBM already? It's fast, it's reliable, and it's safe. Also, Informix did not charge additional licensing fees for a backup-only HDR site machine unless you are actively using it for read-only reporting while the primary is also online. IB IBM is following the same policy. Art S. Kagel > 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. > > Regards > Pawe