RE: chunk transplant

I thought Robert said his server OS mirrored the chunks, so if the hardware fail, he has other server with the same configuration and hardware able to bring on-line a new Ifx server by using the mirrored chunks. It works, but if the IDS get a unrecoverable crash, this schema wont work. But mirror is not necessary; you could take the disks to the other server or even better, you could have the disks, where the chunks are, connected to both servers, but activated only in one of course (you would need extra software). > -----Mensaje original----- > De: David Williams [SMTP:djw@smooth1.demon.co.uk] > Enviado el: Martes 16 de Enero de 2001 07:31 PM > Para: informix-list@iiug.org > Asunto: Re: chunk transplant > > In article <9422kf$k08$1@knight.vf.lmco.com>, Robert Carts > <rcarts@agccs.lmco.com> writes > >We have been investigating ways to keep data current on a local and > >identical backup server. We are aware of IER and HDR. My boss suggested > >that we keep a mirrored chunk on a cross mounted drive that resides on > the > >backup server. Then in the event of a failure of the primary server, > bring > >the backup server online using the primary servers chunk. I skeptically > >attempted this and it worked! > > > >The conditions are: The schemas, database spaces, chunk size and number > of > >chunks are the same on both servers. The chunks use cooked files. The > >databases are created in rootdbs and the tables, indexes are created in > >dedicated chunks. The chunks from the primary server are copied over the > >backup server chunk files before the backup instance is brought online. > We > > ?? If the primary server is down how can you do the copy? > > I'm not sure I follow, take the root dbspace as an example. What > chunks are on each machine. What is the copying which is done? > > > >are using 9.2uc3 on solaris 2.7. > > > >Question: Under what conditions would this not work (within the > conditions > >above) ? I either need to demonstrate why not to use the technique or > make > >it work reliably? > > > >Thanks, Bob Carts > > > > > > -- > David Williams