Re: Does mirroring slow down Backups?

> > > Fellow Informix'ers, > > We have a database that uses Raw disks wit some blob chunks. This db > is completely mirrored, and backups on this DB are really slow. There is > another installation which is similar, except no mirroring. Backups at that > site seem to be almost twice as fast. > > Does mirroring indeed slow down the backup (and the restore) process? You don't mention whether or not you are talking about Informix mirroring (pre DSA releases) or operating system level mirroring. If the operating system is doing the mirroring, it actually speeds up the backups, because reads can occur off either the primary or mirror drive. As a side note, I believe that when backups are occuring in a blob space, all modifications to those blobs are halted until the blobspace is completely archived. For this reason, we do not place our (text) blobs in blobspaces. Please tell us a little more about your hardware and software versions. I'm assuming tape bandwidth are Informix versions are the same at both sites. -- Naomi Walker (aka N7FSA) | naomi@anasazi.com | Phoenix, Arizona ---------------------------------------------------------------------- It's almost impossible to overestimate the unimportance of most things.