Re: Disk Layout and mirroring in 7.x

Erik A. Widholm wrote: > > We are currently installing a new 4-way K570 (HP) and will be moving our > database to it. My question is about mirroring: > > I have 5 Fast/Wide SCSI channels, 1 w/ 16GB (4 drives) and 4 w/ 32GB (8 > drives). Our database currently takes about 14 GB. With the OS (HP-UX > 10.20 using NFS), what is the recommended way to first separate the > database and OS (minimum of 9 dbspaces, 3 of which are hugely used) over > the chanels? > > Also, and more importantly: is it better to use the OS's disk mirroring > or Informix's own? If your platform supports hardware SCSI read/writes across the controllers, there's no comparison between Informix's mirroring and hardware mirroring. Hardware mirroring will be your best bet. One advantage I can think of using Informix mirroring in this case is the split reads across the mirrored disks, increasing the parallelism. You be the judge of the trade-off. But keep in mind Informix mirroring was not designed to be a substitute for hardware mirroring, but as a method when the hardware does not support mirroring. Good luck, Arun