Re: Aix Mirroring Vs Informix Mirroring

} } Jonathan Leffler (obelix.informix.com!johnl@emory.mathcs.emory.edu) wrote: } } : In general, operating system level mirroring and hardware mirroring are } : more efficient than Informix mirroring, if only because they can schedule } : writes to both the primary and the mirror disk concurrently, whereas } : Informix has to write to the primary and then write to the mirror. } } : When you don't have lower level mirroring, use Informix mirroring, but use } : a lower level mirroring system if you have a choice. These rules apply to } : version 4 or 5 -- they may need to be reconsidered with version 6, though I } : doubt it. } } This confuses me a little. We are using I-Online 4.1 with rootdbs mirrored } by Informix. Since Online handles raw partitions and does not use the } UNIX file system for accessing the data, how can operating system level } mirroring be used for Online? } } Maybe I'm having a terrible misconception here, please explain. } We have several engines, one or two use the OS mirroring - this is done by telling Online that there is no mirror and setting it up as a mirror of a raw device under the OS. We also use Online mirroring in several cases. Both seem to work fine - although since the sysadmin folks live somewhere else we seem have more control over the Informix mirroring than we do over the OS mirroring. j. _____________________________________________________________________________ Jack Parker - Contractor | Hewlett Packard, BSMC Boise, Idaho, USA| If you keep staring at it like that, jparker@hpbs2561.boi.hp.com | your nose is going to grow (208) 396-5388 (W) (208) 384-1623 (H) | into the bark. _____________________________________________________________________________