Re: Mirroring Alternatives HP-UX

David Bruce wrote: > We are having the discussion on what is better - OS mirroring vs Informix > mirroring. We are trying to establish a standard across all the instances and would > like input on what other shops have standardized on and what they see as the > benefits. Are goal is to maintain good performance while being able to have minimum > down time and point-in-time recoverability. > > We have a mixed environment with RAID stripped volumes and RAID 0+1 volumes. All > database spaces will be mirrored. We have read the Admin. Guide and the Performance > Tuning Guide, but no clear decision on which way to go. Some believe the OS > mirroring gives 10% better performance, but the Admin. Guide states you need > Informix mirroring allowes the server to do split reads to improve read performance. > > So is there a right answer? If not what factors need to be evaluated to determine > the best solution for performance? Other reference locations would also be > appreciated. > > -- > R/ > David S. Bruce > _____________________________________________________________ If you got the choice between OS mirroring disks by OS (HPUX 10.20) or informix (IDS 9.14UC1), choose OS mirroring because of the following reasons: - OS mirroring is in my experience >10% faster during very heavy write accesses - OS mirroring is much more stable: Our 9.14 server is up since more than 3 months and it is also absolutely stable concerning the use of memory. When we tested informix mirroring the server (9.13) crashes at least twice a week and its used memory increases 2% - 5% a day, only if mirroring was enabled. Erik Erik Vellmete MLP Consult GmbH Im Breitspiel 11 D-69126 Heidelberg email: mailto:erik.vellmete@mlp-ag.com