Re: Mirroring Alternatives HP-UX

In article <6vu9iq$ra7$1@news.xmission.com>, dbruce@us.dhl.com (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. The unofficial line from ITS used to be hardware mirroring was better than Informix mirroring which was better than OS mirroring. Personally I don't think there's much to choose between OS and Informix mirroring, but given the choice I always use hardware mirroring Paul Watson # I don't suffer from WF Software Ltd. # stress, I'm just Tel. (+44) 1436 674729 # a carrier Fax. (+44) 1436 678693 # www.wfsoftware.co.uk