Re: RAID Device

Hi there li@inetgw.fsc.ibm.com (Diana Li) wrote: >We are running Informix 7.10 on AIX. The databases are on raw device >created via LVM on RAID devices. We chose to use RAID for not have to >worry about media failure and down time to do a recovery. > >Can we totally trust RAID for no media failure therefore not doing >continuous log backup ? > >Also what about Informix data consistency failure (data corruption) ? >has anyone experienced this and what's the statistics on how often it >occurs ? > >The bottom line question is For RAID Device, Do We Still Need to Run >Full Archive Plus Continuous Log BackUp ? > >The system is OLTP and cannot afford to loose any data. > >Thanks for any response. > >Diana > We are using RAID 5 on our RS6000, the Data is Mission critical. We do Archives and continuous Log Backup to a remote location for the following raesons: 1. physical destruction of HW (even though the hardware is in a vault) 2. Software Errors of any kind (Informix, and Application) [this happens] (point in time restore [Tech Supp can do this]) 3. Unnoticed write Error ? (i am not sure if this happens) 4. What if two disks fail simultaneously ===> DATA LOSS (the whole Volume Group). This happened to us, when a technitian made an Error while replacing one defective disk (luckily this RAID only contained archives). so long Andreas Zeugswetter Sparkassen Datendienst AG&CoKG AUSTRIA Vienna