Re: Mirroring HW vs Informix - follow up

} Jack, } } I would suggest that you check what hardware you are using. Normally } in hardware mirroring the same block of data is sent by the disk } controller board to both disks separately. This avoids the } possibility of a block being written and corrupted and then written to } the mirror. Informix mirroring is one step further of abstraction in } that it sends two separate pages to the disk controller to write to } the primary and the mirror separately. This is why hardware mirroring } is generally faster. } } Your description suggests that you may have a problem with your disk } controller rather than or as well as the drives. To have a corruption } written to both the primary and mirror suggests the possibility that } the corruption occured before the block left the disk controller. } } Cheers - Jim } My opinions are my own. They may vary with time but they remain MINE! } ---------------------------------------------------------------------- } Name: Jim Gordon Internet: jgordon@ssf-sys.DHL.COM } Company: DHL Systems Inc Phone: (415) 375-5222 (Work) } Address: 700 Airport Blvd. #300 (415) 775-7762 (Home) } Burlingame, CA 94010-1937 Fax: (415) 375-5019 } ---------------------------------------------------------------------- } I misstated - we did not use HW mirroring, but OS mirroring In this case the cause of the incident was software related. The OS bought it Online did not cheers j. _____________________________________________________________________________ Jack Parker | Hewlett Packard, BSMC Boise, Idaho, USA| "Discover America, jparker@hpbs2561.boi.hp.com | Get lost on a rally." (208) 396-5388 (W) (208) 384-1623 (H) | _____________________________________________________________________________ Any opinions expressed herein are my own and not those of my employers. _____________________________________________________________________________