On Fri, 2020-03-06 at 03:25 -0600, Ron wrote: > > RAC is not really a high availability solution: because of the shared > > storage, it has a sibgle point of failure. > > This is utter nonsense. Dual redundant storage controllers > connected to disks in RAID-10 configurations have been around for at > least 25 years. > > Oracle got it's clustering technology from DEC, and I know > that works. Cluster members, storage controllers and disks have all > gone down, while the database and application keep on humming along. I am not saying that it is buggy, it is limited by design. If you have mirrored disks, and you write junk (e.g, because of a flaw in a fibre channel cable, something I have witnessed), then you have two perfectly fine copies of the junk. I am not saying the (physical) disk is the single point of failure, the (logical) file system is (Oracle calls it ASM / tablespace, but it is still a file system). Yours, Laurenz Albe
