On 3/6/20 8:55 AM, Laurenz Albe wrote:
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.
Why do you have just one FC path?
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).
Why isn't the filesystem (or RDBMS) throwing checksum errors? This was
standard stuff in legacy Enterprise RDBMSs 20 years ago.
--
Angular momentum makes the world go 'round.
