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TD_DEV245 20 posts Joined 08/12
12 Oct 2012
re:RAID AND FALLBACK

Hi,
  What is the need for having FALLBACK option during creating Tables when we have RAID-1 which has a mirror copy of a disk.doesnt it add overhead and cost?
Thanks,
Vijayshankar

''Human race acts as though comfort and luxury were the chief requirements of life, when all that we need to make us happy is something to be enthusiastic about''-Albert Einstein
Jim Chapman 449 posts Joined 09/04
12 Oct 2012

Fallback does add overhead and cost.  The value is an additional level of protection.  If an AMP goes offline for some reason, a fallback-protected table is still accessible.  Fallback also provides a means of recovery from data corruption due to software or CPU faults that RAID controllers cannot detect.

TD_DEV245 20 posts Joined 08/12
15 Oct 2012

Thanks a lot for the reply

''Human race acts as though comfort and luxury were the chief requirements of life, when all that we need to make us happy is something to be enthusiastic about''-Albert Einstein

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