Re: software or hardware raid?

[Chris Adams]

Once upon a time, George N. White III  said:
> Some data can be replaced, but there are also real-time data flows
> where data are lost forever when the system does down.  I recall a
> lost-of-data incident where the system was on UPS+ generator but
> IT hadn't received the replacement for a failed UPS battery in the
> network closet.

Lots of the time, UPSes and generators are not actively monitored and
tested.  An untested backup system is not a backup system, it's just
another point of failure!  I have seen failures of big UPSes,
generators, transfer switches... you name it, even if it is "redundant",
it can (and will) still fail.