FreeBSD Security Survey
nospam at ugcs.caltech.edu
Mon May 22 09:14:38 PDT 2006
>From Doug Hardie <bc979 at lafn.org>, Sun, May 21, 2006 at 11:48:51PM -0700:
> Failover sounds good in theory but has significant issues in practice
> that make it sometimes worse than the alternative. Take mail
> spools. If you failover, mail the user saw before has disappeared.
> Then when you "fail back" it reappears and newer messages disappear.
> This is hardly unnoticable. My users do not find that at all
> acceptable. Putting the mail spools on a different machine just
> moves that problem to the different machine. Trying to keep multiple
> spools consistent has problems also. I have watched raid system lose
It's a hard problem that's why you buy a box to do it:
Rainfinity (recently bought by EMC) has patents on actual
peer-reviewed data-replication algorithms.
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