"Hanasaki" == Hanasaki JiJi <[EMAIL PROTECTED]> writes:
Hanasaki> Any input on building systems that support hotswap and 5
Hanasaki> 9's uptime? What hardware? drivers? where to get them?
Hanasaki> costs?
5 9's == 315 seconds of downtime per year. I have spent all my
professional life designing such systems on various Unices. There is
no simple input. The architectures are always application based. Drop
to 4 nines and life is a lot easier and much, much cheaper. Most of
the cost is also in ordinary things like physical security, power grid
connections, and operator training.
Remember that 315 seconds includes time to upgrade software to fix
bugs, to maintain hardware, backup databases etc. For example, if you
have write databases as part of the service you are providing, and you
want to backup you are not allowed to turn off updates for more than
315 seconds in one year. So be sure you can dump your transaction log
to tape in a fraction of that if you want to be caught up on backups
(or choose a database architecture that solves the problem otherwise).
I would recommend that you go for *network* architecture that provides
five 9's availability rather than try to design a single cluster that
does the same. But that, again, is an application specific decision.
Good luck.
Cheers!
Shyamal
--
To UNSUBSCRIBE, email to [EMAIL PROTECTED]
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
