Re: CACHE BATT EXP 90 DAYS???

[Larry Bolhuis <lbolhuis@xxxxxxxxxx>]

We are seeing large systems go to Mirroring more and more but even some 
small systems. The problem of course is that as you increase the number 
of loops, buses, cards, power supplies and drives you statistically 
increase the chances of a failure. It's also normally true that the 
larger the system the more people there are that depend on it and 
therefore the cost for it to be down is higher.  So it becomes more and 
more important to mirror (correctly I might add!) than to RAID your 
disks as the systems get larger. You don't reduce the chance of a 
failure but you reduce the chances that a failure will hurt. Poorly done 
mirroring only costs you more hardware and affords little additional 
protection.

- Larry

ChadB@xxxxxxxxxxxxxxxxxxxx wrote:
> Maybe with some serious mirroring design way up the bus level... is that
> common on big systems?
>
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>              06/04/2007 09:26                                      Subject 
>              AM                        RE: CACHE BATT EXP 90 DAYS???       
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> Why wouldn't it?
>
> Rob Berendt
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