Purpose of battery in perc5/i controller

Tue Mar 4 02:30:07 CST 2008

On Mon, Mar 03, 2008 at 10:47:37PM +0100, Sander Steffann wrote:
>   But, IMHO, it will work correctly only when your harddrive write cache is disabled, which will slow down the disks.
>   (there is up to 32MB of HDD's cache and when power goes down, cached data will be lost)
> 
>   Correct me if  i'm wrong

> The controller can only remove write-information from its cache when
> the harddisk has committed the data to 'safe' storage. If the disk
> lies to the controller (by using a write-back cache) then yes, this
> will not be reliable. Everything has to work together to keep it
> reliable. Maybe we need disks with their own batteries for their
> cache...

I'd assume that the controller takes care of this and disables write
caching for it's drives. 

But that's only my guess from a perfect world. ;->

Bye,

Tino.

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