Re: Slow AS400 performance

["Colin Williams" <colinwilliams007@xxxxxxxxx>]

I have no idea about the design of these controllers,

but presumably if they are there as battery backup in the event of a power
failure, to ensure that all writes go to disk,

why do they affect performance if they die whilst mains power is available?
Why cant these controllers just use mains power whilst its available?


On 20/04/06, Wilt, Charles <CWilt@xxxxxxxxxxxx> wrote:
>
> Colin, the batteries being discussed are on the DASD controller.
>
> Since the controllers have a write cache, you'd face serious corruption
> issues if the power failed prior to flushing the cache to disk.
>
> Thus, the reason the system turns off the cache when the battery reaches
> its end of life.  Not having the cache turned on causes the performance
> degradation people will notice.
>
> Charles Wilt
> --
> iSeries Systems Administrator / Developer
> Mitsubishi Electric Automotive America
> ph: 513-573-4343
> fax: 513-398-1121
>
>
> > -----Original Message-----
> > From: midrange-l-bounces@xxxxxxxxxxxx
> > [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Colin Williams
> > Sent: Thursday, April 20, 2006 3:49 PM
> > To: Midrange Systems Technical Discussion
> > Subject: Re: Slow AS400 performance
> >
> > Am I the only one wondering why an as400 would need batteries?
> >
> > I can understand the need for them as a backup, or for
> > retaining config
> > values, but for normal use in hardware?
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