Re: Cache battery and Raid Controller Design WAS: Re: Rép. : Question of a Newbie to POWER Systems

It will. Or more likely, the RAID controller will without OS intervention
since it's really more of a hardware thing than an OS thing.

On top of idle time, there will also be a maximum amount of time that data
is allowed to stay in cache before a write is forced. While it doesn't
sound like much that max time is probably only a second or two.

On Wed, Mar 30, 2011 at 4:32 PM, Musselman, Paul <
pmusselman@xxxxxxxxxxxxxxxx> wrote:

Vern--

I agree that the battery is only to protect the cache memory.

My question is: won't OS/400 (i) write the cache back to disk during idle
moments, so that, on a mostly idle system, won't user data more likely than
not still be protected? I remember someone mumbling something about the
data in cache being flagged as 'clean' or 'dirty,' clean being written back,
and dirty not written back...

Paul E Musselman

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