RE: i5 Cache Battery

The reason it effected performance was due to all writes to disk were

direct instead of buffered, which apparently makes a pretty big difference.

Forgive my ignorance on the subject, but would that be one of the benefits
to iSeries I/O vs. regular PC IDE drives?  That being they have buffered
mechanisms built into both the hardware and OS/400 that provide significant
performance increases.  When the cache battery dies is one experiencing I/O
performance similar to what a PC IDE HD would give?

I am always looking for additional "one ups" that the iSeries has over other
platforms :-)

Aaron Bartell
http://mowyourlawn.com

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Ron Adams
Sent: Friday, December 29, 2006 9:01 AM
To: Midrange Systems Technical Discussion
Subject: Re: i5 Cache Battery

Incidentally, if the cache battery fails, or for some strange reason you
miss the warning message, system performance will be seriously degraded. We
had this happen a couple of weeks ago and it messed everything up. Jobs that
previously ran in 1 or 2 minutes were taking 20-30 minutes. I struggled with
the issue for almost a week until I stumbled upon it accidentally when doing
a WRKDSKSTS and noticed the protection status was "DEGRADED". The reason it
effected performance was due to all writes to disk were direct instead of
buffered, which apparently makes a pretty big difference.
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