The controller knows (somehow) when the battery is weak and disables use of the cache
when this happens. It also reports at problem at this point so that you know to call
service. If your Disk units get abnormally busy and the system very slow then this is
one possibly condition. WRKPRB or QSYSOPR will both show the problem.

 - Larry

Marco Facchinetti wrote:

The system is not reporting any error (only the CPI091D
with error code 9 at IPL time two days ago). Is there a way
to test the battery?

Larry Bolhuis           | IBM Certified Solutions Expert
Vice President          |     iSeries Technology V5 R1
Arbor Solutions, Inc.   |     e-business for AS/400 V4 R2
(616) 451-2500          | IBM Certified Specialist  AS/400
(616) 451-2571 -fax     |     RPG IV Developer     |     System Administrator for OS/400 V4 R4          |     Professional Network Administrator
                        |       Network/Multiple Systems
                        |     Client Access

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