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Cache battery has two stages: first is a warning that the battery life
will end soon, but the system still uses it.

Next it tells you the battery "died" and the disk become degraded.

In the first case you need a console the "kill" the rest of life of the
battery before you remove it, in the second case it is already out of
use and can be replaced without any console procedure.  Depending on the
machine model you need to turn it off (PWR DWN SYS) or change it "hot".


On 08/25/2017 09:40 AM, Justin Taylor wrote:
That disagrees with my experience six days ago.


-----Original Message-----
From: Jim Oberholtzer [mailto:midrangel@xxxxxxxxxxxxxxxxx]
Sent: Friday, August 25, 2017 8:02 AM
To: 'Midrange Systems Technical Discussion' <midrange-l@xxxxxxxxxxxx>
Subject: RE: Cache Battery

Jerry:

The CE needs to take the system to a restricted state, and will most likely power down the system, that's the reason for needing the console. That's to be sure the cache is cleared before the batteries are changed. Besides that I'll bet that card controls all the DASD (or at least the load source) so, when the card is pulled to change the battery, the system will go down hard anyway if it's not brought down nicely.

Yes, a console is a requirement.

DEGRADED most likely means the cache is turned off due to the days count on
the batteries. System runs but very slowly.
--
Jim Oberholtzer
Agile Technology Architects





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