RE: i5 cache battery - anyone replace on the fly?

From what I understand, cache batteries on the 2780 IOA can swell due to

heat. So, even though they are designed for concurrent replacement, it
isn't always possible to remove the battery pack without first removing
the card.

That said, we recently replaced ~30 of these on our system concurrently,
without issue.

Steve


------------------------------


date: Mon, 6 Oct 2008 12:49:54 -0500
from: "Paul E. Fenstermacher" <paulf@xxxxxxxxxxx>
subject: RE: i5 cache battery - anyone replace on the fly?

My CE always tells me it can be replaced concurrently but the next thing
he says is that he doesn't recommend it. Considering the consequences
of losing the cache I error on the side of caution every time.

Paul Fenstermacher
Certified Specialist - i5 System Administration
Bass Pro Shops
417-873-5424 d
417-429-7694 c
paulf@xxxxxxxxxxx


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jeff Crosby
Sent: Monday, October 06, 2008 8:25 AM
To: Midrange Systems Technical Discussion
Subject: i5 cache battery - anyone replace on the fly?

All,

3:30am Sunday one of the cache batteries in the System i failed. (Never

mind that I check them the first of every month, which was last week,
and there were no impending warnings, let alone failures. But that's
another issue.)

The CE will be here at 1:30pm to replace it. There a _possibility_ it
can be done without shutting down the system. The CE (not our usual
one) said he will not know for sure until he gets here. STRSST shows
this for that battery:

Battery Information

Resource name . . . . . . . . . . . : DC06
Serial number . . . . . . . . . . . : 09-4352085
Actual type-model . . . . . . . . . : 2780-001
Unit ID . . . . . . . . . . . . . . : U0595.001.103875E
Planar ID . . . . . . . . . . . . . : CB1
Card . . . . . . . . . . . . . . . : C08
Battery type . . . . . . . . . . . : Lithium Ion (LiIon)
Battery state . . . . . . . . . . . : Error condition
Power-on time (days) . . . . . . . : 149
Adjusted power-on time (days) . . . : 175
Estimated time to warning (days) . : 0
Estimated time to error (days) . . : 0
Concurrently maintainable
battery pack . . . . . . . . . . .: Yes
Battery pack can be safely replaced : Yes

The other cache battery in our System i does _not_ say it is
concurrently maintainable. It's a type/model of 5709-001 NiMH.

My question is this: Has anyone actually replaced one of these on the
fly? And it worked?

Thanks.