That is the battery pack for the cache module.  Without that module the controller is a Perc3/DC Lite.  This means that you can use the read cache, but not the write cache.

That's interesting. From the pcitures I've seen i had assumed that was what it was. But i took the DIMM out and there was a battery mounted onto the back of the DIMM module.

Have I got a different controller than what I thought I'd bought? The controller is marked as being a 9M912 which i believe is a PERC3/DC.

Here are a couple of pictures of the offending item.

well would do if i knew how to entr links properly !

Message Edited by Doug Clark on 09-13-200603:10 PM

The part # you supplied is for the PERC 3/DC.

Well now I'v ehad a chance to stick it in a server and things dont look to good. The server recognises the device on boot up ans displays the PERC title page with BIOS revison (3.17)
Then does:

Initializing

Scanning for devices

Reading Configuration

Where it pauses for quite some time and eventually comes back with

Adapter at Range F000H is not responding
No adapter

I guess this means it knackered, unless there is a way of resetting it?