641 Card and Battery

[HTT_1]

I have a DL380 G4 with a 641 card. Currently the card is set at 100% Read/ 0% Write causing slow write. There is no option to change this RW ratio in ACU so I assume there is no onboard battery and I can buy a battery so I can change the RW ration. Am I correct? Attached is a screenshot of the ACU. Thanks.

[BenS]

You are correct, you need a battery backed write cache enabler kit in order to enable write cache. The battery comes as part of this kit, which also includes a transportable memory module that allows you to transport the write cache to a new controller in the event of controller failure.

http://h18000.www1.hp.com/products/quickspecs/12067_na/12067_na.HTML

Thr part number for the 128MB BBWC Enabler kit is 351580-B21 (as is stated in the above document)

[Taifur · Accepted solution]

Hi HTT,

You need battery whhich is battery back write cache (BBWC) to increase RW ratio.
The 128MB BBWC Enabler is a transportable 128MB battery module increasing the total memory of the controller to 192MB for RAID, read cache, and BBWC.
128MB BBWC (Battery Backed Write Cache) Enabler allows the 641/642 controllers an option to add transportable BBWC for improved controller performance and increases the total controller memory to 192MB.

Check below link for detail about BBWC
http://www.ciao.co.uk/Hewlett_Packard_128_MB_DRAM__5775539

http://www.pricebat.ca/HP-SA641-642-128MB-BBWC-Enabler.p_136896/

If it helps, pls assign point.

Rgds//
Taifur