topic Re: Smart Array Controller P400 cache ratio in ProLiant Servers (ML,DL,SL)

Smart Array Controller P400 cache ratio

_Yurgin — Tue, 12 Jun 2007 14:48:21 GMT

Hi

How can i change i/o cache ratio(standard ratio is 100% read and 0% write)?

Into ArrayConfigaration Tools only one ratio.
FirmWare is 2.08

Thanks

Re: Smart Array Controller P400 cache ratio

Rob Leadbeater — Tue, 12 Jun 2007 15:19:37 GMT

Hi,

To enable the write cache on a SmartArray controller you must have installed the BBWC (Battery Backed Write Cache) option.

Without it there is the possibility of data loss in the event of power failure, hence why you can't have any write cache.

Hope this helps,

Regards,

Rob

Re: Smart Array Controller P400 cache ratio

corNIC — Thu, 15 Mar 2012 20:39:12 GMT

Actually you can:

ctrl slot=0 modify nobatterywritecache=enable

ctrl slot=0 cacheratio=50/50

Re: Smart Array Controller P400 cache ratio

Goutham_Sabala — Fri, 16 Mar 2012 10:03:36 GMT

It can be changed in ACU - Array Configuration Utility however it can be done only if the controller has a battery-backed cache (because only battery-backed cache can be used for write cache) and if there are logical drives configured on the controller.

If bbwc is present this doc should be helpful ( though this is for old ACU version , setting should be similar on the new ACU version as well )

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=115&prodSeriesId=468780&prodTypeId=18964&objectID=c01146250