The below KB will provide more information about the recommended cache settings for the CX4. The process to change the Read and Write cache settings is pretty easy - at the end of this KB there is a description of the steps needed. The important point is that when you disable Write cache the overall performance on the array will decrease and this will impact latency on all applications using the array. This is why it's recommended to do this during a slow period. The whole process only takes about 60 seconds. You can also check in the Help section for more information about setting the System Cache. Just open the Properties window and click on the Help button - that will bring up the specific Help for the screen your on.  [URL]  glen
Trying to run DB2 on SSD drives in a CX4-240. The drives are configured using 2 - RAID groups of RAID5 4 + 1 400GB SSD drives, which are allocated with 2 disk in one DAE and 3 in another and they are in BUS 0 Enclosure 0 and BUS 1 Enclosure 0. I have created 8 LUNS as META'S with 50GB in one RAID group and 50 in the other. The problem appears to be that DB2 is striping the IO across the LUNS and I also have these LUNS defined as striped META'S. The read and write ms response times are as high as 300 to 500 at times. I have tried all variations with cache both read and write enabled, just write, and none but this does not seem to make a difference. Would anyone have any suggestion on how to possibly improve this? Thanks
CX4 SSD Drives very high response times