If you have ever had 3ware cards underperforming before you have probably found out about the storsave profile and how it can effect performance of your RAID array.
Changing your storsave profile can easily be done on the fly without rebooting your server by using the tw_cli utility.
tw_cli /c0/u0 set storsave=balance
Where c0 is the RAID card, and u0 is the array you wish to change the profile for. There are 3 profiles, protect which is the slowest and most secure. Balanced which you should be using if you have a BBU on the RAID card, and then finally performance which doesn’t even use the BBU even if you have one! We set our arrays to balanced when we use a BBU
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