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Changing cache option has a significant performance impact on Intel® RAID Controllers.
There are some adjustable Cache options and settings for each logical drive in Intel® RAID Controller: Cache Write Policy, Cache Policy and Read Policy. In order to optimize I/O performance, Intel suggests you to set the 3 settings as "Write Back," "Cached I/O" and "Read Ahead" simultaneously.
To avoid data lost, if there is a "Battery module is missing" or "Battery voltage low" warning during system boot-up, the RAID firmware will reset Write Policy to "Write Through" even if you set it to "Write Back" in BIOS RAID Console. In this situation, you can set Write Policy to "Write Back" temporarily in RAID Web console before you do a performance test.
Operation of the RAID controller in a production environment with the cache setting to "write back" without a battery backup module installed on the RAID controller is not recommended and may result in data loss in the event of a power interruption or other system related issue.
This applies to:
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