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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: For optimal performance with a majority of applications, Intel suggests the following cache options:
Write Policy: Write Back
Read Policy: Adaptive Read Ahead
Cache Policy: Direct I/O
To avoid data loss, the RAID firmware will change Write Policy to "Write Through" whenever a backup battery unit is not present or does not have sufficient level of charge. To prevent this from happening you can uncheck Write Through for failed or missing BBU option.
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.
For more details regarding performance measurement, cache options, and other settings affecting performance please refer to Configuring RAID for Optimal Performance whitepaper.
This applies to:
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