Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 29)

Monitoring, Maintenance, and Troubleshooting Features
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includes a typical read-ahead caching method which is used to proactively
retrieve data from media and store it locally on the controller with the
anticipation that it may be requested by the host. By default read cache is
set to the Intelligent mode. For more information, see “Working with
Read Cache Settings” on page 104.
• Write Cache . You can enable or disable write cache using 3BM, 3DM2,
and CLI. When write cache is enabled, data will be stored in 3ware
controller cache and drive cache before the data is committed to disk.
This allows the system to process multiple write commands at the same
time, thus improving performance. However when data is stored in cache,
it could be lost if a power failure occurs. With a battery backup unit
(BBU) installed, the data stored on the 3ware controller can be restored.
(For more information, see “Enabling and Disabling the Unit Write
Cache” on page 102.