Univide UniWorkstation 5548, Руководство пользователя

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5.2.2.4.8 Disk Write Caching
The IM firmware disables disk write caching by default. This is done to increase data integrity, so that the disk
write log stored in NVSRAM is always valid. If disk write caching were enabled (not recommended), the disk write
log could be invalid.
5.2.2.4.9 NVSRAM Usage
For the LSISAS1064/1064E and LSISAS1068/1068E controllers, the IM firmware requires at least a 32K NVSRAM
in order to perform write journaling. Write journaling is used to verify that the mirrored disks in the IM/IME
volume are synchronized with each other.
5.2.2.5 Fusion-MPT Support
The BIOS uses the LSI Logic Fusion-MPT interface to communicate to the SAS controller and firmware to enable
Integrated Mirroring. This includes reading the Fusion-MPT configuration to gain access to the parameters that
are used to define behavior between the SAS controller and the devices connected to it. The Fusion-MPT drivers
for all supported operating systems implement the Fusion-MPT interface to communicate with the controller and
firmware.