Owner's Manual
B-8
LSI SAS RAID
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MS-96E0
LSI SAS RAID
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MS-96E0
the failed disk has been replaced, and the rmware then designates that disk as the
new hot spare.
2.4.7 Media Verication
The IM rmware supports a background media verication feature that runs at regular
intervals when the IM/IME volume is in optimal mode. If the verication command fails
for any reason, the other disk’s data for this segment is read and written to the failing
disk in an attempt to refresh the data. The current Media Verication Logical Block
Address is written to non-volatile memory occasionally to allow Media Verication to
continue approximately where it left off prior to a power-cycle.
2�4�8 Disk Write Caching
The IM rmware 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 cach-
ing were enabled (not recommended), the disk write log could be invalid.
2�4�9 NVSRAM Usage
For the LSISAS1064/1064E and LSISAS1068/1068E controllers, the IM rmware re-
quires 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.
2�5 Fusion-MPT Support
The BIOS uses the LSI Logic Fusion-MPT interface to communicate to the SAS control-
ler and rmware to enable Integrated Mirroring. This includes reading the Fusion-MPT
conguration to gain access to the parameters that are used to dene behavior between
the SAS controller and the devices connected to it. The Fusion-MPT drivers for all sup-
ported operating systems implement the Fusion-MPT interface to communicate with the
controller and rmware.