MSI X2-109 v2 - Manual (Page 110)

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M S-9265 Server
disk. The IM firmware then resynchronizes the mirrored data. The IM firmware
is automatically notified when the failed disk has been replaced, and the firm-
ware then designates that disk as the new hot spare.
2.4.7 M edia Verification
The IM firmware supports a background media verification feature that runs at
regular intervals when the IM/IME volume is in optimal mode. If the verification
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
Verification Logical Block Address is written to non-volatile memory occasion-
ally to allow Media Verification to continue approximately where it left off prior
to a power-cycle.
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.
2.4.9 NVSRAM Usage
For the LSISAS1064/1064E and LSISAS1068/1068E controllers, the IM firm-
ware 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.
2.5 Fusion-MPT Support
The BIOS uses the LSI Logic Fusion-MPT interface to communicate to the SAS con-
troller 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 communi-
cate with the controller and firmware.
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