MSI MS-96E0, Руководство пользователя

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LSI SAS RAID
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MS-96E0
B-7
LSI SAS RAID
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MS-96E0
2�4 Integrated Mirroring Firmware
This section describes features of the LSI Logic Integrated Mirroring (IM) firmware,
whch supports up to two IM volumes per LSI Logc SAS controller.
2�4�1 Host Interface
The IM host nterface uses the Message Passng Interface, as descrbed n the Fuson-
MPT Message Passing Interface Specification. Through the Fusion-MPT interface, the
host OS has access to the IM volume as well as the physcal dsks.
2�4�2 Resynchronization with Concurrent Host I/O Operation
The IM firmware allows Host I/Os to continue on the IM/IME volume while the volume
s beng re-synchronzed n the background. Resynchronzaton s attempted after a hot
spare s actvated due to a physcal devce falure, or after a hot swap has occurred to a
physcal dsk n the IM or IME volume.
2�4�3 Metadata Support
The firmware supports metadata, which describes the IM/IME logical drive configura -
tion stored on each member disk. When the firmware is initialized, each member disk is
queried to read the stored metadata in order to verify the configuration. The usable disk
space for each member dsk s adjusted down to leave room for ths data.
2�4�4 Hot Swapping
The IM firmware supports hot swapping. The hot-swapped disk is automatically resyn -
chronized in the background, without any host or user intervention. The firmware de -
tects hot swap removal and dsk nserton.
Following a hot swap event, the firmware readies the new physical disk by spinning it
up and verifying that it has enough capacity for the mirrored volume. The IM firmware
resynchronzes all hot-swapped dsks that have been removed, even f the same dsk
is re-inserted. In a two-disk mirrored volume, the IM firmware marks the hot-swapped
dsk as the secondary dsk and marks the other mrrored dsk as the prmary dsk. The
firmware resynchronizes all data from the primary disk onto the new secondary disk.
2�4�5 SMART Support
The IM firmware enables Mode 6 SMART on the member disks in the mirrored volume.
Mode 6 SMART requres each physcal dsk to be polled at regular ntervals. If a SMART
ASC/ASCQ code is detected on a physical disk in the volume, the firmware processes
the SMART data, and the last receved SMART ASC/ASCQ s stored n non-volatle
memory. The IM/IME volume does not support SMART drectly, snce t s just a logcal
representaton of the physcal dsks n the volume.
2�4�6 Hot Spare Disk
One disk can be configured as a global hot spare disk, which protects data on the one
or two volumes configured on the controller. If the IM firmware fails one of the mirrored
disks, the firmware automatically replaces it with the hot spare disk. The IM firmware
then resynchronizes the mirrored data. The IM firmware is automatically notified when