LSI SATA 150 - Manual (Page 16)

1-2 Introduction
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management capabilities. The SATA 150-6 supports RAID 0, 1, 5,
10, and 50.
•
The MegaRAID SATA 150-4 intelligent RAID controller and storage
adapter uses two Silicon Image SiI3112A chips to support four Serial
ATA ports. The Intel 80302 processor provides the intelligent RAID
management capabilities. The SATA 150-4 supports RAID 0, 1, 5,
and 10.
•
The MegaRAID SATA 150-2 RAID controller and storage adapter
uses a Silicon Image SiI3112A chip to support two Serial ATA ports.
The SATA 150-2 supports RAID 0 and 1.
1.1.1 Enclosure Management
The SATA 150-4 and SATA 150-6 controllers support enclosure
management through the same protocols used for SCSI Accessed Fault-
Tolerant Enclosures (SAF-TE), using an I
2
C interface to communicate
with the storage enclosure processor. This feature allows you to use
RAID capabilities provided by the SATA 150 adapters in an enclosure
containing your hard drives.
1.1.2 Patrol Read
The Patrol Read operation reviews your system for possible physical disk
errors that could lead to physical disk failure, and then carries out actions
to correct the errors. The goal is to protect data integrity by detecting
physical disk failure before the failure can damage data. The corrective
actions depend on the disk array configuration and type of errors.
Note: Patrol Read is a background operation and is designed to
minimize the impact on I/O performance.
1.1.3 SMART Technology
The self-monitoring analysis and reporting technology (SMART) feature
monitors the internal performance of all motors, heads, and physical disk
electronics to detect predictable physical disk failures. This feature helps
monitor physical disk performance and reliability, and protects the data
on the physical disk. When problems are detected on a physical disk,
you can replace or repair the physical disk without losing any data.