Lenovo ServeRAID M1115 User Manual page 19

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enterprise systems, and offers a cost-effective way to implement RAID in
a server.
SAS technology brings a wealth of options and flexibility with the use of
SAS devices and SATA devices within the same storage infrastructure.
However, SAS devices and SATA devices bring individual characteristics
that make each one a more suitable choice depending on your storage
needs. MegaRAID gives you the flexibility to combine these two similar
technologies on the same controller and within the same enclosure.
Note: You cannot mix SAS drives and SATA drives within the
same virtual disk(s).
The ServeRAID-M1115 controller is based on the MegaRAID
first-to-market SAS IC technology and proven technology. As a
second-generation PCI Express controller, it addresses the growing
demand for increased data throughput and scalability requirements
across midrange and enterprise-class server platforms. Lenovo offers a
family of SAS controllers to address the needs for both internal solutions
and external solutions.The controller supports the SAS protocol as
described in the Serial Attached SCSI Standard, version 3.0.
In addition, the controller supports the Serial ATA II (SATA II) and SATA
III protocols. The SATA III protocol is defined by the Serial ATA Revision
3.0, and the Serial ATA III; Extension to the Serial ATA Specification,
Version 2.0. SATA III is an extension to SATA 2.0.
Each port on the controller supports SAS devices and/or SATA devices
using the following:
•
SAS Serial SCSI Protocol (SSP), which enables communication with
other SAS devices
•
SATA, which enables communication with other SATA devices
•
Serial Management Protocol (SMP), which communicates topology
management information directly with an attached SAS expander
device
•
Serial Tunneling Protocol (STP), which enables communication with
a SATA device through an attached expander
Overview