IBM Redbooks ServeRAID-MR10i, User Manual

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ServeRAID-MR10i SAS/SATA Controller Description 1-3
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Serial Tunneling Protocol (STP), which enables communication with
a SATA II device through an attached expander
1.2 ServeRAID-MR10i SAS/SATA Controller Description
The ServeRAID-MR10i controller is available with eight PHYs. The
controller has one LSISAS1078 ROC (RAID-on-chip) processor that
controls eight internal SAS/SATA ports through two SAS x8 internal
connectors.
1.2.1 Controller Limitations
The ServeRAID-MR10i controller has the following limitations:
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You can connect only one device per SAS PHY unless you use an
expander
•
You can use a maximum cable length of six feet (using shorter
cables is preferred)
•
Cables have to meet the SAS specification
•
You cannot use SAS drives and SATA drives in the same virtual disk
•
You cannot mix SAS or SATA Solid State Drives (SSDs) and legacy
mechanical drives (SAS or SATA) in the same virtual disk
•
You cannot mix Solid State Drives and Solid State SATA Drives in
the same virtual disk
•
See Section 3.3.4, “Electrical Characteristics,” for information about
the power requirements, and Section 3.3.5, “Operating and Non-
operating Conditions” for information about the minimum and
maximum temperature ranges
1.3 General Description
The ServeRAID-MR10i controller brings 3.0 Gbit/s Serial Attached SCSI
and 3.0 Gbit/s Serial ATA II performance to host adapter, workstation,
and server designs. The controller supports internal storage devices,
which allows you to use a system that supports enterprise-class SAS
drives and desktop-class SATA II drives. Each ServeRAID-MR10i