IBM ServeRAID M1215 SAS, Руководство пользователя

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ServeRAID M1215 SAS/SATA Controller for IBM System x User’s Guide Chapter 1: Overview
Benefits of the ServeRAID M1215 SAS/SATA Controller
The controller supports 64-bit logical block addressing (LBA), which makes it possible to connect a large number of
drives to the RAID controller, directly and through expanders. However, the actual number of drives that you can
attach depends on the limits listed in
Table 2 rather than by the actual RAID volume capacity.
The maximum drive numbers in Table 3 depend on how many physical devices you have connected to the controller.
For example, the maximum number of arrays per controller is equal to the number of physical disks supported by the
controller up to the limit of 32 arrays per controller. In addition, though you can have up to 16 virtual disks per array,
and up to 32 arrays per controller, the controller supports a limit of 32 virtual disks.
1.5.3 SATA III Features
The following list describes the SATA III features of the ServeRAID M1215 controller:

Supports SATA III data transfers of 6.0 Gb/s
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Supports STP data transfers of 3.0 Gb/s

Provides a serial, point-to-point storage interface

Simplifies cabling between devices

Eliminates the master-slave construction used in parallel ATA

Allows addressing of multiple SATA III targets through an expander

Displays activity and fault indicators for each PHY
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Supports Port Selector (for dual-port drives)

Each port on the controller supports SAS devices, SATA devices, or both using SSP, SMP, STP, and SATA.

Enables the controller to communicate with other SATA devices.
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Supports staggered spin-up

Supports hot plug
1.5.4 PCI Express Performance
The following list describes the PCI Express performance features of the ServeRAID M1215 controller:

Provides a PCI Express 3.0 interface that:
—
Supports a dedicated PCI Express bus
—
Supports x8 lane configuration
—
Supports transfer rates of up to 8 GT/s (1 GB/s) per lane
—
Complies with the PCI Express Specification, Revision 3.0

Provides unequaled performance through the Fusion-MPT architecture

Provides high throughput and low CPU utilization to offload the host processor
1.5.5 Usability Features
The following list describes the usability features of the ServeRAID M1215 controller:

Simplifies cabling with point-to-point, serial architecture

Supports smaller, thinner cables that do not restrict airflow

Provides drive spin-up sequencing control

Provides up to two LED signals for each PHY to indicate link activity and faults

Provides an I2C interface for enclosure management

Supports the external SAS Sideband signal SFF-8485 and SFF-8448 (SGPIO) standards.