Lenovo ServeRAID M5120, User Manual

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Benefits of the ServeRAID M5120 SAS/SATA Controller 1-9
Table 1.2 lists the array limitations for the ServeRAID-M5120 controller.
Note: The maximum number of hot spares per array is equal to
the maximum number of physical drives per array.
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 1.2
rather than by the actual RAID volume capacity.
The maximum numbers in Table 1.2 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 128 arrays per controller. In
addition, though you can have up to 16 virtual disks per array, and up to
128 arrays per controller, there is a limit of 64 virtual disks per controller.
1.6.3 SATA III Features
The following list describes the SATA III features of the ServeRAID
ServeRAID-M5120 controller:
•
Supports SATA III data transfers of 6.0 Gb/s
•
Supports STP data transfers of 3.0 Gb/s
•
Provides a serial, point-to-point storage interface
Table 1.2 ServeRAID M5120 SAS/SATA Controller Array
Limitations
Specification
ServeRAID M5120
SAS/SATA Controller
Maximum virtual disks per controller 64
Maximum arrays per controller 128
Maximum virtual disks per array 16
Maximum physical devices per array 32
Maximum physical devices per controller 240
Maximum hot spares per controller 240
Maximum spans per virtual disk 8
Maximum ports 2