IBM ServeRAID M5014, User Manual

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Benefits of the ServeRAID M5014 and ServeRAID M5015 Controllers 1-13
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Provides drive spin-up sequencing control
•
Provides up to two LED signals for each PHY to indicate link activity
and faults
•
Provides an I
2
C interface for enclosure management
•
Supports the external SAS Sideband signal SFF-8485 (SGPIO)
interface
1.6.6 Flexibility Features
These features increase the flexibility of the ServeRAID M5014 and
ServeRAID M5015 controllers:
•
Supports a Flash ROM interface, a nonvolatile static RAM
(NVSRAM) interface, and a pipelined synchronous burst SRAM
(PSBRAM) interface
•
Offers a flexible programming interface to tune I/O performance
•
Allows mixed connections to SAS targets or SATA II targets
•
Leverages compatible connectors for SAS connections and SATA II
connections
•
Allows grouping of up to four PHYs in a single quad port to form a
wide port
•
Allows programming of the World Wide Name
1.6.7 Drive Roaming
Drive roaming occurs when the physical disks are changed to different
ports on the same controller. When the drives are placed on different
channels, the controller detects the RAID configuration from the
configuration data on the drives.
Note: In a clustering environment, drive roaming is supported
within the same channel only.
Configuration data is saved in both the NVRAM on the RAID controller
and on the drives attached to the controller. This action maintains the
integrity of the data on each drive, even if the drives have changed their
target ID.