Appendix F Serial Attached SCSI BIOS Configuration Utility F-33
Note – The RAID firmware needs at least 64 MB of unused disk space at the end of
each drive to store metadata.
F.4.1 RAID Implementation and Support
The LSISAS1064 controller supports the Integrated RAID hardware solution, which is
a highly integrated, low-cost RAID solution. It is designed for systems requiring
redundancy and high availability, but not requiring a full-featured RAID
implementation.
Integrated RAID includes Integrated Mirroring (IM or RAID 1) and Integrated
Striping (IS or RAID 0) technology. Integrated RAID is OS independent, easy to
install and configure, and does not require a special driver. A RAID Volume is seen as
a single drive by the host BIOS and OS.
The LSISAS1064 controller is based on the Fusion-MPT (Message Passing
Technology) architecture. The Fusion-MPT architecture requires only a thin device
driver that is independent of the I/O bus. LSI Logic provides the device drivers for
various operating environments.
The ILOM Service Processor monitors the GPIOs from the SAS1064 controller. If the
controller indicates a failure, the service processor lights the fault LED on the
corresponding disk drive and logs the error in the SP event log.
F.4.1.1 Automatic Data Resynchronization and Hotspares
Caution – Possible data loss: If you insert an drive that has been configured with a
RAID volume into a server that did not previously have its drives configured with
RAID volumes, the existing drive(s) in the server will be converted to RAID volumes
during automatic synchronization and any existing data on the existing drive(s) in
the server will be erased. Before permanently removing an drive that is part of an
active RAID volume, use the LSI Configuration Utility to delete the RAID volume
from the drive to avoid causing this problem.
The SCSI parameters, including RAID volumes configuration, are set up using the
LSI BIOS configuration utility accessible by pressing the CTRL+C keys during the
boot process. The LSI RAID firmware and BIOS is OS-independent and you set up
RAID while in MPTBIOS POST, before booting to an OS.
The parameters are saved in both the NVRAM and the disk drives. The RAID
firmware needs 64 MB of unused disk space at the end of each drive to store the
metadata.
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