Sun Microsystems Netra X4200 M2, Руководство по обслуживанию

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Appendix E Serial Attached SCSI BIOS Configuration Utility 193
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.
Automatic Data Resynchronization and Hot Spares
Caution –
Possible data loss: If you insert a hard disk drive (HDD) that has been
configured with a RAID volume into a server that did not previously have its HDDs
configured with RAID volumes, the existing HDD(s) in the server will be converted
to RAID volumes during automatic synchronization and any existing data on the
existing HDD(s) in the server will be erased. Before permanently removing a HDD
that is part of an active RAID volume, use the LSI Configuration Utility to delete the
RAID volume from the HDD to avoid causing this problem.
The SCSI parameters, including RAID volumes configuration, are set up using the
LSI BIOS Configuration Utility that is 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 Mbytes of unused disk space at the end of each drive to store the
metadata.
The metadata stored on the disk drives contains sufficient information to restore and
reactivate the RAID volumes in case the NVRAM is lost (for example, when the
motherboard is replaced). However, if removed, the disk drives must first be
labelled to ensure that they are placed back in the same disk bays from which they
were removed when reinstalled. When the system is powered on, the RAID volumes
are automatically activated and resynchronization is automatically performed.
One of the disk drives can be set up as a hot-spare disk if a RAID 1 (mirroring)
volume is already set up. If one of the two disk drives used in the RAID 1 volume
fails, the hot-spare drive automatically replaces it in the volume and resync is
immediately performed.
It must be noted that, until the resync is completed, the system is vulnerable to a
failure of the now “primary” disk (the disk left from the original mirrored volume)
since full data redundancy is not yet achieved. When the bad disk is replaced, the
new disk automatically becomes the new hot-spare disk for the mirrored volume.