F-34 Sun Fire X4100/X4100 M2 and X4200/X4200 M2 Servers Service Manual • August 2009
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 make sure 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 hotspare 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 hotspare 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 hotspare disk for the mirrored volume.
F.4.1.2 RAID Level Support
The following items describe the RAID level support for these servers:
■ RAID 1 (mirroring) is supported.
■ RAID 0 (striping) is supported.
■ LSI RAID 1E or IME (mirroring over more than two drives) is not supported.
■ RAID 0+1 and 1+0 are not supported by the SAS1064 controller.
F.4.1.3 RAID Volume Support
The following items describe the RAID volumes supported for these servers:
■ Up to two active RAID volumes are supported per system (RAID 0, RAID 1 or
both).
■ A striped volume (RAID 0) can contain up to four disk drives.
■ A mirrored volume (RAID 1) can contain up to two disk drives.
■ One disk drive can be set up as hotspare for a RAID 1 array (one hotspare disk per
controller maximum).
■ Volumes are transparent to the OS and are seen as a single physical disk drive no
matter how many drives they contain.
F.4.1.4 RAID Combination Support
Possible RAID Combinations in a four-drives server are listed below:
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