Chapter 3 Maintaining the Sun Fire Servers 3-61
Installation is the reverse of this procedure. When reinstalling screws, tighten to
7 in-lbs (0.8 Nm) using an adjustable torque driver.
Note – When you return the drives to their bays, you must return each drive to the
bay from which it was removed. If the drives were previously configured as a
mirrored RAID 1 array, an automatic resynchronization is invoked with no need to
reconfigure the RAID parameters. Any hotspares are automatically reconfigured.
Note – When you reinstall an drive, open its securing latch before you push the
drive into the bay. Push the drive into the bay until it stops, then close the securing
latch to fully engage the connector on the drives backplane.
3.12.14 DIMM Population Rules
Note – Sun Fire X4100/X4200 servers use only DDR1 DIMM.
Sun Fire X4100 M2/X4200 M2 servers use only DDR2 DIMMs.
Note – Do not mix single-rank and dual-rank pairs on a CPU memory bank or there
will be a 10% loss in performance.
Note – If you are installing single-rank DIMMs, be sure to upgrade the system BIOS
to the latest version.
Note – Do not mix single-rank DIMMs and dual-rank DIMMs within a pair.
Note – For optimum performance, all DIMMs controlled by a given CPU should be
the same capacity and either single-rank or dual-rank. Mixed-rank configurations are
supported, but these configurations can result in lower memory performance. Note
that all supported 4-GB and 8-GB DIMMs are dual-rank. For 1-GB and 2-GB DIMMs,
you can identify the type by counting the DRAMs; single-rank DIMMs have 18
DRAMs, while dual-rank DIMMs have 36 DRAMs.
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