Lenovo System x3850 X6 Installation And Service Manual page 95

• For additional information about the supported adapters, see "Installing an adapter in the standard or half-
length I/O book" on page 90, "Supported ML2 (Ethernet) adapters" on page 88, "Supported RAID
adapters" on page 86, and "Supported RAID cache cards" on page 87.
• The ability to hot-add the full-length I/O book is dependent on the operating system. If the operating
system does not support hot-plug, the addition or removal of a full-length I/O book might cause an
unrecoverable system error.
Attention:
– If the I/O bay is not populated with a full-length I/O book when the operating system boots or the
operating system is still running, a full-length I/O book cannot be hot-added to the I/O bay (due to
insufficient resources).
– If the I/O bay has a full-length I/O book installed when the operating system boots, you can hot-swap
the full-length I/O book.
• If adapters are installed in the I/O book, you must first press the Power button on the full-length I/O book
and power-off all three PCIe slots before you remove the I/O book from the server. The slots LED lights
will be off when the slots are off-line.
• You can remove and install PCIe adapters in this I/O book without powering off the server.
• This I/O book has two PCIe auxiliary power connectors (one 6-pin for 75W extra power and one 8-pin for
150W extra power.
• When you install a double-wide adapter in one of the x16 slots on this I/O book, the x8 slot is no longer
usable and the other x16 slot might not be usable due to limited power available for the I/O book.
• This I/O book supports both half-length, full-height and full-length, full-height and low-profile PCIe Gen3
and Gen2 adapters.
• When this I/O book is installed in the server, it is connected to compute book 3 or compute book 4. See
Table 20 "PCIe slot number and the associated compute books" on page 81.
• You can install up to two full-length I/O books in the server.
• You can also install one full-length I/O book and one half-length I/O book in the server.
• PCIe slots 2 and 5 (when two full-length I/O books are installed) are connected to compute books 3 and 4
DMI buses that have been reconfigured as x4 PCIe Gen 2 buses.
• PCIe slots 2 and 5 (when two full-length I/O books are installed) are x8 slots that are wired for x4. If you
install a x8 adapter in slots 2 and 5 that can down train to x4 bandwidth, it will run at the x4 bandwidth.
The x8 connector can be used for x4 or x8 adapters. Check the information that comes with your adapter
for compatibility information.
• PCIe slots 1, 3, 4, and 6 (when two full-length I/O books are installed) are x16 Gen 3 adapter slots.
• Double-wide adapters can only be installed in PCIe slots 1 or 4. When you install double-wide adapters in
slots 1 or 4, you cannot install an adapter in slots 2 and 5.
• This I/O book also provides two auxiliary power connectors to support adapters that need up to 300 watts
of power.
• For additional information about this I/O book, see full-length I/O book.
The following table lists the I/O book PCIe slot numbering and the slots associated with each compute book
(when two I/O books are installed):
Table 20. PCIe slot number and the associated compute books
Two-column tables that shows the association between the PCIe slots and the compute books
.
Chapter 2 Installing optional devices
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