IBM X3850 X6, Installation And Service Manual, Page: 100 / 1730

Installing the full-length I/O book
This information provides notes and other information that you need to consider
when you install the full-length I/O book and the instructions for installing the
I/O book in the server.
About this task
The following notes provide information that you must consider when you install
the full-length I/O book.
Note:
The full-length I/O book adds a 3-inch mechanical extension to the base
length dimension of the server chassis to support full-length adapters.
v
For additional information about the supported adapters, see “Adapter
installation instructions” on page 92, “Supported ML2 (Ethernet) adapters” on
page 89, “Supported RAID adapters” on page 87, and “Supported RAID cache
cards” on page 88.
v
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.
v
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.
v
You can remove and install PCIe adapters in this I/O book without powering off
the server.
v 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.
v
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.
v
This I/O book supports both half-length, full-height and full-length, full-height
and low-profile PCIe Gen3 and Gen2 adapters.
v
When this I/O book is installed in the server, it is connected to compute book 3
or compute book 4. See Table 23 on page 83
v
You can install up to two full-length I/O books in the server.
v You can also install one full-length I/O book and one half-length I/O book in
the server.
v
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.
v
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.
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System x3850 X6 and x3950 X6 Types 3837 and 3839: Installation and Service Guide