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CHAPTER 4 PCI Card Hot Maintenance in Red Hat Enterprise Linux 6
4.3 Hot replacement of IOU
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C122-E175-01EN
4.3 Hot replacement of IOU
This section describes the hot replacement of the IOU. There are two cases in hot replacement of the IOU:
- Replacing IOU itself due to trouble of IOU itself or trouble of onboard NIC
- Replacing, expanding or removing PCI Express card installed in IOU
For replacing, expanding or removing PCI Express card, IOU itself does not need to be replaced. However, it
is needed that the IOU has to be removed from the cabinet for a moment. Then there is the same impact as
that of replacing IOU. It is needed to take the same steps as those of replacing IOU.
Note
- If IOU itself is hot replaced, onboard NIC of the IOU is replaced.
Note that MAC address of onboard NIC is changed after replacing IOU.
- PCI address (bus address) of PCI Express card on IOU may change after hot replacement of IOU. This
change may be occurred for replacing, expanding or removing PCI Express card.
- If iSCSI (NIC) is mounted on an IOU, hot replacement of the IOU can be performed only if all of below
conditions are satisfied.
- DM-MP (Device-Mapper Multipath) or ETERNUS multi driver (EMPD) is used for storage connection.
- Multiple path is made with a NIC on the IOU to be replaced and a NIC on an IOU other than the IOU to
be replaced.
- A NIC on the IOU to be replaced makes an interface independently.
Example of single interface:
- If FC card used for SAN boot is mounted on an IOU to be replaced, hot replacement of the IOU
cannot be performed.
The step of hot replacement of IOU is described below in order.
4.3.1 Preparation for IOU hot replacement
The description of the flow of preparations is given below.
1. Arrange for the IOU for replacement.
Note
This step is not needed if the IOU is reused when expanding, replacing or removing PCI Express card.
After arranging for the IOU, check whether I/O device of the IOU normally works at free partition. Pre-
diagnosis does not performed when IOU is added.
2. For replacing IOU or expanding, replacing or removing PCI Express card in the IOU, it is needed to
remove IOU. If IOU is removed, PCI Express card and onboard NIC installed in the IOU are also removed.
Check that no software use the PCI Express card to be removed, performing either of below measure.
a Stopping the software which uses PCI Express card or onboard NIC in the IOU to be removed before
removing.
b Preventing the software from operating PCI Express card and onboard NIC.
Execute the command /opt/FJSVdp-util/sbin/dp show IOU from shell on OS to check resources installed
in the IOU.
Example: checking IOU3
# /opt/FJSVdp-util/sbin/dp show IOU3