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CHAPTER 4 PCI Card Hot Maintenance in Red Hat Enterprise Linux 6
4.4 Hot add of IOU
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C122-E175-01EN
mpath1 (36000b5d0006a0000006a104900000000) dm-0
FUJITSU,ETERNUS_DX400
[size=50G][features=0][hwhandler=0][rw]
¥_ round-robin 0 [prio=1][active]
¥_ 3:0:0:0 sdb 8:16 [active][ready]
Example of DM-MP display after connecting path
# /sbin/multipath -ll
mpath1 (36000b5d0006a0000006a104900000000) dm-0
FUJITSU,ETERNUS_DX400
[size=50G][features=0][hwhandler=0][rw]
¥_ round-robin 0 [prio=2][enabled]
¥_ 3:0:0:0 sdb 8:16 [active][ready]
¥_ 5:0:0:0 sdc 8:32 [active][ready]
*2: See the ETERNUS Multipath Driver User's Guide (For Linux).
FC Card
Restart the application which is stop at preparing for IOU hot replacement
4.4 Hot add of IOU
This section describes the hot add of the IOU.
4.4.1 Preparation for IOU hot add
The description of the flow of preparations is given below.
1. Arrange for the IOU for addition.
2. Check if number of IOU required for addition is available.
3. Insert the IOU to be added into a free IOU slot.
Note
Check if the I/O device is normally operating in the free partition. During addition, I/O pre-diagnostic process
is not executed.
4.4.2 DR operation of IOU hot add
This section describes the DR operation for IOU hot add.
1. Log into the MMB Web-UI using Administrator privileges.
2. Execute the hotadd command.
Example：When adding IOU1 in partition1.
# hotadd partition 1 IOU 1 quiet
#
3. Execute /opt/FJSVdp-util/sbin/dp stat IOU command in the operating system shell.
The list of IOUs connected to the system is displayed. Check if the IOU that was added is displayed.
Example： When IOU1 is added.
# /opt/FJSVdp-util/sbin/dp stat IOU
IOU0: online
IOU1: offline
IOU2: empty
IOU3: empty
When newly adding an IOU to a partition, it will be displayed as offline since the IOU is not recognized by
the operating system.
4. Execute /opt/FJSVdp-util/sbin/dp add IOU1 command in the operating system shell.
The IOU that was newly added to the partition will be powered on.
Example：When IOU1 is powered on