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CHAPTER 4 PCI Card Hot Maintenance in Red Hat Enterprise Linux 6
4.2 Hot add of SB
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C122-E175-01EN
a. Check if the size of the dump disk save area is sufficient for the memory capacity to be added. For
details on how to estimate the size required, contact the distributor where you purchased your product,
or your sales representative.
b. Check if the points/restrictions are clear. For detail, see ‘3.2.1 Dynamic Reconfiguration (DR)’
5. Switch to the maintenance mode.
Insert the SB to be added into a free SB slot.
6. Check for any errors in the SB to be added.
Example：How to check from the MMB Web-UI
a. Open System >SB >SB #n window.
b. Check if the status of the [Board Information] is ‘OK’.
c. Check if the other statuses displayed in SB #n window are ‘OK’.
d. Open Partition >Partition Configuration window.
e. Check if the status of the SB for addition is a Free SB or Reserved SB. The number of the SB for
adding is noted down.
Update the firmware of the SB for addition.
4.2.2 Confirming the status of SB before SB hot add
1. Estimating how long times OS will take to process SB hot add.
Estimate how long times OS will take to process SB hot add and confirm that the estimated time does not
exceed one hundred minutes.
If the estimated time exceeds one hundred minutes, reduce the load of the system.
If SB hot add is performed in the system with high load, timeout may occur while OS processes SB hot
add because big performance of CPU is needed to initialize added memories.
For how to deal with when timeout occurs, see ‘4.2.3 DR operation in SB hot add’.
The time t when OS will take to process SB hot add can be estimated by below equation, where the unit
is second:
t =
+
+
+
where,
:
the time when OS will take to recognize added resources
: the time when the pre-process of collaboration program is working
: the time when OS will take to activate added resources
: the time when the post-process of collaboration program is working
The time
when OS will take to recognize added resources can be estimated by below equation:
= 0.8 ×
where,
The time
when OS will take to activate added resources can be estimated by below equation.
= 0.002 ×
×
×
+ 1
where,
: size of added memories (GB unit)
: total size of memory after SB hot add (GB unit)
: the number of running process
: the number of CPU before SB hot add
: size of added memories (GB unit)