Huawei OceanStor Dorado V3 Series Parts Replacement page 135

OceanStor Dorado V3 Series
Parts Replacement
Impact on the System
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Prerequisites
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Precautions
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Issue 05 (2019-01-30)
During the replacement of a front-end interface module, the system switches services
from ports on this module to ports on another module of the peer-end controller. If
available links are unable to bear the current service load, host latency increases and the
system performance degrades. If there are no other redundant links, services run on a
single link and the system reliability degrades.
During the replacement of a back-end interface module, the system switches services
from ports on this module to ports on another module of the local controller or the peer-
end controller. A back-end port has no other redundant links, and disks in the loop all run
with a single path, causing the system reliability to degrade.
During the replacement of a PCIe interface module, the controller on which the interface
module resides becomes offline and all services on the controller are automatically
switched to the peer controller. Storage I/Os are suspended for 5 to 10 seconds during the
service switchover. The service switch over duration increases if the service load is out
of the load bearing limit of a single controller. The replacement may fail due to a heavy
service load. In addition, the replacement degrades system performance and reliability.
You are advised to perform interface module replacement during off-peak hours. After
the replacement is complete, the controller on which the interface module resides will
restart and services will be automatically switched back to the controller.
NOTE
Use SmartKit to replace a PCIe interface module.
The spare part is ready based on the BOM code of the interface module you want to
replace and the type of the spare part is the same as that of the interface module you want
to replace.
A label has been attached to the handle of the spare part.
The interface module that you want to replace has been located.
NOTE
You can locate a component in either of the following ways:
l Locating a component based on alarms in DeviceManager: On the Alarms and Events page of
DeviceManager, view the help information and locate the component to be replaced.
l Locating a component based on the status of its alarm indicator: For details about the indicators on
different components, see indicator introduction in the Product Description specific to your product.
Services running on the interface module that you want to replace have been stopped.
The cable connection positions of the interface module that you want to replace are
labeled on the cables.
The type of the new interface module must be same as that of the one you want to
replace. Otherwise, parts replacement will fail and the configuration of the interface
module will be lost. If the configuration of the interface module is lost, collect logs and
contact Huawei technical support.
Note the following if you want to replace a SmartIO interface module:
– For the new SmartIO interface module without an optical module
Remove the optical module from the SmartIO interface module you want to replace
and insert the new SmartIO interface module into the controller enclosure. After the
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5 Replacing FRUs
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