v Any data that was in the cache at the point of failure is lost. The loss of data can
result in data corruption on the affected volumes. If the volumes are corrupted,
call the IBM Support Center.
Fix hardware errors
Before you can run a system recovery procedure, it is important that the root cause
of the hardware issues be identified and fixed.
Obtain a basic understanding about the hardware failure. In most situations when
there is no clustered system, a power issue is the cause. For example, both power
supplies might have been removed.
Removing system information for node canisters with error
code 550 or error code 578 using the service assistant
The system recovery procedure works only when all node canisters are in
candidate status. If there are any node canisters that display error code 550 or error
code 578, you must remove their data.
Before performing this task, ensure that you have read the introductory
information in the overall recover system procedure.
To remove system information from a node canister with an error 550 or 578,
follow this procedure using the service assistant:
1. Point your browser to the service IP address of one of the nodes, for example,
https://node_service_ip_address/service/.
If you do not know the IP address or if it has not been configured, you must
assign an IP address using the initialization tool.
2. Log on to the service assistant.
3. Select Manage System.
4. Click Remove System Data.
5. Confirm that you want to remove the system data when prompted.
6. Remove the system data for the other nodes that display a 550 or a 578 error.
All nodes previously in this system must have a node status of Candidate and
have no errors listed against them.
7. Resolve any hardware errors until the error condition for all nodes in the
system is None.
8. Ensure that all nodes in the system display a status of candidate.
When all nodes display a status of candidate and all error conditions are None,
you can run the recovery procedure.
Performing system recovery using the service assistant
Start recovery when all node canisters that were members of the system are online
and have candidate status. If there are any nodes that display error code 550 or
error code 578, you must remove their system data to get them into candidate
status. Do not run the recovery procedure on different node canisters in the same
system. This restriction includes remote systems also.
All node canisters must be at the same level of software that the storage system
had before the system failure. If any node canisters were modified or replaced, use
the service assistant to verify the levels of software, and where necessary, to
upgrade or downgrade the level of software.
68 Storwize V7000: Troubleshooting, Recovery, and Maintenance Guide
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