IBM Storwize V7000, Troubleshooting And Maintenance Manual

Page: 89 / 188

Chapter 7. Recovery procedures
This topic describes these recovery procedures: recover a system and back up and
restore a system configuration.
Recover system procedure
The recover system procedure recovers the entire system if the block cluster state
has been lost from all nodes.The recover system procedure recovers the entire
storage system if the data has been lost from all control enclosure node canisters.
The procedure re-creates the storage system by using saved configuration data. The
recovery might not be able to restore all volume data. This procedure is also
known as Tier 3 (T3) recovery.
Attention: Perform service actions only when directed by the fix procedures. If
used inappropriately, service actions can cause loss of access to data or even data
loss. Before attempting to recover a storage system, investigate the cause of the
failure and attempt to resolve those issues by using other fix procedures. Read and
understand all of the instructions before performing any action.
Attention:
Do not attempt the recovery procedure unless the following conditions
are met:
v
All hardware errors are fixed.
v
All node canisters have candidate status.
v
All node canisters must be at the same level of code 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 code, and where necessary, to upgrade
or downgrade the level of code.
The system recovery procedure is one of several tasks that must be performed. The
following list is an overview of the tasks and the order in which they must be
performed:
1. Preparing for system recovery
a.
Review the information regarding when to run the recover system
procedure
b. Fix your hardware errors
c.
Remove the system information for node canisters with error code 550 or
error code 578 by using the service assistant.
2. Performing the system recovery. After you prepared the system for recovery
and met all the pre-conditions, run the system recovery.
Note: Run the procedure on one system in a fabric at a time. Do not perform
the procedure on different node canisters in the same system. This restriction
also applies to remote systems.
3. Performing actions to get your environment operational
v
Recovering from offline VDisks (volumes) by using the CLI
v
Checking your system, for example, to ensure that all mapped volumes can
access the host.
© Copyright IBM Corp. 2010, 2013
71