NEC IS016-5E User Manual

Chapter 3    Notes 

 

As basic operations, first temporarily halt the operations on the MV and flush the MV cache data 

using the command provided by replication operation.    Then, unmount the MV to release 

association between the file system and disks.    At this time, when the MV is used from another 

operation or service, an unmounting error occurs.     

If unmounting error occurred due to referencing or access from unexpected product, writing 

process is completed after waiting for completion of delayed updating process, in several tens of 

seconds.    If Separate is executed without writing cache data completely, files on the RV may 

lack file consistency.    In such a case, executing CHKDSK command upon mounting RV on 

backup server restores inconsistent files. 

For planning backup operations, extract processes and services to be halted.    Against 

unmounting errors, processes to wait for delayed updating must be considered. 

 

Combination of the Oracle standard on-line backup function and the data replication function 

allows producing backup data even under business operation.    The on-line backup reserves a 

logical static point in combination with log.    The log is used upon recovery. 

For executing cold backup or using data replication for files other than database requires 

considerations similar to those for usual files. 

 

Use of the ReplicationControl SQL Option allows producing backup data even under business 

operation.    Refer to the “ReplicationControl SQL Option User’s Manual” for details.    In the 

cases above also, backup of transaction logs is made via network.    Using data replication for 

transaction log requires considerations similar to those for usual files. 

Halting database and making backup physically requires considerations similar to those for usual 

files.    The backup data made in such process cannot be used for transaction log. 

 

When using RV file on backup server and replicating data again, cache data on backup server 

must be discarded. 

To discard cache data, flush the cache data and unmount the RV using the commands provided by 

replication operation.    You can use the -force option to forcibly unmount the RV even when the 

file system is being used. 

If the process above is omitted, inconsistency may occur between cache and volume upon 

separating again, which may result in destruction of file system.