About storing MSDP catalog shadow copy duplicates on data volumes
MSDP lets you store two additional duplicates of the catalog shadow copies on separate data volumes. The storage of the duplicates allows for better metadata resiliency.
You must use the cacontrol command to add or delete a volume to store the duplicate. When you use cacontrol, any changes to the configuration take effect during the next catalog backup or recovery and the duplicates are then updated in parallel with the primary duplicate.
The following are examples of how to use the cacontrol command:
To add an additional volume, run:
cacontrol --catalog addshadowcopy <data_volume>
For example:
cacontrol --catalog addshadowcopy /msdp/data/dp1/example_volume1
To remove a volume, run:
cacontrol --catalog deleteshadowcopy <data_volume>
For example:
cacontrol --catalog deleteshadowcopy /msdp/data/dp1/example_volume1
To see the list of volumes where additional catalog shadow copy duplicates are stored, run:
cacontrol --catalog listshadowcopies
During catalog recovery, MSDP automatically uses the first non-corrupted catalog shadow duplicate it finds if the primary duplicate is corrupted.