Avoid overwriting a chunk

The chunks associated with each Informix® instance are not known to other Informix instances. It is possible to inadvertently create a chunk on a file or device that is allocated as a chunk to another Informix instance, which results in data corruption.

If you attempt to initialize an instance, where the ROOTPATH configuration parameter specifies a file or device that is the root chunk of another instance, the command fails with the following message in the online.log:
DISK INITIALIZATION ABORTED: potential instance overwrite detected.   

To disable this initialization check, set the FULL_DISK_INIT configuration parameter to 1 in your configuration file and try to initialize the instance again. However, this initialization check is restricted to the root chunk. Adding dbspaces or chunks succeeds even when the file or device is allocated to another instance.

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