SECURE DELETION OPERATIONS IN A WIDE AREA NETWORK

摘要

Methods, systems, and computer program products are provided for performing a secure delete operation in a wide area network (WAN) including a cache site and a home site. A method includes identifying a file for deletion at the cache site, determining whether the file has a copy stored at the home site, detecting a location of the copy at the home site prior to a disconnection event of the cache site from the home site, deleting the file from the cache site during the disconnection event, and in response to the secure deletion of the file not being complete during the disconnection event, indicating on a table a remote inode number assigned to the copy associated with the file at the home site, a name under which the copy is saved, and a list of data chunk tuples specifying selected data of the copy to undergo secure deletion.

主权项

1. A method of performing a secure delete operation in a wide area network (WAN) including a cache site and a home site, the method comprising:
during a disconnection event of the cache site and the home site, identifying and receiving a request to perform a secure deletion of a file at the cache site; determining whether the file has a copy stored at the home site; detecting a location of the copy at the home site prior to a disconnection event of the cache site from the home site; in response to the secure deletion of the file not being complete during the disconnection event, indicating on a table a remote inode number assigned to the copy associated with the file at the home site, a name under which the copy is saved, and a list of data chunk tuples specifying selected data of the copy to undergo secure deletion; securely deleting the file from the cache site during the disconnection event by performing defined write patterns for each block of the file; and identifying the file for secure deletion by identifying the selected data in the file for secure deletion on the cache site; wherein:
the step of detecting the location includes detecting a location of the selected data in the file at the home site prior to the disconnection event, andthe list of data chunk tuples includes a start offset and an end offset for each data chunk tuple.