Method of assuring data integrity on storage volumes
First Claim
Patent Images
1. A storage system comprising:
- a storage volume for storing data; and
a storage controller coupled to the storage volume, the controller controlling access to the storage volume, and being receptive to a command for preventing write operations to the data which has previously been stored in at least one selected portion of the storage volume prior to receiving the command;
whereinat a first time when the storage controller receives the command, a first hash value for the data is calculated, in response to receipt of the command; and
wherein at a second time later than the first time a second hash value for the data stored in at least the one selected portion of the storage volume is calculated and the second hash value is compared to the first hash value to determine if data stored in at least the selected portion of the storage volume has been changed between the first time and the second time.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for assuring the integrity of stored data in a storage system is provided. At a specified time at which further writes to a desired portion of the stored data are to be precluded, a hash value is calculated for the desired portion of stored data. At a later time, retrieval of the stored data is performed and the hash value recalculated. A comparison of the former and present hash values reveals whether the data has remained unchanged.
27 Citations
10 Claims
-
1. A storage system comprising:
-
a storage volume for storing data; and a storage controller coupled to the storage volume, the controller controlling access to the storage volume, and being receptive to a command for preventing write operations to the data which has previously been stored in at least one selected portion of the storage volume prior to receiving the command;
whereinat a first time when the storage controller receives the command, a first hash value for the data is calculated, in response to receipt of the command; and wherein at a second time later than the first time a second hash value for the data stored in at least the one selected portion of the storage volume is calculated and the second hash value is compared to the first hash value to determine if data stored in at least the selected portion of the storage volume has been changed between the first time and the second time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification