US2013055053A1PendingUtilityA1

End-to-end data protection supporting multiple crc algorithms

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Assignee: BUTT KEVIN DPriority: Aug 23, 2011Filed: Aug 23, 2011Published: Feb 28, 2013
Est. expiryAug 23, 2031(~5.1 yrs left)· nominal 20-yr term from priority
Inventors:Kevin D. ButtPaul J. Seger
G11B 20/1833G11B 20/1201G11B 2220/90H03M 13/6516H03M 13/3707H03M 13/2909G06F 11/1004G11B 2020/1843H03M 13/09H03M 13/6511
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Claims

Abstract

A method for providing end-to-end data protection while supporting multiple cyclic-redundancy-check (CRC) algorithms is disclosed. In one embodiment, such a method includes receiving, from a first host device, a data block protected by a first CRC. The first CRC is generated using a first CRC algorithm. The method checks the integrity of the data block using the first CRC and the first CRC algorithm. The method then computes a second CRC for the data block using a second CRC algorithm different from the first CRC algorithm. The method then stores the data block, the first CRC, and the second CRC on a storage medium, such as magnetic tape. A corresponding apparatus is also disclosed.

Claims

exact text as granted — not AI-modified
1 - 12 . (canceled) 
     
     
         13 . An apparatus for providing end-to-end data protection while supporting multiple cyclic-redundancy-check (CRC) algorithms, the apparatus comprising:
 a storage device to receive, from a first host device, a data block protected by a first CRC, the first CRC generated by a first CRC algorithm;   the storage device further configured to check the integrity of the data block using the first CRC and the first CRC algorithm;   the storage device further configured to compute a second CRC for the data block using a second CRC algorithm different from the first CRC algorithm; and   the storage device further configured to store the data block, the first CRC, and the second CRC on a storage medium.   
     
     
         14 . The apparatus of  claim 13 , wherein the storage device is further configured to receive an indication from the first host device that the first CRC was generated using the first CRC algorithm. 
     
     
         15 . The apparatus of  claim 13 , wherein the storage device is further configured to receive, from a second host device, a request for the data block on the magnetic tape medium. 
     
     
         16 . The apparatus of  claim 15 , wherein the storage device is further configured to receive, from the second host device, an indication of which of the first and second CRC algorithms the second host device is using. 
     
     
         17 . The apparatus of  claim 16 , wherein the storage device is further configured to:
 check the integrity of the data block using the first CRC if the second host device is using the first CRC algorithm; and   check the integrity of the data block using the second CRC if the second host device is using the second CRC algorithm.   
     
     
         18 . The apparatus of  claim 17 , wherein the storage device is further configured to:
 additionally check the integrity of the data block using the second CRC if the second host device is using the first CRC algorithm; and   additionally check the integrity of the data block using the first CRC if the second host device is using the second CRC algorithm.   
     
     
         19 . The apparatus of  claim 16 , wherein the storage device is further configured to:
 return, to the second host device, the first CRC with the data block if the second host device is using the first CRC algorithm; and   return, to the second host device, the second CRC with the data block if the second host device is using the second CRC algorithm.   
     
     
         20 . The apparatus of  claim 13 , wherein the storage device is further configured to store a CRC algorithm identifier with the data block identifying the CRC algorithm the first host device is using. 
     
     
         21 . The apparatus of  claim 20 , wherein the storage device is further configured to compute the second CRC to protect both the data block and the CRC algorithm identifier together. 
     
     
         22 . The apparatus of  claim 21 , wherein the storage device is further configured to, in the event a second host device requests the data block with the second CRC, recompute the second CRC to protect the data block only, and return the data block and the recomputed second CRC to the second host device. 
     
     
         23 . The apparatus of  claim 13 , wherein the first and second CRCs are stored on the storage medium in a consistent order. 
     
     
         24 . The apparatus of  claim 13 , wherein the storage device is a tape drive. 
     
     
         25 . The apparatus of  claim 13 , wherein the storage medium is magnetic tape.

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