Seed Pattern Buffer Corruption Detection
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Solution Overview
Problem
Current storage systems face challenges in detecting and quickly recovering from transient data corruption events, such as sector shift corruption during read operations, which can lead to incorrect data placement or short reads, often resulting in costly and unnecessary disk replacements.
Innovation Solution
A method is introduced where a seed pattern is placed at the end of the memory read buffer before initiating a read operation, allowing for the detection of data shift corruption events by checking if the seed pattern remains after the read is complete, enabling transparent retry of the failed operation without significant computational overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional read operations are performed without seed patterns, then computational overhead is minimal, but data shift corruption cannot be detected leading to unnecessary disk replacements
Solution Approach 1:
The patent applies preliminary action by placing a seed pattern at the end of the buffer before the read operation begins. This pre-positioned pattern serves as a detection mechanism that requires no additional computational resources during the actual read process, thereby improving reliability without increasing operational complexity.
Solution Approach 2:
The seed pattern is a simple, inexpensive data structure that is created temporarily for each read operation and discarded afterward. This disposable approach provides effective corruption detection while minimizing the overhead of maintaining complex persistent structures.
2Reliability
If seed pattern checking is implemented for every read operation, then data shift corruption can be detected, but processing time increases
Solution Approach 1:
The patent implements partial checking by only examining the seed pattern region of the buffer rather than validating the entire data set. This selective approach provides sufficient detection capability for sector shift corruption while minimizing the time required for verification.
3Productivity
If no corruption detection mechanism is used, then processing speed is maximized, but transient errors cause unnecessary disk replacements
Solution Approach 1:
By pre-positioning the seed pattern before the read operation, the system enables automatic detection of transient errors without adding processing steps during the critical data retrieval phase, thus maintaining high productivity while improving reliability.
Data Source
AI summary
A method and system are disclosed to quickly and inexpensively (in terms of computational overhead) detect when a data shift corruption event or a short read has occurred and to transparently retry the failed read operation. The method seeds the memory read buffer, into which read data will be written, by placing known values (a “seed pattern”) at the end of the buffer prior to initiating the read operation. If the seed pattern is still in the read buffer when the read operation completes, the read operation has encountered a data shift corruption event and should be retried. If the read operation completes correctly, the seed pattern will be overwritten by the data read from the disk. The particular seed pattern used and the size of the seed pattern are chosen to be discriminating (i.e., no false positives) and cheap to write and verify (i.e., no performance impact).