STEM与日常科技·英语30篇（3）

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ZFS校验和机制与静默数据损坏防护

ZFS computes a cryptographic checksum for every block of data written to disk.
When reading data back, ZFS recalculates the checksum and compares it with the stored value.
If they don’t match, ZFS knows the data has changed unexpectedly—this is silent corruption.
Unlike traditional file systems, ZFS can often repair corrupted blocks using mirrored copies or RAID-Z parity.
Silent corruption may happen due to aging hardware, cosmic rays, or firmware bugs in SSD controllers.
Because checksums are stored separately from data, even disk firmware errors rarely hide the mismatch.
ZFS verifies integrity not just on read, but also during background scrubbing operations.
This end-to-end protection ensures databases, archives, and scientific datasets remain trustworthy over years.
Without such checks, corrupted files might go unnoticed until critical analysis fails mysteriously.
ZFS treats data integrity as non-negotiable—not optional, not deferred, but enforced at every layer.