While running a scrub, zfs status -xv reports that a large (1TB) file has checksum errors. The docs say this can be fixed by "restoring the file" from a backup. I assume this just means cp /backup/path/file /pool/path/file. However this will take awhile since the file is so large, and I was wondering if there was some way to find exactly which offsets are corrupt so that I could simply use dd or similar to fix it very quickly.
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Shelvacu
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Did you run a scrub? What happened before you asked this question? – ewwhite Sep 05 '20 at 22:58
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@ewwhite Yes, I ran a scrub which found the error; Edited the q accordingly. – Shelvacu Sep 06 '20 at 00:15
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If you have another copy of the file, just copy it over.
However, it makes sense to understand what's wrong and what occurred with your setup.
What are your zpool status -v and zfs list outputs?
Did something happen to precipitate this error? Was there a hardware related event in this environment?
ewwhite
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