zfs discuss - Jul 2010 - zpool scrub is clean but still run in checksum errors when sending

''zpool scrub mypool'' comes out clean.
zfs send -Rv mypool at blah | ssh ...

reports IO error. And indeed, ''zpool status -v'' shows errors
in some files in an older snapshot.

Repeat scrub without errors and clear the pool. And send now fails on a
different set of files.

How can this happen?

What would be the best way to troubleshoot this kind of error?
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This is the fourth time its happened.

I had a clean scrub before starting send 15 minutes ago. And now, I see
permanent errors in one of the files of one of the snapshots. Different file
from last time.

How do I find what''s going on? ''dmesg'' in guest or
kernel does not have any relevant entries.

BTW: This is inside VirualBox but I have the host cache disabled.
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Funny thing is that if I enable the snapdir and ''cat'' the
file, it doesn''t say IO error.
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