On Sun, 31 Jan 2010, Tony MacDoodle wrote:
Has anyone encountered any file corruption when snapping ZFS file
systems? How does ZFS handle open files when compared to other file
system types that use similar technology ie. Veritas, etc...??
I see that Richard did not really answer your question.
Zfs snapshot captures the exact state of data which is already
committed to disk. Zfs may buffer written data up to 30 seconds
before committing it to disk. Synchronous writes go to disk
essentially immediately, and before returning control back to the
application.
Since written data may be in an inconsistent state, it is certainly
quite possible for a snapshot to contain "corrupted" data from the
perspective of the application, similar to the way that data may be
corrupted after a system panic or power failure. An application which
knows about the snapshot mechanism can synchronise its data to disk
before requesting a snapshot.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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