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Churning Butter(FS): An Interview with Chris Mason

May 14, 2009, 09:03 (0 Talkback[s])
(Other stories by Jeffrey B. Layton)

[ Thanks to An Anonymous Reader for this link. ]

"It is important that we perform well, but we wanted to make sure Btrfs had features that other Linux filesystems could not easily provide.

"The biggest single feature is the copy on write snapshotting, which is actually the basis of most of the other advanced features in the FS. Btrfs snapshots are writable and can be snapshotted again.

"Data and metadata checksums are also a key part of making sure we can administer the storage over time. We need to be able to detect when the disk is giving us the wrong data, and try to correct it by grabbing data from another mirror or sending a command down to the disk array to ask for another copy. This command doesn’t exist yet, but we do plan on adding it to the Linux software raid stack at least."

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