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Improving ext4: bigalloc, inline data, and metadata checksums

Improving ext4: bigalloc, inline data, and metadata checksums

Posted Dec 21, 2011 23:09 UTC (Wed) by GalacticDomin8r (guest, #81935)
In reply to: Improving ext4: bigalloc, inline data, and metadata checksums by tytso
Parent article: Improving ext4: bigalloc, inline data, and metadata checksums

> Also, note that because of how Soft Update works, it requires forcing metadata blocks out to disk more frequently than without Soft Updates

Duh. Can you name a file system with integrity features that doesn't introduce a performance penalty? I thought not. The point is that the Soft Updates method is (far) less overhead than most.

> What's worse, it depends on the disk not reordering write requests

Bald faced lie. The only requirement of SU's is that writes reported as done by disk driver are indeed safely landed in the nonvolatile storage.


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Improving ext4: bigalloc, inline data, and metadata checksums

Posted Dec 22, 2011 11:32 UTC (Thu) by nix (subscriber, #2304) [Link]

A little civility would be appreciated. Unless you're a minor filesystem deity in pseudonymous disguise, it is reasonable to assume that Ted knows a hell of a lot more about filesystems than you (because he knows a hell of a lot more about filesystems than almost anyone). It's also extremely impolite to accuse someone of lying unless you have proof that what they are saying is not only wrong but maliciously meant. That is very unlikely here.


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