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Re: Problem with XFS on USB 2TB HD

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: Problem with XFS on USB 2TB HD
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Mon, 20 Dec 2010 10:55:47 +0100
Cc: Kevin Richter <xfs@xxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20101220045126.GK5193@dastard>
Organization: Intellique
References: <4D0C9A4F.4040108@xxxxxxxxxxx> <20101220001024.GH5193@dastard> <4D0EC5C5.2070407@xxxxxxxxxxx> <20101220045126.GK5193@dastard>
Le Mon, 20 Dec 2010 15:51:26 +1100 vous écriviez:
> <shrug>
> 
> Who knows how the encryption algorithm (sha256) is encrypting
> blocks.

According to Wikipedia, the block size is 512.

> FWIW, encryption makes any sort of corruption below the encrypted
> layer much, much worse as it turns things like single bit media
> errors into undecipherable, unrecoverable blocks of noise. No
> filesystem can recover from such corruption of an encrypted device.
> Hence if you had the same problem on ex3, ext4, JFS, etc you will
> end up with the same mess (or worse).

That's why I have an unencrypted local backup and an encrypted remote
one :)

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