linux-ext4 - Re: e2image doesn't get backup superblocks?

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Message-ID: <4F429D7A.7080202@ubuntu.com>
Date:	Mon, 20 Feb 2012 14:22:34 -0500
From:	Phillip Susi <psusi@...ntu.com>
To:	Ted Ts'o <tytso@....edu>
CC:	linux-ext4@...r.kernel.org
Subject: Re: e2image doesn't get backup superblocks?

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On 2/20/2012 2:05 PM, Ted Ts'o wrote:
> Why do you want to do this?  In general the tools will 
> automatically sync the backups from the master if it is necessary 
> (i.e., in the case of a file system resize, or if there is a
> change in the file system features).  Otherwise, we deliberately
> try to avoid modifying the backups, since any updates to the
> backups is an opportunity to copy corrupted values to the backups,
> or otherwise risk write failures that could smash the backups.

Because I was experimenting with e2fsck -E discard on a raw image and
it was clobbering the superblock, and the backups weren't in the
image.

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