From mboxrd@z Thu Jan 1 00:00:00 1970 From: Phillip Susi Subject: Re: e2image doesn't get backup superblocks? Date: Mon, 20 Feb 2012 14:22:34 -0500 Message-ID: <4F429D7A.7080202@ubuntu.com> References: <4F42683F.3070409@ubuntu.com> <20120220190535.GA6541@thunk.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: linux-ext4@vger.kernel.org To: Ted Ts'o Return-path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120]:23047 "EHLO cdptpa-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751736Ab2BTTWg (ORCPT ); Mon, 20 Feb 2012 14:22:36 -0500 In-Reply-To: <20120220190535.GA6541@thunk.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJPQp16AAoJEJrBOlT6nu75YsYH/RfMeeqyq1YzolyRJzeQuQVB vi1sKkW8LlYutAU3bgJPPxNa3VEUlz5BDqOLzL2DZcsUWUU0t/XkwWGBW8M5UPuy LQyc/DO2Uz+ho8Jh+WSaOT0FByE5Gp4o5Xu5nhdO27MuTa1q0WiAxGneTnoN+ZNW G2FkaTAWEGTPhUzV8F32ZnfKNzGJExl5BhiBEm5p5d2jqdzrQS4Uz15ZDbIqSmnL uJNmtdcBjvq721Rcrf9U15TzZgumxy4VVaNNqR1ZhFG+HnGUVmsqC6HQ1/WaQHWh WqyXdgX1SlCPP2oAYE8pRvhLQkujg553QBYKkuckQfXD8YnpFWWFQ3fsGLWG5+c= =cqFo -----END PGP SIGNATURE-----