From: Justin Maggard Subject: Re: large file system & high object count testing Date: Mon, 31 Aug 2009 16:37:16 -0700 Message-ID: <150c16850908311637t18683386j66bcebd06fe05e9b@mail.gmail.com> References: <4A9BFB88.5030409@redhat.com> <4A9C0220.1040503@redhat.com> <20090831205608.GE4197@webber.adilger.int> <4A9C3A7B.3050302@redhat.com> <150c16850908311425vbc1c0a1if2a7d8ed56f650f5@mail.gmail.com> <20090831231331.GJ4197@webber.adilger.int> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Ric Wheeler , linux-ext4@vger.kernel.org, "Ted Ts'o" To: Andreas Dilger Return-path: Received: from mail-pz0-f175.google.com ([209.85.222.175]:58479 "EHLO mail-pz0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751014AbZHaXnk convert rfc822-to-8bit (ORCPT ); Mon, 31 Aug 2009 19:43:40 -0400 Received: by pzk5 with SMTP id 5so3187388pzk.21 for ; Mon, 31 Aug 2009 16:43:42 -0700 (PDT) In-Reply-To: <20090831231331.GJ4197@webber.adilger.int> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Mon, Aug 31, 2009 at 4:13 PM, Andreas Dilger wrote: > Justin, could you please replicate this corruption, collecting some > additional information before & after. =A0My recollection is that the > corruption appears in the first few groups, so 64kB should be plenty > to capture the group descriptor tables (where the checksum is kept). > > - mke2fs > - dd if=3D/dev/XXX bs=3D4k count=3D16 | gzip -9 > /tmp/gdt-new.gz > - mkdir ... > - sync > - dd if=3D/dev/XXX bs=3D4k count=3D16 | gzip -9 > /tmp/gdt-mkdir.gz > - umount > - dd if=3D/dev/XXX bs=3D4k count=3D16 | gzip -9 > /tmp/gdt-umount.gz > - e2fsck > - dd if=3D/dev/XXX bs=3D4k count=3D16 | gzip -9 > /tmp/gdt-e2fsck.gz > No problem. I just sent you an email with those four attached. If anyone would like me to upload them somewhere else, just let me know. -Justin -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html