From: Andreas Dilger Subject: Re: [PATCH 2/3] mke2fs: print extra information about existing ext2/3/4 file systems Date: Mon, 5 May 2014 10:25:55 -0600 Message-ID: References: <1399295044-24489-1-git-send-email-tytso@mit.edu> <1399295044-24489-2-git-send-email-tytso@mit.edu> <20140505140401.GD22287@thunk.org> <20140505142808.GF22287@thunk.org> <20140505144423.GG22287@thunk.org> <20140505145719.GI22287@thunk.org> Mime-Version: 1.0 (1.0) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: =?utf-8?Q?Luk=C3=A1=C5=A1_Czerner?= , Ext4 Developers List , "kzak@redhat.com" , "linux-fsdevel@vger.kernel.org" To: Theodore Ts'o Return-path: Received: from mail-ig0-f178.google.com ([209.85.213.178]:41382 "EHLO mail-ig0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751491AbaEEQZ5 convert rfc822-to-8bit (ORCPT ); Mon, 5 May 2014 12:25:57 -0400 Received: by mail-ig0-f178.google.com with SMTP id hl10so4982016igb.17 for ; Mon, 05 May 2014 09:25:57 -0700 (PDT) In-Reply-To: <20140505145719.GI22287@thunk.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: Note that the MMP block already contains the hostname for informational= purposes.=20 I'd argue that if you have several hundred SAN attached disks and they = are not zoned for specific nodes then using MMP will save your bacon fr= om foolish admins that are trying to use the same disk on multiple node= s.=20 Cheers, Andreas > On May 5, 2014, at 8:57, Theodore Ts'o wrote: >=20 >> On Mon, May 05, 2014 at 04:51:25PM +0200, Luk=C3=A1=C5=A1 Czerner wr= ote: >>=20 >> Which would be reasonable if there was a consumer of such >> information and it seemed to be useful. So I wonder what other >> people think about that. >>=20 >> Karel, you had some suggestions about how to utilize that aside from >> the mkfs... >=20 > Well, if we were going to make this be more general, one other though= t > I had was that might be useful to also stash the last hostname in the > superblock. Consider the situation where you have several hundred > fibre-channel disk volumes in your SAN, and where of course the SAN > administrator hasn't done a good job naming them, and of course the > human sysadmins hadn't bothered to use file system labels. If we wer= e > automatically stashing the hostname into the superblock at mount time= , > it might help in certain cases after the SAN directory gets smashed, > or some such. >=20 > - Ted > -- > To unsubscribe from this list: send the line "unsubscribe linux-fsdev= el" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- 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