linux-ext4 - Re: [PATCH 2/3] mke2fs: print extra information about existing ext2/3/4 file systems

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Date:	Mon, 5 May 2014 10:25:55 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Lukáš Czerner <lczerner@...hat.com>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	"kzak@...hat.com" <kzak@...hat.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 2/3] mke2fs: print extra information about existing ext2/3/4 file systems

Note that the MMP block already contains the hostname for informational purposes. 

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 from foolish admins that are trying to use the same disk on multiple nodes. 

Cheers, Andreas

> On May 5, 2014, at 8:57, Theodore Ts'o <tytso@....edu> wrote:
> 
>> On Mon, May 05, 2014 at 04:51:25PM +0200, Lukáš Czerner wrote:
>> 
>> 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.
>> 
>> Karel, you had some suggestions about how to utilize that aside from
>> the mkfs...
> 
> Well, if we were going to make this be more general, one other thought
> 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 were
> 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.
> 
>                        - Ted
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