linux-kernel - Re: [PATCH v2 0/3] Persistent device name using alias name

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Date:	Fri, 22 Jul 2011 06:32:09 -0700
From:	Greg KH <greg@...ah.com>
To:	Nao Nishijima <nao.nishijima.xt@...achi.com>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	James.Bottomley@...senPartnership.com, kay.sievers@...y.org,
	jcm@...hat.com, coughlan@...hat.com, kzak@...hat.com,
	dle-develop@...ts.sourceforge.net,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	yrl.pp-manager.tt@...achi.com, dgilbert@...erlog.com,
	stefanr@...6.in-berlin.de, hare@...e.de, joe@...ches.com
Subject: Re: [PATCH v2 0/3] Persistent device name using alias name

On Fri, Jul 22, 2011 at 07:59:26PM +0900, Nao Nishijima wrote:
> Hi,
> 
> This patch series provide an "alias name" of the disk into kernel messages.
> Users can assign a preferred name to an alias name of the device.
> 
> A raw device name of a disk does not always point a same disk at each boot-up
> time. Therefore, users have to use persistent device names, which udev creates
> to always access the same disk. However, kernel messages still display the raw
> device names.
> 
> My proposal is that users can use and see persistent device names which were
> assigned by they because users expect same name to point same disk anytime.
> 
> Why need to modify kernel messages?
> - We can see mapping of device names and persistent device names in udev log.
>   If those logs output to syslog, we can search persistent device name from
>   device name, but it can cause a large amount of syslog output.
> 
> - If we can use the persistent device names and can always see the same name on
>   the kernel log, we don't need to pay additional cost for searching and picking
>   a correct pair of device name and persistent device name from udev log.
> 
> - Kernel messages are output to serial console when kenel crashes,
>   it's so hard to convert device name to alias name.
> 
> 
> Of course, I am going to modify the commands using device name so that users
> can use alias names.

Please do that first, and then you will not need any kernel changes in
the first place :)

Anyway, you all know my objections to this patch series, but again, as
I'm not the block subsystem maintainer, I really can't do anything.

greg k-h
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