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From: Robert Watson <rwatson@FreeBSD.org>
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Cc: cvs-src@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org,
	Nick Hibma <n_hibma@freebsd.org>
Subject: Re: cvs commit: src/sbin/mdconfig mdconfig.8 mdconfig.c
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On Wed, 21 Feb 2007, John Baldwin wrote:

> On Wednesday 21 February 2007 05:36, Robert Watson wrote:
>>
>> On Tue, 20 Feb 2007, Nick Hibma wrote:
>>
>>> n_hibma     2007-02-20 22:04:23 UTC
>>>
>>>  FreeBSD src repository
>>>
>>>  Modified files:
>>>    sbin/mdconfig        mdconfig.8 mdconfig.c
>>>  Log:
>>>  Kris suggested that swap is a better choice as a default than malloc.
>>>
>>>  MFC:    1 week
>>
>> Are you sure this should be MFC'd?  While I agree with the change in 
>> principle, it will cause systems currently using malloc-backed md devices 
>> to mysteriously switch to swap-backed.  How will this behave on systems 
>> that don't have swap, such as pure diskless systems not using NFS-backed 
>> swap? This isn't a strong objection per se, but it could be that rc.d 
>> scripts need tweaking for diskless environments if they currently do use 
>> malloc-back md devices based on that being the default.
>
> I don't think this changes the default for anything in 6.x.  He changed the 
> default for his patch from yesterday that made it assume a type if you do 
> 'mdconfig -s <size>'.  Currently you have to do:
>
> 'mdconfig -a -t malloc -s <size>' or 'mdconfig -a -t swap -s <size>'
>
> but Nick changed it so just '-s <size>' implied '-a -t malloc', and now he's 
> changed it to imply '-a -t swap'.

Ah, OK.  This sounds reasonable.

Thanks!

Robert N M Watson
Computer Laboratory
University of Cambridge