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List:       openbsd-misc
Subject:    Re: The use of DUID
From:       "Wesley M." <openbsd () e-solutions ! re>
Date:       2012-01-30 17:18:43
Message-ID: 5693525c9e6de5aaf16ae3320bdc2d34 () localhost
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Thank you for your explanation.
I understand better. 



On Mon, 30 Jan 2012 12:05:58 -0500, Nick Holland
<nick@holland-consulting.net> wrote:
> On 01/30/2012 11:10 AM, Wesley M. wrote:
>> Hi,
>>
>> I have a question, i read faq "14 - Disk Setup (DiskLabel Unique
>> Identifiers) ".
>> It is a pretty feature. We can start OpenBSD OS from the
>> disk put anywhere(order).
>>
>> But what's about after a dump/restore
>> Boot in
>> single user : backup the disk using 'dump -0af /mnt/root.dump
/dev/wd0a'
> ...
>> How to restore a disk using DUID ? keeping duid in
>> /etc/fstab ?
>> Thank you very much.
>>
>> Cheers,
>> Wesley.
> 
> So, you want to restore a disk and magically have the duid of the new 
> disk assume the old disk's value?  I think you haven't thought this 
> through.  _You_ want to replace your existing disk, fine, it might be 
> reasonable to have the same DUID magically restored to the replacement 
> disk...
> 
> But...what if that's not what you are doing?  Maybe you want to use 
> dump/restore to copy data to another part of your existing system? 
> Maybe after you upgrade to your bigger disk, you want to put the old 
> disk back on the same system...
> 
> *DUID = Disklabel Unique I Dentifier.*
> if you do something where you change the DUID of a disk to make it 
> convenient for you, it's no longer... (all together now, class)
"UNIQUE!"
> 
> If you are using DUIDs and you change your disk, you will be changing 
> the fstab.  That's how it works, that's how things stay...unique.  This 
> is not only a feature, not a bug, it is THE WHOLE IDEA.
> 
> Note: there are a lot of places where DUIDs may be LESS convenient than 
> simple device names.  Keep your brain engaged, one solution does not fit

> all.  There are also places where you may wish to mix DUIDs with 
> conventional device names (for example, the root partition of a softraid

> mirror).
> 
> Nick.

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