linux-kernel - Re: Why minor is still 8 bit?

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Date:	Mon, 04 Jun 2012 09:11:23 -0700
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	George Shuklin <george.shuklin@...il.com>
CC:	Al Viro <viro@...IV.linux.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: Why minor is still 8 bit?

On 6/3/2012 8:53 PM, George Shuklin wrote:
>
> On 04.06.2012 05:35, Al Viro wrote:
>> On Mon, Jun 04, 2012 at 05:25:01AM +0400, George Shuklin wrote:
>>> I've understand that major and minor numbers for device is 8-bit size.
>>>
>>> I've don't understand, WHY? In 2012!
>>>
>>> (I've just have some discussion about 8-bit counter limitations in
>>> context of cloud computing. In middle of 2012!!!!)
>> Yes, shocking.  It's been several years and you are still using that
>> buzzword; I mean, it's _so_ 2010...  Should've moved on to whatever's
>> in this year...
>>
>> Incidentally, minors are 20 bit and majors are 12, but don't let that
>> stand in the way of righteous indignation - what's mere facts when
>> one is having discussions in context, presumably leveraging synergies
>> all along...
> Ok, thank you for information.
>
> But question is almost same: can I have 30k active logical volumes on
> my single server, please?

What are you trying to do, create a logical volume for every file?
There are at least three separate technologies available that will
solve whatever your problem is better than having 30,000 logical
volumes. I don't have a clue what you think you're trying to
accomplish and I am still willing to bet beers that you're bus is
parked solidly on the wrong tracks.


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