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

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Message-ID: <4FCD0591.2050504@gmail.com>
Date:	Mon, 04 Jun 2012 22:59:29 +0400
From:	George Shuklin <george.shuklin@...il.com>
To:	Casey Schaufler <casey@...aufler-ca.com>
CC:	Al Viro <viro@...IV.linux.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Why minor is still 8 bit?

On 04.06.2012 20:11, Casey Schaufler wrote:
> 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.
>
>
Very simple sample: I'd like to create shared storage to publish volumes 
via ISCSI. ~60Tb of drives, ~2Gb average disk size = 30k disk images. 
Can I just create a bunch of LV and export them by iet or scst? Nope: 
There is a serious limit for amount of active LV per host. Yes, I can 
create filesystem, put images (as file) to that filesystem and publish 
them back, but why FS is needed to do such simple task?
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