From: George Shuklin <george.shuklin@gmail.com>
To: Casey Schaufler <casey@schaufler-ca.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Why minor is still 8 bit?
Date: Mon, 04 Jun 2012 22:59:29 +0400 [thread overview]
Message-ID: <4FCD0591.2050504@gmail.com> (raw)
In-Reply-To: <4FCCDE2B.3020306@schaufler-ca.com>
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?
next prev parent reply other threads:[~2012-06-04 18:59 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-04 1:25 Why minor is still 8 bit? George Shuklin
2012-06-04 1:35 ` Al Viro
2012-06-04 3:53 ` George Shuklin
2012-06-04 16:11 ` Casey Schaufler
2012-06-04 18:59 ` George Shuklin [this message]
2012-06-05 0:52 ` H. Peter Anvin
2012-06-05 1:08 ` George Shuklin
2012-06-05 9:23 ` Paul Bolle
2012-06-05 9:36 ` George Shuklin
2012-06-05 9:49 ` Paul Bolle
2012-06-05 11:13 ` George Shuklin
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