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Date:      Thu, 03 Oct 2013 11:44:14 +0200
From:      "Ronald Klop" <ronald-freebsd8@klop.yi.org>
To:        "Edho Arief" <edho@myconan.net>, d@delphij.net, "Xin Li" <delphij@delphij.net>
Cc:        FreeBSD List <freebsd-fs@freebsd.org>
Subject:   Re: zfs: the exponential file system from hell
Message-ID:  <op.w4dhb0ls8527sy@212-182-167-131.ip.telfort.nl>
In-Reply-To: <524C5495.3040800@delphij.net>
References:  <52457A32.2090105@fsn.hu> <77F6465C-4E76-4EE9-88B5-238FFB4E0161@sarenet.es> <20130930234401.GA68360@neutralgood.org> <BFAE1DDE-B8F8-40E5-9D9B-CF954D5D6457@mail.turbofuzz.com> <524B1EB6.2020003@delphij.net> <CABTjkKmsYCWuqKu2WjZvD%2BVuPfrXcGj7nUVcM9dAw=EczB6Fvw@mail.gmail.com> <524C5495.3040800@delphij.net>

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On Wed, 02 Oct 2013 19:15:01 +0200, Xin Li <delphij@delphij.net> wrote:

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> On 10/02/13 09:59, Edho Arief wrote:
>> On Wed, Oct 2, 2013 at 4:12 AM, Xin Li <delphij@delphij.net>
>> wrote:
>>>
>>> I don't think 'zfs list' reports the "right" numbers either:
>>> there is no notion of "available shared space between this, this
>>> and this file systems".  The underlying problem is that it's
>>> always hard to represent mutli-dimensional value in a linear
>>> manner, to do it, we would need to create something new.
>>>
>>
>> Considering df output for UFS is never `size = used + avail`
>> anyway, is there any problem with having df output for zfs to:
>>
>> - size: total size (zpool-wide, sans redundancy) - used: specific
>> filesystem usage - avail: total available space
>>
>> ?
>
> This doesn't solve OP's problem...

The OP does not even have a real problem. It is just that the available  
diskspace is filled by more sources than expected. Which is just a  
sysadmin thing. The OP was just curious how it worked because he did not  
expect this.

You can't throw zpool+zfs at a job and expect everything to be the same as  
your previous multiple ufs partitions. Or think: "Wow, all my zfs  
filesystems are as big as the total pool. I magically gained space!" and  
than explain about df.

Ronald.




>
> Cheers,
> - --
> Xin LI <delphij@delphij.net>    https://www.delphij.net/
> FreeBSD - The Power to Serve!           Live free or die
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