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Date:      Fri, 2 Aug 2002 09:04:49 +0930
From:      Greg Lehey <grog@FreeBSD.org>
To:        Drew Raines <drew-dated-1028646153.33b208@rain3s.net>
Cc:        freebsd-questions@FreeBSD.org
Subject:   Re: Striped Vinum on two drives
Message-ID:  <20020801233449.GB466@sydney.worldwide.lemis.com>
In-Reply-To: <20020801150427.GJ26818@mail.rain3s.net>
References:  <20020731211840.GN19920@mail.rain3s.net> <20020801010118.GM17787@wantadilla.lemis.com> <20020801150427.GJ26818@mail.rain3s.net>

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On Thursday,  1 August 2002 at 10:04:27 -0500, Drew Raines wrote:
> Greg 'groggy' Lehey wrote:
>>
>> On Wednesday, 31 July 2002 at 16:18:40 -0500, Drew Raines wrote:
>>> I have a machine with two hard drives:
>>>
>>>    ad0  Maxtor     13 GB
>>>    da0  Fujitsu    36 GB
>>>
>>> I'd like to create root, swap, and usr partitions on the
>>> beginning of ad0, and have the rest of the drive, as well as
>>> all of da0 be one giant 45 GB filesystem.  Something like:
>>>
>>>    ad0  /
>>>         swap
>>>         /usr
>>>         /bigfs
>>>    da0  /bigfs (cont.)
>
> [...]
>
>> No, I'd consider this a fairly typical application.
>
> [...]
>
>>> Also, *can* I do it?  I just want the two spindles to look
>>> like one disk, striping the data accordingly.
>>
>> Yes, you can do that.  But given the discrepancy in size
>> between your disks, you might find it more useful to
>> concatenate them.
>
> OK.  I've done that, but I have a few questions.
>
> (1)  Where did my space on /bigfs go?
>
>          Filesystem   1K-blocks  Used    Avail Capacity  Mounted on
>          /dev/da0s1a      99742 33574    58190    37%    /
>          /dev/da0s1e    3096462 81006  2767740     3%    /usr
>          procfs               4     4        0   100%    /proc
>          /dev/vinum/1  43187825     1 39732798     0%    /bigfs
>
>      Does it really take 3.5 GB for Vinum to store information?

No.

> I thought it was 265 blocks.

Correct, but this is on the drive, not in the volume.  The size of the
volume is what you get.

The file system size looks right to me.  Don't forget that UFS
reserves approximately 10% of the total space for root, and the value
you see looks right to me.

Greg
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