Vinum on Root

[Greg 'groggy' Lehey]

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On Tuesday, 29 July 2003 at 18:54:53 -0700, Richard Johannesson wrote:
> On  Tuesday, July 29, 2003 6:25 PM, Greg 'groggy' Lehey wrote:
>> On Tuesday, 29 July 2003 at 18:00:25 -0700, Richard Johannesson wrote:
>>> What I trying to get to is that there seems to be two styles of getting
>>> vinum setup on a root drive:
>>> 	I. 1. setup unix partitions for swap, /, /usr, and /var
>>> 	   2. install FreeBSD5.1
>>
>> It doesn't have to be 5.1.
>
> Ok, good to know.
>
>>> 	   3. go through the bsdlabel -e
>>> 	   3.1 modify the swap with the 281 offset
>>> 	   3.2 add vinum partition h: with the same size as c:, but with a
>>> 16 offset
>>> 	   4. create a vinum config file
>>> -->	   4.1 map each sub-disk to the exact size and offset as the unix
>>> partitions
>>>
>>> 	II.1. setup unix partitions for swap and /
>>> 	   2. install FreeBSD5.1
>>> 	   3. go through the bsdlabel -e
>>> 	   3.1 modify the swap with the 281 offset
>>> 	   3.2 add vinum partition h: with the same size as c:, but with a
>>> 16 offset
>>> 	   4. create a vinum config file
>>> -->	   4.1 create sub-disks using simply the size you want with no
>>> offset
>>>
>>> Method I. comes from the Complete FreeBSD book. I actually got
>>> this to work, but was wondering about the inflexibility of not
>>> being able to change the partition sizes very easily.
>>
>> Once you have Vinum up and running, you can add and remove plexes and
>> move things around like that.
>
> So, if I use Method I, as you specified in the book, can I then move those
> particular partitions (/, /usr, /var) around without worrying about the
> original unix partition layout (offsets etc)? So, the original /, /usr, /var
> sizes and offsets won't limit the location of the /dev/vinum/root,
> /dev/vinum/usr, /dev/vinum/var?

They will for root, because you boot from the partition, not the
volume.  Also, you should understand that moving partitions means
moving data.

> For the mirroring case, should the swap partitions be mirrored too?

That depends on whether you want to still have a swap partition if a
drive fails :-)

Greg
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