Xen users - Apr 2005 - "disks" -- Not understanding the docs at all

> 2.  sdb = Contains a fresh install of Fedora Core 3 to
>            be used for domains, as prompted by the following:
>
>              "The first step in creating a new domain is
>              to prepare a root filesystem for it to boot off.
>              Typically, this might be stored in a normal
>              partition, an LVM or other volume manager partition,
>              a disk file or on an NFS server. A simple way to
>              do this is simply to boot from your standard OS
>              install CD and install the distribution into
>              another partition on your hard drive."
>
>            sdb1 = /
>            sdb2 = swap
>            sdb3 = /tmp
>            sdb5 = /var
>            sdb6 = /data
Try:
disks = [''phy:sdb,sdb,w'']

If that doesn''t work (I can''t remember if exporting whole
disks works) then
export the partitions individually:
disks = [ ''phy:sdb1,sdb1,w'',
''phy:sdb2,sdb2,w'', ''phy:sdb3,sdb3,w'' ... and
so
on.
>       Set the first entry in this list to calculate the>       offset of
the
domain''s root partition, based on the
>       domain ID. Set the second to the location of /usr if you
>       are sharing it between domains (e.g. disk >      
[''phy:your_hard_drive%d,sda1,w'' % (base_partition_number
>       + vmid), ''phy:your_usr_partition,sda6,r'' ]"
>
> I understand the Python array creation in that and nothing
> else :)
This is a more advanced feature of the comfig files, intended to allow you to 
pass an additional variable "vmid" into "xm create" and
automatically
generate the disk, network, etc settings for several domains using a single 
config file.  It''s rarely used and for your configuration you should
probably
ignore it.

Cheers,
Mark

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I''m really not following the ''disks'' documentation at
all.
If anyone could clear things up for me, I would appreciate
it.

I have 2 drives and intend to configure more than 1 domain.

1.  sda = Contains Fedora Core 3 + Twisted + iproute2 +
           brctl + Xen binary distribution.

           sda1 = /
           sda2 = swap
           sda3 = /tmp
           sda5 = /var
           sda6 = /data

2.  sdb = Contains a fresh install of Fedora Core 3 to
           be used for domains, as prompted by the following:

             "The first step in creating a new domain is
             to prepare a root filesystem for it to boot off.
             Typically, this might be stored in a normal
             partition, an LVM or other volume manager partition,
             a disk file or on an NFS server. A simple way to
             do this is simply to boot from your standard OS
             install CD and install the distribution into
             another partition on your hard drive."

           sdb1 = /
           sdb2 = swap
           sdb3 = /tmp
           sdb5 = /var
           sdb6 = /data

 From here, I completely don''t grasp what it is I am supposed
to do.

     "disk

      Set the first entry in this list to calculate the
      offset of the domain''s root partition, based on the
      domain ID. Set the second to the location of /usr if you
      are sharing it between domains (e.g. disk      
[''phy:your_hard_drive%d,sda1,w'' % (base_partition_number
      + vmid), ''phy:your_usr_partition,sda6,r'' ]"

I understand the Python array creation in that and nothing
else :)


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Thanks Mark.

The whole disk naming method did not work.  The specific
method did work.

I mknod''d /dev/console and /dev/null to fix the "Warning:
unable to open initial console" message/hang and have
VM1 running now.

Mark Williamson wrote:
>>2.  sdb = Contains a fresh install of Fedora Core 3 to
>>           be used for domains, as prompted by the following:
>>
>>             "The first step in creating a new domain is
>>             to prepare a root filesystem for it to boot off.
>>             Typically, this might be stored in a normal
>>             partition, an LVM or other volume manager partition,
>>             a disk file or on an NFS server. A simple way to
>>             do this is simply to boot from your standard OS
>>             install CD and install the distribution into
>>             another partition on your hard drive."
>>
>>           sdb1 = /
>>           sdb2 = swap
>>           sdb3 = /tmp
>>           sdb5 = /var
>>           sdb6 = /data
> 
> 
> Try:
> disks = [''phy:sdb,sdb,w'']
> 
> If that doesn''t work (I can''t remember if exporting whole
disks works) then
> export the partitions individually:
> disks = [ ''phy:sdb1,sdb1,w'',
''phy:sdb2,sdb2,w'', ''phy:sdb3,sdb3,w'' ... and
so
> on.
> 
> 
>>      Set the first entry in this list to calculate the>       offset
of the
> 
> domain''s root partition, based on the
> 
>>      domain ID. Set the second to the location of /usr if you
>>      are sharing it between domains (e.g. disk >>     
[''phy:your_hard_drive%d,sda1,w'' % (base_partition_number
>>      + vmid), ''phy:your_usr_partition,sda6,r'' ]"
>>
>>I understand the Python array creation in that and nothing
>>else :)
> 
> 
> This is a more advanced feature of the comfig files, intended to allow you
to
> pass an additional variable "vmid" into "xm create" and
automatically
> generate the disk, network, etc settings for several domains using a single
> config file.  It''s rarely used and for your configuration you
should probably
> ignore it.
> 
> Cheers,
> Mark
> 

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> The whole disk naming method did not work.  The specific 
> method did work.
If you''re using a Linux 2.6 dom0 you need to be using 2.0-testing or
xen-unstable  for this to work. 2.0.6 will have the fix when it is
relased.

Ian

 

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Jeff,

You should have a set of separate partitions (/, swap at least) for
each domain. Otherwise, when two or more domains try to write
on swap or any other file inside /, you may have a very bad
situation.

Also, how will you configure /etc files if you have only one /etc
for all domains?

2005/4/18, Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>:
> 
> > The whole disk naming method did not work.  The specific
> > method did work.
> 
> If you''re using a Linux 2.6 dom0 you need to be using 2.0-testing
or
> xen-unstable  for this to work. 2.0.6 will have the fix when it is
> relased.
> 
> Ian
> 
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
> 

-- 
Bye,
Fernando Maior
LPIC/1 31908

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Indeed, Fernando - I came to this realization late yesterday
myself :)  I appreciate the reply.

I have taken the 36GB sdb and mounted it as /vm-images in
domain 0 where I will use the sparse files method.

Is there no tidy way (yet) to make images from some root?
Just curious.

Fernando Maior wrote:
> Jeff,
> 
> You should have a set of separate partitions (/, swap at least) for
> each domain. Otherwise, when two or more domains try to write
> on swap or any other file inside /, you may have a very bad
> situation.
> 
> Also, how will you configure /etc files if you have only one /etc
> for all domains?
> 
> 2005/4/18, Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>:
> 
>>>The whole disk naming method did not work.  The specific
>>>method did work.
>>
>>If you''re using a Linux 2.6 dom0 you need to be using
2.0-testing or
>>xen-unstable  for this to work. 2.0.6 will have the fix when it is
>>relased.
>>
>>Ian
>>
>>
>>_______________________________________________
>>Xen-users mailing list
>>Xen-users@lists.xensource.com
>>http://lists.xensource.com/xen-users
>>
> 
> 
> 

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