Re: [Xen-users] Partition DomU Filesystem

[Thomas Harold <tgh@xxxxxxxxxxxx>]

Michael Morris wrote:
> Hi,
>
> I'm trying to create multiple partitions within my DomU so that user 
> data can't fill up my space for logs.  I haven't found anything I could 
> use on Google, which made me think I needed to partition my DomU in a 
> "standard" way.  I tried this without any success.  I don't really know 
> much about partitioning except for what I do the first time I boot up my 
> machine and configure it.  I would really appreciate any suggestions for 
> how to partition my DomU.
I've noticed that the documentation over at XenSource doesn't cover this 
very clearly.  (They show the example for exporting a single partition 
to the DomU, but not how to do multiple partitions.)
What I do is create LVM logical volumes (lvcreate) in my primary volume 
group on the machine (LVM management happens in Dom0).  Then I give 
those to the DomU as /dev/sda1, /dev/sda2, /dev/sda3 which can be mapped 
inside the DomU's fstab to the proper folders.
The sordid details:

(2) 160GB drives in software RAID1 (mdadm managed inside the Dom0 
domain), the 5th partition is ~132GB and is a large LVM area that I chop 
into smaller bits using lvcreate for individual DomUs.  My LVM volume 
group is called "vgmirror", with logical volumes called "fw1root" and 
"fw1logs".  Which gives me:
/dev/vgmirror/fw1root (4GB)
/dev/vgmirror/fw1logs (4GB)

Looking at my /etc/xen/domu-fw1 file:

disk = [ 'phy:vgmirror/fw1root,sda1,w', 'phy:vgmirror/fw1logs,sda2,w' ]

Which exports it to the DomU as sda1 and sda2.

Hopefully that helps.  The DomU thinks that it's running on a non-RAID 
SATA drive with 2 partitions.
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