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Re: [Xen-users] XCP default partition layout?

  • To: xen-users@xxxxxxxxxxxxx
  • From: Alexandre Kouznetsov <alk@xxxxxxxxxx>
  • Date: Thu, 16 Aug 2012 12:32:56 -0500
  • Delivery-date: Thu, 16 Aug 2012 17:34:15 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>


El 15/08/12 23:09, John Morris escribió:
The XCP installer creates two partitions of about 4GB each on the first
disk.  The first is the root / filesystem, clear enough.  I can't seem
to find any documentation about it.  The beginning appears to contain
all NULLs, and 'strings' finds nothing human-legible in it.

Anyone know what that partition is for?  Can it be removed, or else
moved to the beginning of the second disk?
XCP team would be the authoritative source for that answer.

So far, it seems like the second partition could be reserved for upgrades. The upgrade may be installed on the reserved partition, inf something goes wrong you can easily roll back to the previous installation. This is just a hypothesis.

I guess you can do whatever you wish with the partitions, Linux is very transparent for this kind of modifications. Just make sure to update references in fstab and stuff.

Personally, I would advice against it. XCP is a consistent, compact system, made to have a _very_ predictable behavior. If you start to mess with it beyond the expectation of the developers, you are risking to find all sort of dark places. In that case, you better go for Debian/CentOS/whatever, with regular Xen hypervisor and XenAPI.

In order to dedicate the HDD to the DomU's, consider installing the host system on a USB flash drive. Some server have a nice internal USB connector. In case of XCP, it will require some tricks to make it boot (re-build initrd), but it's less invasive than re-ordering partitions. You will need at least 16GB drive. It is also possibleto install it on a 4GB drive, that is slightly more invasive.

Alexandre Kouznetsov

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