On Jun 12, 2007, at 8:08 PM, Tarun Reddy wrote:
On Jun 12, 2007, at 4:56 PM, Tom Horsley wrote:
On Tue, 12 Jun 2007 12:16:44 -0600
Tarun Reddy <treddy@xxxxxxxxxxxx> wrote:
I'm using Centos 5 dom0 on an x86_64 machine with 12GB of RAM.
Tried to use virt-manager to install a Centos 4 domU (also tried
with
Centos 5 domU) but the tool limits the disk to 16000 MB. So
switch to
using virt-install and specified an 80GB disk. Everything proceed
well until "Formatting / file system" which stops at 11% (~8GB of
the
74GB / partition).
Seems likely it might be the same bug as:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=234160
If you look at the VM you are trying to install in the virt-manager
app, is it using as much CPU as it can get?
Thank you for the pointer! The load on the host shows 1 x number of
guest hosts during those pauses. It did eventually finish the
install but it took almost 2 hours with a local Centos mirror!
So looking at the bugzilla report, I noticed I didn't mention that
I was using paravirtualized guest domains. Of course, the bug in
bugzilla originally references fully virtualized guests. So, on a
whim, I try a Centos 4.5 guest os fully virtualized. Apart from
having to add noapic to my kernel boot line, it seems much more
stable with no pauses at all. Go figure.
I was hoping to use a paravirtualized since I thought it might be
faster.
Of course on a 32 bit Intel box (older Xeons), I have no issues
with paravirtualized hosts, either Centos 5 or 4.5.
Less baffled now.
The difference between the pause state and non-paused state is *not*
para versus fully virtualized systems as I thought. Rather it was
sparse versus non-sparse disk images.
I had started using virt-install since I couldn't get virt-manager to
set up a disk image bigger that 16GB. By default virt-install uses
sparse disks (versus virt-manager which defaults to non-sparse
disks). Hence, the dramatic pauses that involved anything large I/O
to the disk. Fortunately, there are nice command line switches that
allow changing of that and I am now running paravirtualized Centos 5
guest without pauses (Centos 4.5 installing as we speak).
Thanks for your help!
Tarun
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