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xen-users
Re: [Xen-users] ramdisk option in domU config file does not work
Li Ge wrote:
This problem seems to have something to do with the size of the
ramdisk file. But I am not quite sure.
I tried it on different distros(SLES9, RHEL4, FC3). Here is what I
observed:
1. Can not create domU with ramdisk option using the domU initrd file
(1.2 MB) of SLES9 or the domU initrd file (1.4 MB) of RHEL.
2. I can create domU on one RHEL box with ramdisk option using the
initrd-2.6.12-xenU file copied from another Fedora Core box, which has
relatively smaller file size (300KB). But using the original ramdisk
file of RHEL, I failed to create domU.
Is there a limitation for ramdisk file size, for example <1M?
The typically limitation is 4MB which is what our default ramdisk size is.
Please note, that you cannot use out-of-the-box ramdisk that come from
distros as they contain kernel modules that have not been compiled for
Xen. You must make a ramdisk with the appropriate utilities.
Dave might be running into the same problem.
Regards,
Anthony Liguori
Thanks,
Li
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Sent by: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
07/26/2005 02:26 PM
To
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cc
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Subject
Re: [Xen-users] ramdisk option in domU config file does not work
I have 1GB of memory on my machine, of which 756 are free. Whenever I
try to start a DomU with an initrd file, I get the same error that Li Ge
reported:
Using config file "vm1.cfg".
Error: Error creating domain: (0, 'Error')
DomU will start just fine without the initrd; however, in one case where
I have a DomU with a Reiser FS, I need to be able to use the initrd (I
know I can build support for Reiser into the kernel, but that is not the
point).
On Tue, 2005-07-26 at 11:18 +0200, Boris Lenzinger wrote:
> Hi,
>
> I had this problem (well I think it was the same): you do not have
> enough free memory to run your instance.
>
> run:
> xm info
>
> It will tell you how much free memory you have.
> First solution is to decrease the memory in the configuration to check
> if you can run your configuration.
> If it is working (and you need more memory), decrease memory of dom0.
>
> If still not working, what is the log file saying ? (/var/log/xend.log
> on a fedora distribution)
>
> Boris
>
> Li Ge wrote:
>
> > Hi,
> > I added ramdisk option in domU config file to let it load initrd when
> > domU is booting up. I got the follow error message:
> >
> > # xm create /root/vm1.cfg -c
> > Using config file "/root/vm1.cfg".
> > Error: Error creating domain: (0, 'Error')
> >
> > When I commented the ramdisk option out, the problem went away and I
> > could start domU without a problem. Here is the domU config file I
used:
> >
> > # Kernel image file.
> > kernel = "/boot/vmlinuz-2.6-xenU"
> >
> > # Optional ramdisk.
> > #ramdisk = "/boot/initrd-2.6.12-xenU-reiserFS"
> > ramdisk = "/boot/initrd-2.6.12-xenU"
> >
> > # Initial memory allocation (in megabytes) for the new domain.
> > memory = 128
> >
> > # A name for your domain. All domains must have different names.
> > name = "vm1"
> >
> > disk = [ 'phy:sda7,hda1,w' ]
> >
> > # Set if you want dhcp to allocate the IP address.
> > #dhcp="dhcp"
> > # Set netmask.
> > #netmask=
> > # Set default gateway.
> > #gateway=
> > # Set the hostname.
> > #hostname= "vm%d" % vmid
> >
> > # Set root device.
> > root = "/dev/hda1 ro"
> >
> > # Sets runlevel 4.
> > extra = "4"
> >
> > Could it be something I've missed? The xen version is the
xen-unstable
> > tree with latest changeset 5814.
> >
> > Thanks,
> > Li
> >
>
>------------------------------------------------------------------------
> >
> >_______________________________________________
> >Xen-users mailing list
> >Xen-users@xxxxxxxxxxxxxxxxxxx
> >http://lists.xensource.com/xen-users
> >
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>
--
Regards,
David F Barrera
Linux Technology Center
Systems and Technology Group, IBM
"The wisest men follow their own direction. "
Euripides
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