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Re: [Xen-users] Questions on qcow, qcow2 versus LVM

To: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Subject: Re: [Xen-users] Questions on qcow, qcow2 versus LVM
From: "Matthew Law" <matt@xxxxxxxxxxxxxxxxxx>
Date: Tue, 29 Dec 2009 23:35:48 -0000
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I found this thread:


I am hoping that a more recent version of gnu parted might fix it.  My
dom0 has parted-1.8.1-23.el5.



On Tue, December 29, 2009 10:04 pm, Fajar A. Nugraha wrote:
> On Tue, Dec 29, 2009 at 11:56 PM, Matthew Law <matt@xxxxxxxxxxxxxxxxxx>
> wrote:
>> I've just done some tests on this and you are absolutely right: with no
>> partitions it works fine, so either parted, kpartx or whatever is
>> causing
>> the problem.  Now my problem is that I can't run a partitionless volume
>> because I absolutely need to use pvgrub and that doesn't seem to work
> Yes, that seems to be the case (at least with 3.4.1)
>> without a proper partition table in place or I have screwed up
>> somewhere?
> You might be able to compile xen-unstable and take its pvgrub. Should
> work.
> http://old.nabble.com/-xen-unstable--pvgrub:-Allow-to-work-with-a-partitionless-virtual-disc.-p19609135.html
> Another way to is to investigate why your earlier setup has problems.
> To eliminate partition problems, you can map the disk to dom0  like
> this:
> modprobe xenblk
> xm block-attach 0 phy:/dev/vg_name/lv_name xvda w
> ### do your stuff here. fdisk xvda, mkfs, ta, whatever. Use fdisk
> instead of parted.
> ### don't forget to umount afterwards
> xm block-list 0
> xm block-detach 0 51712 <== 51712 is the devid for xvda
> If that works, then it's 100% confirmed the problem is with
> parted/kpartx. Repeat the test, but this time using parted instead of
> fdisk, and you get the idea :D

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