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xen-devel
Re: [Xen-devel] ioctl 0000126c not supported by XL blkif
On Thu, 2006-12-07 at 11:15 -0800, Luke Crawford wrote:
> On Thu, 7 Dec 2006, Ian Campbell wrote:
> >
> > partx only makes this ioctl call if you have an odd number of sectors in
> > your diskimage, and only when trying to process an "EFI GUID Partition
> > Table" (whatever that is, I presume it is an IA64 thing, although the
> > partx code is unconditional).
>
> I see lots of references to "odd" partition sizes in my google, but I'm
> missing what 'odd' means in this context. 0dd as opposed to even? or
> odd as in "not aligning with cyl boundaries" or something like that?
> (I suppose my partitions listed below are odd in both respects)
Odd as opposed to even number of sectors.
> > I assume you aren't really using this type of partition table so I
> > expect it will fail harmlessly.
> >
> > Do you have a disk setup which might cause it to think it needs to try
> > the more unusual partition types? Perhaps you are using an unpartitioned
> > disk of an odd size? That reproduced it for me.
>
> we are using a systemimager floppy booted off qemu to create the DomU, so
> this is the same partition layout that would be given to a physical box.
>
> [root@DomU]# fdisk -l /dev/sda
>
> Disk /dev/sda: 36.5 GB, 36531973632 bytes
> 255 heads, 63 sectors/track, 4441 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sda1 * 1 16 128488+ 83 Linux
> /dev/sda2 17 669 5245222+ 83 Linux
> /dev/sda3 670 799 1044225 83 Linux
> /dev/sda4 800 4441 29254365 f Win95 Ext'd (LBA)
> /dev/sda5 800 930 1052226 83 Linux
> /dev/sda6 931 4441 28202076 83 Linux
That would do it.
I'm going to remove the message tomorrow -- all of the other kernel
ports have it commented out already. It was only really useful during
development anyway.
Cheers,
Ian.
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