Re: [Xen-devel] sfdisk -g support in DomU

[Gerd Knorr <kraxel@xxxxxxx>]

> > support for disk geometry. So, any application that uses 
> > "sfdisk -g" to get the geometry of a partition, or disk, will 
> > fail when run in DomU.
> > Is this a deliberate omission?
IMHO the applications should be fixed to not depend on the disk 
geometry.  There is LBA addressing for disks since ages, all the CHS 
addressing you still find are some more or less random, artificial 
values picked to satisfy prehistoric software ;)
> Most people tend to import block devices as partitions rather than whole
> disks, so often there isn't a 'whole disk' device to interogate (though
> I guess a partition table for it could be faked out if anyone really
> cared). Importing partitions rather than whole disks makes resizing of
> indidual partitions easier.
I prefeare whole disks, works fine for me, nobody seems to care much 
about the geometry these days:
localhost ~ # cat /proc/partitions
major minor  #blocks  name

 202     0    4194304 xvda
 202     1    3750000 xvda1
 202     2     250000 xvda2
localhost ~ # parted /dev/xvda print
Disk geometry for /dev/xvda: 0kB - 4295MB
Disk label type: msdos
Number  Start   End     Size    Type      File system  Flags
1       1kB     3840MB  3840MB  primary   ext2
2       3840MB  4096MB  256MB   primary   linux-swap
Information: Don't forget to update /etc/fstab, if necessary.

localhost ~ # sfdisk -l /dev/xvda
Disk /dev/xvda: cannot get geometry

Disk /dev/xvda: 0 cylinders, 0 heads, 0 sectors/track
Units = mebibytes of 1048576 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start   End    MiB    #blocks   Id  System
/dev/xvda1         0+  3662-  3663-   3750000   83  Linux
/dev/xvda2      3662+  3906-   245-    250000   82  Linux swap / Solaris
/dev/xvda3         0      -      0          0    0  Empty
/dev/xvda4         0      -      0          0    0  Empty
localhost ~ #

The only issue I trapped into so far is that the yast2 installer 
appearently doesn't like disks which have neither some geometry nor an 
existing partition table ...
cheers,

  Gerd

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