Re: [Xen-users] Guest O/S Questions

["Karsten M. Self" <karsten@xxxxxxxxxxxxx>]

Anthony Liguori wrote:

> Marcus Brown wrote:
>
> > > You're right.  fdisk (and AFAIK, modern partitioning tools) prefer to
> > > start partitions on the first cylinder boundary.  The assumption 
> > > here is
> > > that each cylinder contains 63 sectors.
> > >   
> > OK, but why skip this cylinder?
> > If you are creating an image with multiple partitions won't you need to
> > keep the partition table intact?
> >  
> Ok, let's back track a little.  The dd command I suggested is only 
> useful for extracting the first partition from a partitioned disk 
> image assuming that the first partition occupies all of the remaining 
> disk space and starts on the 63rd sector.
... *and* the goal is to end up with a filesystem image, *not* a 
partitioned file image.
Eg:  what's extracted is similar to what you'd get with:

  dd if=/dev/zero bs=1M seek=100 count=0 of=fs_image
  mke2fs -F fs_image
  mkdir mp
  mount -o loop -t ext2 fs_image mp

More traditional use of filesystem image files has been for files 
_without_ partition tables.
...or, to answer your question:  if you're extracting individual 
filesystems to their own file, you _don't_ need to keep the partition 
table intact.
--
Karsten M. Self <karsten@xxxxxxxxxxxxx>
XenSource, Inc.
2300 Geng Road #250                                +1 650.798.5900 x259
Palo Alto, CA 94303                                +1 650.493.1579 fax


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