On Mon, 2009-04-06 at 22:25 +0200, Joel Granados wrote:
> On Mon, Apr 06, 2009 at 02:58:54PM -0500, David Lehman wrote:
> > On Mon, 2009-04-06 at 21:50 +0200, Joel Granados wrote:
> > > On Mon, Apr 06, 2009 at 02:24:40PM -0500, David Lehman wrote:
> > > > On Mon, 2009-04-06 at 21:17 +0200, Joel Granados wrote:
> > > > > On Mon, Apr 06, 2009 at 12:36:38PM -0500, David Lehman wrote:
> > > > > > On Mon, 2009-04-06 at 19:24 +0200, Joel Granados Moreno wrote:
> > > > > > > ---
> > > > > > > storage/partitioning.py | 14 +++++++++++---
> > > > > > > 1 files changed, 11 insertions(+), 3 deletions(-)
> > > > > > >
> > > > > > > diff --git a/storage/partitioning.py b/storage/partitioning.py
> > > > > > > index eba0cb7..245d986 100644
> > > > > > > --- a/storage/partitioning.py
> > > > > > > +++ b/storage/partitioning.py
> > > > > > > @@ -755,17 +755,25 @@ def allocatePartitions(disks, partitions):
> > > > > > >
> > > > > > > # create minimum geometry for this request
> > > > > > > # req_size is in MB
> > > > > > > - sectors_per_track = disk.device.biosGeometry[2]
> > > > > BTW, is there any reason for having sectors_per_track besides playing
> > > > > nice with cylinder alignment.?
> > > >
> > > > It had nothing to do with cylinder alignment. I saw that the first
> > > > partition was expected to start at sector 63 and assumed that meant the
> > > > start of the second track.
> > >
> > > Well, in anycase, since we take out the free values from parted, there
> > > is no need to do this calculation. since free.start should give us a
> > > valid value (valid as in no less than its suppose to be).
> > >
> > > Or can free start become less that the firs free partition (numver=-1)
> > > start value?
> >
> > Yes -- parted will report the first free range as starting at sector 0
> > and then promptly fail when you try to add a partition at sector 0.
> > Brilliant.
>
> Well in this case we have one of two choices. leave the cylinder
> alignment thing in the partition geometry, or try to use the min_max
> approach, just not restricted to 1 sector but to sectors_per_track
> sectors and let parted do the intersecting.
> Will test the two tmrow see which is better.
I don't see what the problem is with leaving the max(63, start) thing in
there if that's one of the rules. No need to bring cylinder-alignment
into this -- all that max call does is make sure we don't try to start a
partition before sector 63.
Dave
> >
> >
> > >
> > > >
> > > > > > > length = (_part.req_size * (1024 * 1024)) / sectorSize
> > > > > > > new_geom = parted.Geometry(device=disk.device,
> > > > > > > - start=max(sectors_per_track, free.start),
> > > > > > > + start=free.start,
> > > > > > > length=length)
> > > > > > >
> > > > > > > + # create maximum and minimum geometries for constraint
> > > > > > > + max_geom = parted.Geometry(device=disk.device,
> > > > > > > + start=max(0 , free.start - 1),
> > > > > > > + length=min(length + 1, disk.device.length))
> > > > > >
> > > > > > Shouldn't this be more like
> > > > > >
> > > > > > start = max(0, free.start - 1)
> > > > > > max_geom = parted.Geometry(device=disk.device,
> > > > > > start=start,
> > > > > > length=min(length + 1, disk.device.length -
> > > > > > start))
> > > > > >
> > > > > > (since it seems possible for start to be non-zero in which case we
> > > > > > certainly don't want max to run off the end of the device. Or does
> > > > > > parted cover that for us?)
> > > > > >
> > > > > > > + min_geom = parted.Geometry(device=disk.device,
> > > > > > > + start=free.start + 1,
> > > > > > > + length=length-1)
> > > > > > > +
> > > > > > > +
> > > > > > > # create the partition and add it to the disk
> > > > > > > partition = parted.Partition(disk=disk,
> > > > > > > type=part_type,
> > > > > > > geometry=new_geom)
> > > > > > > - constraint = parted.Constraint(exactGeom=new_geom)
> > > > > > > + constraint = parted.Constraint(maxGeom=max_geom, minGeom=min_geom)
> > > > > > > disk.addPartition(partition=partition,
> > > > > > > constraint=constraint)
> > > > > > > log.debug("created partition %s of %dMB and added it to %s" %
> > > > > >
> > > > > > _______________________________________________
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> > > > >
> > > >
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