On Fri, 2012-03-23 at 12:44 +0100, Jan Safranek wrote: > On 03/21/2012 02:18 PM, David Lehman wrote: > >> start: 63551 end: 64259 length: 709 > >> > This free region is at the beginning of the extended partition. The > >> > extended partition starts at sector 63488 and the first logical > >> > partition starts at 67584. > >> > -> Why there is a free space at all? I did not request any. > >> > -> What are 3325 sectors between the free space end and the first > >> > logical partition start? I know, there is one sector for logical > >> > partition metadata, but 1.6MB, which is not part of any partition nor > >> > free space region, seems too much to me. > >> > -> Similarly, what are 63 sectors between the extended partition start > >> > and the free space start? 1 sector is for logical partition metadata, > >> > but the rest? > > > > We are somewhat more liberal with rounding start sector up for logical > > partitions, basically because parted is more aggressive in aligning > > start of logical partitions than it is with normal partitions. Also, we > > need to account for at least one sector of metadata before each logical > > partition. In some unfortunate cases this bump to the next MB boundary > > can amount to 2047 520-byte sectors. Again, parted is so aggressive with > > this that we had to do the same in order to ensure that parted > > magic/fixups do not cause unwanted surprises when the partitions are > > added to disk. > > > > Ok, I understand the free space *between* logical partitions. But the > above is the first logical partition. Looking at the raw partition data > (obtained by cfdisk), I can see that the first logical partition > metadata are at sector 63488, i.e. the first sector of the extended > partition. The real partition data starts at sector 67584, which is 2 > megabytes (!) after the metadata. I would expect just 1 megabyte > between, for the alignment. But that's something I can live with. > > What troubles me much more is that > pyanaconda.storage.partitioning.getFreeRegions() reports a free region > in these 2 megabytes between logical partition metadata and real > partition data! IMHO nothing should be allowed there! getFreeRegions does not claim that you are allowed to create partitions within every free region it reports. _______________________________________________ Anaconda-devel-list mailing list Anaconda-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/anaconda-devel-list
