On 03/21/2012 02:18 PM, David Lehman wrote: > On Wed, 2012-03-21 at 13:55 +0100, Jan Safranek wrote: >> >> start: 110592 end: 112454 length: 1863 >> This is a free space between two logical partitions. >> -> Again, why is the free region here? And there are 186 'hidden' >> sectors between this free space end and start of the next logical partition. > > 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. Please correct me if I am wrong - I understand it as the logical partition metadata is at sector 112455 (=end of the free space before+1), then there are 185 unused sectors because of alignment and the usable data on a partition starts at sector 112640, as reported by fdisk and storage.partitions. Nothing can ever touch these 186 sectors, because it might overwrite the metadata. >> If the alignment to cylinder boundary is cause of these weird numbers, >> can I turn the alignment off in pyanaconda.storage? The numbers >> reported by disks are completely artificial anyway these days. > > We turn off cylinder alignment already. What alignment is used then? Why the partitions don't follow each other? Jan >> /dev/sda6 90112 110591 10240 83 Linux >> /dev/sda7 112640 133119 10240 83 Linux _______________________________________________ Anaconda-devel-list mailing list Anaconda-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/anaconda-devel-list
