*Bump* Has anyone looked into this? Thank you.
On Wednesday, June 15, 2011 7:04:14 PM ben wrote: > This is an example of the problem with > ped_disk_get_max_partition_geometry(). With three partitions I ask > libparted for a maximum geometry on the last two. In both cases it is > smaller than it could be by a wide margin. > > > **** FDISK OUTPUT **** > Start: 1951415550 > End : 1953520064 > > Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes > 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors > Units = sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x0000f013 > > Device Boot Start End Blocks Id System > /dev/sdc1 2048 2097215 1047584 83 Linux > /dev/sdc2 1951422464 1953520063 1048800 83 Linux > /dev/sdc3 1949317120 1951415548 1049214+ 83 Linux > > > **** libparted partion layout **** > > Type: 8 > Start: 0 > End: 62 > > Type: 4 > Start: 63 > End: 2047 > > Type: 0 <-- first partition > Start: 2048 > End: 2097215 > > Type: 4 > Start: 2097216 > End: 1949317119 > > Type: 0 <-- second partiton > Start: 1949317120 > End: 1951415548 > > Type: 4 > Start: 1951415549 > End: 1951422463 > > Type: 0 <-- third partition > Start: 1951422464 > End: 1953520063 > > Type: 4 > Start: 1953520064 > End: 1953520064 > > Type: 8 > Start: 1953520065 > End: 1953525167 > > > **** results for max geometry -- constraint any **** > > Maximum geometry for 2nd partition > Start: 2104515 > End : 1951415549 > > The first partition ends at 2097215 but libparted > puts the start of a maximized partition at 2104515 > which is 7300 sectors or 3.7 megs later. > > > > Maximum geometry for 3rd partition > Start: 1951415550 > End : 1953520064 > > Here the beginning is right but the end at 1953520064 is > short of 1953525167 by 5103 sectors or 2.6 meg. > > > **** A different setup **** > > > **** FDISK **** > > Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes > 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors > Units = sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x000e6efb > > Device Boot Start End Blocks Id System > /dev/sdc1 976760832 1953520064 488379616+ 5 Extended > /dev/sdc2 2048 390704370 195351161+ 83 Linux > /dev/sdc3 390717440 402438236 5860398+ 83 Linux > > > **** liblvm **** > > Start: 0 > End: 62 > > Type: 4 > Start: 63 > End: 2047 > > Type: 0 > Start: 2048 > End: 390704370 > > Type: 4 > Start: 390704371 > End: 390717439 > > Type: 0 <--- partition to maximize > Start: 390717440 > End: 402438236 > > Type: 4 > Start: 402438237 > End: 976760831 > > Type: 2 > Start: 976760832 > End: 1953520064 > > Type: 9 > Start: 976760832 > End: 976760894 > > Type: 5 > Start: 976760895 > End: 1953520064 > > Type: 8 > Start: 1953520065 > End: 1953525167 > > **** results for max geometry -- constraint any **** > > Maximum geometry for partition number 2 > Start: 390716865 > End : 976751999 > > > The partition has 13069 sectors or 6.7 megabytes of room > before the start and yet only gets 575 sectors from libparted. > After the end it can go to 976760832 but libparted puts > the end at only 976751999 which is 8833 sectors short or > 4.5 megs off. > > The results here are with a 1.0 TB drive but small drives can do the > same. I have actually seen significantly worse rsults but I haven't > been able to replicate them yet. Thank you for looking into this > issue. > > _______________________________________________ > bug-parted mailing list > bug-parted@gnu.org > https://lists.gnu.org/mailman/listinfo/bug-parted _______________________________________________ bug-parted mailing list bug-parted@gnu.org https://lists.gnu.org/mailman/listinfo/bug-parted