[Cialug] Aligning blocks with fdisk

[Kyle H]

You need to worry about start and end blocks, new partitions start at num
blocks +1. you have them overlapping by a shared block is what im seeing.
you have multiple partitions sdb starting at block 1131. Hope this helps,
im usually good with partitioning and data recovery and i enjoy it :)

kyle

On Thu, Sep 24, 2020 at 8:19 AM Mike Hughes <mike at visionary.com> wrote:

> Hi group,
>
>
>
> In attempting to grow a partition the boundaries seem to be different and
> I've lost access to the underlying filesystem.
>
>
>
> This is a screenshot from the original pre-operation disk, taken from the
> built-in fdisk on CentOS 5 (yes I know how outdated this is):
>
>
>
> [Cent-5:root at larry2 ~]# df -hPT
>
> Filesystem    Type    Size  Used Avail Use% Mounted on
>
> /dev/sdb1     ext3    8.4G  7.9G   75M 100% /
>
> /dev/sda1     ext3     99M   41M   54M  43% /boot
>
>
>
> [Cent-5:root at larry2 ~]# fdisk -l
>
> Disk /dev/sda: 108 MB, 108134400 bytes
>
> 4 heads, 32 sectors/track, 1650 cylinders
>
> Units = cylinders of 128 * 512 = 65536 bytes
>
> Device Boot      Start         End      Blocks   Id  System
>
> /dev/sda1   *           2        1633      104448   83  Linux
>
>
>
> Disk /dev/sdb: 21.4 GB, 21474836480 bytes
>
> 255 heads, 63 sectors/track, 2610 cylinders
>
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Device Boot      Start         End      Blocks   Id  System
>
> /dev/sdb1               1        1131     9076736   83  Linux
>
> Partition 1 does not end on cylinder boundary.
>
> /dev/sdb2            1131        1261     1048640    5  Extended
>
> Partition 2 does not end on cylinder boundary.
>
> /dev/sdb5            1131        1261     1048576   82  Linux swap /
> Solaris
>
>
>
> And this is what I get when I attempt to recreate the partition from a
> live rescue disk running CentOS 6:
>
>
>
> [cid:2014d7e3-75b8-4e7a-8a01-3ded8a47c082]
>
>
>
> So the original one ended at 9076736, but the new one, with the same
> number of cylinders is ending at 9083733.
>
>
>
> Anyone familiar with the gymnastics necessary to bring this back online?
>
>
>
>
>
> Michael Hughes // System Administrator
>
>
>
> Visionary Services, Inc.
>
>
>
> 300 East Locust St., Suite 250
>
>
>
> Des Moines, IA 50309
>
>
>
>
>
>
>
> Phone: 515.369.3545 ext.116<tel:515-369-3545,116>
>
>
>
> Toll-free: 888.303.2848 ext.116<tel:888-303-2848,116>
>
>
>
> Cell 515.661.4343<tel:515-661-4343>
>
>
>
> Website: visionary.com
>
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