[Cialug] Aligning blocks with fdisk

[Mike Hughes]

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This is a screenshot from the original pre-operation disk, taken from the built-in fdisk on CentOS 5 (yes I know how outdated this is):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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 39239 bytes
Desc: image.png
URL: <http://www.cialug.org/pipermail/cialug/attachments/20200924/cdd505eb/attachment-0001.png>