02-12-2015
"I wouldn't start from here"
If you were using LVM you could dynamically adjust partition sizes, if you were to back up the data on the existing partitions you could repartition the disk and copy the data back in. this would have the advantage of providing you with a backup
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PARTX(8) System Manager's Manual PARTX(8)
NAME
partx - telling the kernel about presence and numbering of on-disk partitions.
SYNOPSIS
partx [-a|-d|-l] [--type TYPE] [--nr M-N] [partition] disk
DESCRIPTION
Given a block device ( disk ) and a partition table type , try to parse the partition table, and list the contents. Optionally add or
remove partitions.
This is not an fdisk - adding and removing partitions is not a change of the disk, but just telling the kernel about presence and numbering
of on-disk partitions.
OPTIONS
-a add specified partitions or read disk and add all partitions
-d delete specified or all partitions
-l list partitions. Note that the all numbers are in 512-byte sectors.
--type TYPE
Specify the partition type -- dos, bsd, solaris, unixware or gpt.
--nr M-N
Specify the range of partitions (e.g --nr 2-4).
SEE ALSO
addpart(8), delpart(8), fdisk(8), parted(8), partprobe(8)
AVAILABILITY
The partx command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
11 Jan 2007 PARTX(8)