10-21-2014
Simple data juggling. First you need to find where you have space. Otherwise, you need to figure out what you can remove.
It takes space to manipulate space.
If the goal is to keep /usr where it is, then you'd have to move areas that are against it contiguously as far as disk sectors are concerned. You haven't supplied enough information to assess that.
Another approach might be to move /usr altogether to as different disk and/or partition.
Either way, you'll need to boot into some sort of rescue shell to do the work ideally.
I mean, if there's a ton of space available somewhere, you might be able to avoid that, but because there can be a good chance of error, you'll want to be able to get to a rescue shell (and test that out) before beginning the work. Just so that you don't lock yourself completely out.
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DISKPART(8) System Manager's Manual DISKPART(8)
NAME
diskpart - calculate default disk partition sizes
SYNOPSIS
/usr/sbin/diskpart [ -p ] [ -d ] disk-type
DESCRIPTION
Diskpart is used to calculate the disk partition sizes based on the default rules used at Berkeley. If the -p option is supplied, tables
suitable for inclusion in a device driver are produced. If the -d option is supplied, an entry suitable for inclusion in the disk descrip-
tion file /etc/disktab is generated; c.f. disktab(5). On disks that use bad144-style bad-sector forwarding, space is left in the last
partition on the disk for a bad sector forwarding table. The space reserved is one track for the replicated copies of the table and suffi-
cient tracks to hold a pool of 126 sectors to which bad sectors are mapped. For more information, see bad144(8).
The disk partition sizes are based on the total amount of space on the disk as given in the table below (all values are supplied in units
of 512 byte sectors). The `c' partition is, by convention, used to access the entire physical disk. The device driver tables include the
space reserved for the bad sector forwarding table in the `c' partition; those used in the disktab and default formats exclude reserved
tracks. In normal operation, either the `g' partition is used, or the `d', `e', and `f' partitions are used. The `g' and `f' partitions
are variable-sized, occupying whatever space remains after allocation of the fixed sized partitions. If the disk is smaller than 20
Megabytes, then diskpart aborts with the message ``disk too small, calculate by hand''.
Partition 20-60 MB 61-205 MB 206-355 MB 356+ MB
a 15884 15884 15884 15884
b 10032 33440 33440 66880
d 15884 15884 15884 15884
e unused 55936 55936 307200
h unused unused 291346 291346
If an unknown disk type is specified, diskpart will prompt for the required disk geometry information.
SEE ALSO
disktab(5), bad144(8)
BUGS
Certain default partition sizes are based on historical artifacts (e.g. RP06), and may result in unsatisfactory layouts.
When using the -d flag, alternate disk names are not included in the output.
4th Berkeley Distribution November 17, 1996 DISKPART(8)