The root filesystem was mirrored, someone/something stopped mirroring, and increased / and /home to ridiculous values (/ got increased to 102gb and its only using 4.3gb, so 98gb is free). Can I reduce the / (/dev/hd4) filesytem down WITHOUT corrupting the the OS?
I would do a: chfs -a size=10g /dev/hd4.

This is AIX 6.1 TL9 SP8 (6100-09-08-1642). I would even reduce the Filesystem size by 1gb @10 times if I had to.

The ultimate end is to remove hdisk1 from the rootvg and re-add it back as a mirror.

These are 146gb disks
lsvg -l rootvg (and added up the PP's) shows I have 538PP's allocated, with 7PP free with a PPsize of 256mb (which is 1.7gb approx.). hd10opt is occupying 40PP's and is on hdisk1 (as seen with lslv -l hd10opt)


I have already reduced /home to only occupy hdisk0 (as shown with lslv -m hd9). / is on hdisk 0 as well.

I need to migratepv -l hd10opt hdisk1 hdisk0 but it reports not enough space (of course due to only 1.7gb free on hdisk0).

Code:

VG STATE:           active                   PP SIZE:        256 megabyte(s)
VG PERMISSION:      read/write               TOTAL PPs:      1092 (279552 megabytes)
MAX LVs:            256                      FREE PPs:       513 (131328 megabytes)
LVs:                13                       USED PPs:       579 (148224 megabytes)
OPEN LVs:           11                       QUORUM:         2 (Enabled)
TOTAL PVs:          2                        VG DESCRIPTORS: 3
STALE PVs:          0                        STALE PPs:      0
ACTIVE PVs:         2                        AUTO ON:        yes
MAX PPs per VG:     32512                                     
MAX PPs per PV:     1016                     MAX PVs:        32