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How to remove the one LE via fsadm and lvreduce method

How to remove the one LE via fsadm and lvreduce method. If data is fragmented , it is Good advice to run defragmentation step before going for shrinking of File system.

[root@sandbox:/tmp]#

#-> bdf /usr

Filesystem kbytes used avail %used Mounted on

/dev/vg00/lvol9 8388608 3968860 4143896 49% /usr

[root@sandbox:/tmp]#

#-> vgdisplay /dev/vg00

--- Volume groups ---

VG Name /dev/vg00

VG Write Access read/write

VG Status available

Max LV 255

Cur LV 14

Open LV 14

Max PV 16

Cur PV 2

Act PV 2

Max PE per PV 5000

VGDA 4

PE Size (Mbytes) 16 ----------one PE size.

Total PE 8748

Alloc PE 7026

Free PE 1722

Total PVG 0

Total Spare PVs 0

Total Spare PVs in use 0

[root@sandbox:/tmp]#

#-> lvdisplay -v /dev/vg00/lvol9 |tail

00503 /dev/dsk/c2t1d0 02645 current /dev/dsk/c2t0d0 02773 current

00504 /dev/dsk/c2t1d0 02646 current /dev/dsk/c2t0d0 02774 current

00505 /dev/dsk/c2t1d0 02647 current /dev/dsk/c2t0d0 02775 current

00506 /dev/dsk/c2t1d0 02648 current /dev/dsk/c2t0d0 02776 current

00507 /dev/dsk/c2t1d0 02649 current /dev/dsk/c2t0d0 02777 current

00508 /dev/dsk/c2t1d0 02650 current /dev/dsk/c2t0d0 02778 current

00509 /dev/dsk/c2t1d0 02651 current /dev/dsk/c2t0d0 02779 current

00510 /dev/dsk/c2t1d0 02652 current /dev/dsk/c2t0d0 02780 current

00511 /dev/dsk/c2t1d0 02653 current /dev/dsk/c2t0d0 02781 current

[root@sandbox:/tmp]#

#->

[root@sandbox:/tmp]#

#->

[root@sandbox:/tmp]#

#-> lvdisplay /dev/vg00/lvol9

--- Logical volumes ---

LV Name /dev/vg00/lvol9

VG Name /dev/vg00

LV Permission read/write

LV Status available/syncd

Mirror copies 1

Consistency Recovery MWC

Schedule parallel

LV Size (Mbytes) 8192

Current LE 512

Allocated PE 1024

Stripes 0

Stripe Size (Kbytes) 0

Bad block on

Allocation strict

IO Timeout (Seconds) default

[root@sandbox:/tmp]#

#-> bc

8192-16

8176

[root@sandbox:/tmp]#

#-> fsadm -b 8176M /usr

fsadm: /etc/default/fs is used for determining the file system type

vxfs fsadm: /dev/vg00/rlvol9 is currently 8388608 sectors - size will be reduced

vxfs fsadm: allocations found in shrink range, moving data

[root@sandbox:/tmp]#

#-> bdf /usr

Filesystem kbytes used avail %used Mounted on

/dev/vg00/lvol9 8372224 3968860 4128536 49% /usr

[root@sandbox:/tmp]#

#-> lvreduce -L 8176 /dev/vg00/lvol9

When a logical volume is reduced useful data might get lost;

do you really want the command to proceed (y/n) : y

Logical volume "/dev/vg00/lvol9" has been successfully reduced.

Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf

[root@sandbox:/tmp]#

#-> lvdisplay /dev/vg00/lvol9

--- Logical volumes ---

LV Name /dev/vg00/lvol9

VG Name /dev/vg00

LV Permission read/write

LV Status available/syncd

Mirror copies 1

Consistency Recovery MWC

Schedule parallel

LV Size (Mbytes) 8176

Current LE 511

Allocated PE 1022

Stripes 0

Stripe Size (Kbytes) 0

Bad block on

Allocation strict

IO Timeout (Seconds) default

[root@sandbox:/tmp]#

#-> lvdisplay -v /dev/vg00/lvol9 |tail

00502 /dev/dsk/c2t1d0 02644 current /dev/dsk/c2t0d0 02772 current