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Top Forums UNIX for Dummies Questions & Answers Unable to reduce the size of volume group? Post 302587062 by pinga123 on Wednesday 4th of January 2012 04:20:06 AM
Old 01-04-2012
^^No its not the case i want to reduce the size of harddisk (I mean virtual harddisk for e.g vmdk file in vmware ,img file in Oracle VM).

I m using Oracle VM 2.2.

There is one more issue now.
I somehow managed to reduce the size of virtual disk from 200 to 150 but i dont see any changes.

Code:
# fdisk -l

Disk /dev/xvda: 13.3 GB, 13316728320 bytes
255 heads, 63 sectors/track, 1619 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *           1          12       96358+  83  Linux
/dev/xvda2              13        1357    10803712+  83  Linux
/dev/xvda3            1358        1619     2104515   82  Linux swap / Solaris

Disk /dev/xvdb: 161.0 GB, 161061273600 bytes
255 heads, 63 sectors/track, 19581 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

    Device Boot      Start         End      Blocks   Id  System
/dev/xvdb1               1       26108   209712478+   5  Extended
/dev/xvdb5               1       26108   209712447   8e  Linux LVM

Disk /dev/xvdb is changed from 161.0 GB from 200GB.
but still vgdisplay is showing 200GB????


Code:
# vgdisplay
  --- Volume group ---
  VG Name               vg00
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  6
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               200.00 GB
  PE Size               4.00 MB
  Total PE              51199
  Alloc PE / Size       25600 / 100.00 GB
  Free  PE / Size       25599 / 100.00 GB
  VG UUID               NL5ws1-uaxQ-Wmtm-75GZ-WnQX-S7Vd-XeHJuS

---------- Post updated at 04:20 AM ---------- Previous update was at 04:14 AM ----------

Code:
# pvscan
  PV /dev/xvdb5   VG vg00   lvm2 [200.00 GB / 100.00 GB free]
  Total: 1 [200.00 GB] / in use: 1 [200.00 GB] / in no VG: 0 [0   ]

If you notice the above output /dev/xvdb5 is showing 200gb but actually it is 150 gb only
 

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FDISK(8)						      System Manager's Manual							  FDISK(8)

NAME
fdisk - partition a hard disk [IBM] SYNOPSIS
fdisk [-hm] [-sn] [file] OPTIONS
-h Number of disk heads is m -s Number of sectors per track is n EXAMPLES
fdisk /dev/hd0 # Examine disk partitions fdisk -h9 /dev/hd0 # Examine disk with 9 heads DESCRIPTION
When fdisk starts up, it reads in the partition table and displays it. It then presents a menu to allow the user to modify partitions, store the partition table on a file, or load it from a file. Partitions can be marked as MINIX, DOS or other, as well as active or not. Using fdisk is self-explanatory. However, be aware that repartitioning a disk will cause information on it to be lost. Rebooting the sys- tem immediately is mandatory after changing partition sizes and parameters. MINIX, XENIX, PC-IX, and MS-DOS all have different partition numbering schemes. Thus when using multiple systems on the same disk, be careful. Note that MINIX, unlike MS-DOS , cannot access the last sector in a partition with an odd number of sectors. The reason that odd partition sizes do not cause a problem with MS-DOS is that MS-DOS allocates disk space in units of 512-byte sectors, whereas MINIX uses 1K blocks. Fdisk has a variety of other features that can be seen by typing h. Fdisk normally knows the geometry of the device by asking the driver. You can use the -h and -s options to override the numbers found. SEE ALSO
part(8). FDISK(8)
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