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Full Discussion: LVM Memory Usage
Operating Systems Linux Red Hat LVM Memory Usage Post 302756945 by ikn3 on Wednesday 16th of January 2013 06:44:36 PM
Old 01-16-2013
LVM Memory Usage

Hello
I am using LVM to create volumes.

After creating the volumes using "lvcreate" and then formating them as "ext3".
I mounted these volumes to find around 40 -50GB space wasted.

Any suggestions why?

Code:
 # df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sdb1             111G   16G   90G  15% /
/dev/sda1              99M   24M   71M  25% /boot
tmpfs                 5.9G     0  5.9G   0% /dev/shm
/dev/mapper/vg_oracle-lv_u91
                      699G  197M  664G   1% /u91
/dev/mapper/vg_oracle-lv_u92
                      955G  200M  907G   1% /u92


Last edited by jim mcnamara; 01-16-2013 at 07:54 PM..
 

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

NAME
pvresize - resize a disk or partition in use by LVM2 SYNOPSIS
pvresize [-d|--debug] [-h|--help] [-t|--test] [-v|--verbose] [--version] [--setphysicalvolumesize size] PhysicalVolume [PhysicalVolume...] DESCRIPTION
pvresize resizes PhysicalVolume which may already be in a volume group and have active logical volumes allocated on it. OPTIONS
See lvm(8) for common options. --setphysicalvolumesize size Overrides the automatically-detected size of the PV. Use with care, or prior to reducing the physical size of the device. EXAMPLES
Expand the PV on /dev/sda1 after enlarging the partition with fdisk: pvresize /dev/sda1 Shrink the PV on /dev/sda1 prior to shrinking the partition with fdisk (ensure that the PV size is appropriate for your intended new parti- tion size): pvresize --setphysicalvolumesize 40G /dev/sda1 RESTRICTIONS
pvresize will refuse to shrink PhysicalVolume if it has allocated extents after where its new end would be. In the future, it should relo- cate these elsewhere in the volume group if there is sufficient free space, like pvmove does. pvresize won't currently work correctly on LVM1 volumes or PVs with extra metadata areas. SEE ALSO
lvm(8), pvmove(8), lvresize(8), fdisk(8) Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) PVRESIZE(8)
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