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Operating Systems Linux Red Hat Shrink LVM partition & create new Linux Primary partition Post 302910622 by gr8_usk on Saturday 26th of July 2014 12:11:54 AM
Old 07-26-2014
Shrink LVM partition & create new Linux Primary partition

Hello All,

I have a Red Hat Linux 5.9 Server installed with one hard disk & 2 Partitions created on it as follows,

/boot - Linux Partition & another is
LVM - One VG & under that 5-6 Logical volumes(var,opt,home etc).

Here my requirement is to take out 1GB of space from LVM ( Any logical partition & OK with data loss as well) & create a separate new primary Linux partition of that 1 GB space. I am not sure whether it is possible OR not, if possible can you help me provide the steps/commands how to do that.

So far I have tried doing following things after googling & got information from other forums, but so far not got success,

1] Booted in single user mode
2] Unmounted the logical partition which need to shrink
3] Run e2fsck -f /opt
4] resize2fs -p /opt
5] lvreduce -L 1G /opt
6] Saw after mounting, size got reduced

After doing above step, I tried creating partition with fdisk, but it wont allow, moreover I can't see this 1GB free space also in fdisk.

Please help.
 

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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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