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.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi, there. I know FreeBSD must be installed in primary and Linux can be installed in extended. What about NetBSD, OpenBSD and Solaris for x86? They must be installed in primary, too? (4 Replies)
Discussion started by: HOUSCOUS
4 Replies
2. Linux
Well Guys, will anybody solve my problem?
I have installed Win XP and RH Linux 9 (Dual Boot) on an Intel x86 Machine. Everything is going fine except that I cannot share files among the two operating systems. For example, if I download a PDF file from internet and save it in my Win XP partition... (1 Reply)
Discussion started by: Jawwad
1 Replies
3. Linux
i want to create on directory called /data under "/ " . but when i m using
mkdir /data it is telling permission denied. could any one tell me how to do it ? (1 Reply)
Discussion started by: useless79
1 Replies
4. Linux
hi
I am trying to create primary,extended and logical partitions.
when I try to create a primary partition, I can give it maximum 1027M (1gb). Why? (9 Replies)
Discussion started by: tjay83
9 Replies
5. UNIX for Advanced & Expert Users
I want to backup my partitions by shrinking it my issue is like
I want to create a new disk copy from only the used blocks I my current image.
How would I redirect the output of resize2fs to new disk and dd the current
partition so that I can boot my new image without issues and also without... (3 Replies)
Discussion started by: amol28kulkarni
3 Replies
6. UNIX for Dummies Questions & Answers
Hi Guys,
I m using redhat 6, I have installed root partition as non-LVM .
Is there any way i can convert it to LVM? (1 Reply)
Discussion started by: pinga123
1 Replies
7. UNIX for Advanced & Expert Users
My root file system is of type LVM. i wanna shrink it but unable to do so.
When i give the below command:
resize2fs /dev/mapper/VolGroup00-VolLog00 10000M
it messages that online shrink can't can't be done as the logical volume is mounted on /. i switched to single user mode by giving command:... (2 Replies)
Discussion started by: ravisingh
2 Replies
8. Red Hat
Hi,
I need a suggesstion i have 2 disk if i installed OS / root partition by making Lvm in one disk and data in other disk also with the lvm, means 2 different lvms.
Is making LVM partition for OS disk will the performacne will be good?
Can i make 2 different lvm one is for OS and other for... (1 Reply)
Discussion started by: Rahulne25
1 Replies
9. Red Hat
Hi ,
Background : I am installing the KVM based RHEL OS VM on one of the HP pro-line physical server.
Issue: While doing custom layout partition, i want to create partition lvm based , for example :lv_root.
But problem is that, whenever i am creating the partition, its showing /sda1... (2 Replies)
Discussion started by: Nats
2 Replies
10. UNIX for Beginners Questions & Answers
Hello,
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 1024M 0 rom
sda 8:0 0 38.2G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 ... (2 Replies)
Discussion started by: centosadmin
2 Replies
LEARN ABOUT REDHAT
lvmcreate_initrd
LVMCREATE_INITRD(8) System Manager's Manual LVMCREATE_INITRD(8)
NAME
lvmcreate_initrd - create an initial ramdisk to boot with root on a logical volume
SYNOPSIS
lvcmreate_initrd [-i|--iop IOP] [-D|--devfs] [-v|--verbose] [-V|--version] [KernelVersion]
DESCRIPTION
lvmcreate_initrd creates a new compressed initial ramdisk /boot/initrd-lvm-KernelVersion.gz. The initial ramdisk contains all necessary
binaries, shared libraries and a linuxrc file to switch to a logical volume based root filesystem. To build an initial ramdisk for a ker-
nel other than the one currently running add the KernelVersion parameter (e.g. lvmcreate_initrd 2.3.25) on the command line.
OPTIONS
-h, --help
Print a usage message on standard output and exit.
-i, --iop IOP
Specify the LVM kernel IOP version if you are using wrapper scripts in /sbin. This is only necessary if you are building an initrd
for a kernel other than the current one, and you have tools for multiple IOP versions installed.
-D, --devfs
Force the use of devfs when building the initrd. lvmcreate_initrd by default probes for devfs by checking for /dev/.devfsd, which
is created by devfsd when it is running. This option will force lvmcreate_initrd to do this, when devfsd is not currently running.
-v, --verbose
Gives verbose runtime information about the creation of the ram disk image.
-V, --version
Print version number and exit successfully.
The necessary actions to change your system into a "root on logical volume" one are:
Create a small (~20MB) partition which is BIOS reachable to hold the /boot filesystem (if you already have a small partition based root
filesystem this can be used instead). If you want to boot standalone from this partition in an emergency, copy all the necessary binaries
and libraries to that filesystem as well and create a corresponding /etc/lilo.conf entry. In order to be able to edit lilo.conf when booted
standalone, you should move /etc/lilo.conf to /boot/lilo.conf and create a symbolic link to it in /etc. This is not needed if you have a
boot/root floppy which contains the LVM binaries and the library.
Create all logical volumes you need (for root, usr, opt etc.), create filesystems in them, mount them and transfer all files from the par-
tition based filesystems into the logical volume based ones.
Set up your /etc/lilo.conf with a boot configuration like:
image = /boot/vmlinuz
initrd = /boot/initrd-lvm-KernelVersion.gz
root = /dev/YourVG/YourRootLV
label = rootonlv
append = 'ramdisk_size=8192'
Replace YourVG and YourRootLV by your actual volume group and root logical volume names. You also need to change the ramdisk size to be at
least as large as that reported while lvmcreate_initrd is run. If you have enough memory, it is OK if the ramdisk size in /etc/lilo.conf
is larger than what lvmcreate_initrd reports (the memory is freed after booting). Also, your /etc/fstab in the root logical volume should
contain entries for the root LV, and the boot partition, along with any other LVs you have configured:
/dev/YourVG/YourRootLV / ext2 defaults 0 1
/dev/YourBootPartition /boot ext2 defaults 0 2
/dev/YourVG/YourUsrLV /usr ext2 defaults 0 3
/dev/YourVG/YourOptLV /opt ext2 defaults 0 4
etc.
You can use other supported filesystem types as well (e.g. reiserfs) if you have support for those in your kernel. Run lilo, reboot and
try...
The partitions containing the former /usr, /opt etc. filesystems can now be used as physical volumes. Use pvcreate(8) to turn them into
PVs and then use vgextend(8) to add them to e.g. YourVG.
DIAGNOSTICS
lvcmcreate_initrd returns 0 for success. 1 is returned in all other cases.
SEE ALSO
lilo(8), lilo.conf(5), fstab(5), lvm(8), pvcreate(8), vgextend(8), lvcreate(8), vgcreate(8)
AUTHOR
Heinz Mauelshagen <Linux-LVM@Sistina.com>
Heinz Mauelshagen LVM TOOLS LVMCREATE_INITRD(8)