Creating /boot partition for LVM VG


 
Thread Tools Search this Thread
Operating Systems Linux Creating /boot partition for LVM VG
# 1  
Old 09-14-2013
Creating /boot partition for LVM VG

Hi,
I have a server booted into sysresccd (mini-linux OS) with 1 40 GB disk attached
I am trying to create a volume group and restore another server into the new one

However, when I try to create a partition for /boot it seems that my VG in LVM is not recognized anymore

These are the configuration of the server I am trying to restore

Code:
[root@galtest ~]# fdisk -l /dev/sda

Disk /dev/sda: 64.4 GB, 64424509440 bytes
64 heads, 32 sectors/track, 61440 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1         100      102384   83  Linux
/dev/sda2             101       61440    62812160   8e  Linux LVM

[root@galtest ~]# lvmdiskscan |grep sda
  /dev/sda1            [       99.98 MB]
  /dev/sda2            [       59.90 GB] LVM physical volume
[root@galtest ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree
  vg00     1   8   0 wz--n- 59.88G 18.72G

[root@galtest ~]# df -h /dev/sda1
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1              97M   35M   58M  38% /boot

[root@galtest ~]# df -h /dev/sda2
Filesystem            Size  Used Avail Use% Mounted on
-                     2.8G   72K  2.8G   1% /dev



On my new server I am creating a new VG using /dev/sda and then 2 partitions (same as the above) however when I create the partitions the VG is not visible anymore
see below for more information


Code:
root@sysresccd /etc/lvm % fdisk -l /dev/sda

Disk /dev/sda: 42.9 GB, 42949672960 bytes
64 heads, 32 sectors/track, 40960 cylinders, total 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xeac5c5ef

   Device Boot      Start         End      Blocks   Id  System



root@sysresccd /etc/lvm % vgcreate vg00 /dev/sda
  No physical volume label read from /dev/sda
  Physical volume "/dev/sda" successfully created
  Volume group "vg00" successfully created

root@sysresccd /etc/lvm % vgs
  VG   #PV #LV #SN Attr   VSize  VFree
  vg00   1   0   0 wz--n- 40.00g 40.00g

root@sysresccd /etc/lvm % pvs
  PV         VG   Fmt  Attr PSize  PFree
  /dev/sda   vg00 lvm2 a--  40.00g 40.00g

root@sysresccd /etc/lvm % fdisk /dev/sda
Welcome to fdisk (util-linux 2.21.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xa701bbb6.

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p
Partition number (1-4, default 1):
Using default value 1
First sector (2048-83886079, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-83886079, default 83886079): +100M
Partition 1 of type Linux and of size 100 MiB is set

Command (m for help): n
Partition type:
   p   primary (1 primary, 0 extended, 3 free)
   e   extended
Select (default p): p
Partition number (1-4, default 2):
Using default value 2
First sector (206848-83886079, default 206848):
Using default value 206848
Last sector, +sectors or +size{K,M,G} (206848-83886079, default 83886079):
Using default value 83886079
Partition 2 of type Linux and of size 39.9 GiB is set

Command (m for help): t
Partition number (1-4): 2
Hex code (type L to list codes): 8e
Changed system type of partition 2 to 8e (Linux LVM)

Command (m for help): a
Partition number (1-4): 1

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.


root@sysresccd /etc/lvm % fdisk -l /dev/sda

Disk /dev/sda: 42.9 GB, 42949672960 bytes
64 heads, 32 sectors/track, 40960 cylinders, total 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xa701bbb6

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      206847      102400   83  Linux
/dev/sda2          206848    83886079    41839616   8e  Linux LVM



root@sysresccd /etc/lvm % vgs
  No volume groups found


Can anyone point what am I missing?

Thanks in advance any attempt to assist !

Gal
# 2  
Old 09-14-2013
I don't find it all too surprising that a volume group on a disk you just partitioned with fdisk has disappeared. It kinda makes sense to partition the disk before creating volume groups and the like. If you remove the partitions again with fdisk, your volume group should re-appear.

The subject of your thread (Creating /boot partition for LVM VG) is a tad confusing. I trust you were not trying to create an LVM volume for the /boot partition? That's not a great idea because GRUB can't read those.
# 3  
Old 09-15-2013
You have to first create the LVM partitions using fdisk/gdisk/parted/gparted etc., then use pvcreate to create the physical volumes, before you can create a new volume group or add a physical volume to an existing volume group.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Red Hat

Converting Standart partition to LVM

is possible to convert standard partition ext4 to LVM with preserving data? is yes then how? OS is Linux 5 / 6 (1 Reply)
Discussion started by: manoj.solaris
1 Replies

2. Red Hat

LVM based partition

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

3. Red Hat

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... (5 Replies)
Discussion started by: gr8_usk
5 Replies

4. Red Hat

Linux partition with LVM

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

5. Red Hat

Removing encrypted lvm partition

Hi guys, let me start by saying I appreciate your assistance always. I was practicing how to encrypt partitions in my server. I encrypted an lvm partition using luks and when I tried to remove the partition using lvremove, I get this message Logical volume vg10/lvol1 is used by another... (2 Replies)
Discussion started by: cjashu
2 Replies

6. Solaris

Partition overlaps another partition while creating new parition in solaris

hi all while formatting hard disk i am getting following error. Partition 1 ends at 266338338 It must be between 34 and 143374704. label error: EFI Labels do not support overlapping partitions Partition 8 overlaps partition 1. Warning: error writing EFI. Label failed. I have formatted the... (2 Replies)
Discussion started by: nikhil kasar
2 Replies

7. UNIX for Dummies Questions & Answers

How to convert non LVM root partition to LVM?

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

8. Red Hat

Increase root partition in LVM

I have a RHEL6 guest running on vmware esx server and the root disk size is 30G and i increased the disk size and create another partition /dev/sda3 but i do not know how to increase the size of the VG and then intrun LV .. can anyone help me on this . fdisk -l /dev/sda Disk /dev/sda:... (1 Reply)
Discussion started by: fugitive
1 Replies

9. Red Hat

add lvm space from a regular partition

Hi, I have red hat enterprise 4. I would like to add more space on my lvm from the first partition that is not lvm type. Here's the config # fdisk -l Disk /dev/sda: 73.4 GB, 73406611456 bytes 255 heads, 63 sectors/track, 8924 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes... (6 Replies)
Discussion started by: itik
6 Replies

10. Filesystems, Disks and Memory

Creating /boot partition & MBR concerns

I have 40GB HD with mepis8, swap, MBR and under flags word boot. I also have a 160 GB external with a few Linux OS, no swaps, no extended etc. I am total Linux no MS I would feel more secure by resizing that sda1 partition and creating a /boot partition with the MBR housed there. Is that a... (1 Reply)
Discussion started by: worthamtx
1 Replies
Login or Register to Ask a Question