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Creating /boot partition for LVM VG


 
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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.

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