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Operating Systems Linux Red Hat Create volume using LVM over 2 physical disks Post 302728263 by Scott on Wednesday 7th of November 2012 02:15:02 PM
Old 11-07-2012
Ah, OK. Think I've got it.

Code:
[root@RH631d ~]# fdisk /dev/sdd
--- created primary partition 1 --- now /dev/sdd1
--- created primary partition 2 --- now /dev/sdd2

[root@RH631d ~]# pvcreate /dev/sdd1
  Physical volume "/dev/sdd1" successfully created
[root@RH631d ~]# pvcreate /dev/sdd2
  Physical volume "/dev/sdd2" successfully created
[root@RH631d ~]# lvmdiskscan
  /dev/ramdisk       [       16.00 MB] 
  /dev/myvg01/mylv01 [       10.00 GB] 
  /dev/ram           [       16.00 MB] 
  /dev/sda1          [       47.03 MB] 
  /dev/myvg01/mylv02 [       10.00 GB] 
  /dev/ram2          [       16.00 MB] 
  /dev/root          [        3.90 GB] 
  /dev/ram3          [       16.00 MB] 
  /dev/sda3          [        1.97 GB] 
  /dev/ram4          [       16.00 MB] 
  /dev/ram5          [       16.00 MB] 
  /dev/sda5          [       14.08 GB] 
  /dev/ram6          [       16.00 MB] 
  /dev/ram7          [       16.00 MB] 
  /dev/ram8          [       16.00 MB] 
  /dev/ram9          [       16.00 MB] 
  /dev/ram10         [       16.00 MB] 
  /dev/ram11         [       16.00 MB] 
  /dev/ram12         [       16.00 MB] 
  /dev/ram13         [       16.00 MB] 
  /dev/ram14         [       16.00 MB] 
  /dev/ram15         [       16.00 MB] 
  /dev/sdb           [       50.00 GB] LVM physical volume
  /dev/sdc           [       50.00 GB] LVM physical volume
  /dev/sdd1          [        2.30 GB] LVM physical volume
  /dev/sdd2          [        1.53 GB] LVM physical volume
  3 disks
  19 partitions
  2 LVM physical volume whole disks
  2 LVM physical volumes
[root@RH631d ~]# vgcreate myvg02 /dev/sdd1 /dev/sdd2
  Volume group "myvg02" successfully created

That's not really what you asked, but it was useful for me Smilie

It looks to me like your sdb1 is using up the whole disk. That doesn't help you if you want sdb1 to be 110GB and sdb2 60GB. If sdb1 is using all the space, you can't create an sdb2 on that disk.

You never said what pvs showed. And while you're there, what does lvmdiskscan show? It's only for information, nothing else.

I would suggest, if you know that sdb1 is not being used, you remove it and repartition the disk with the sizes you want.

Over that, I would recommend this:
  • Remove "sdb1" using "fdisk" - actually I would remove the PV and rescan
  • Create a volume group called "oraclevg", or whatever it's for, using both sdb, and another for sdc - i.e. let LVM handle it.
  • Create logical volumes for u02 as 60 GB as whatever is left (100%FREE) from sdb
  • Create another logical volume using sdc for u03
 

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

NAME
       vgextend - add physical volumes to a volume group

SYNOPSIS
       vgextend  [-A|--autobackup  y|n]  [-d|--debug]  [-h|-?|--help] [--restoremissing] [-f|--force] [-t|--test] [-v|--verbose] [ PHYSICAL DEVICE
       OPTIONS ] VolumeGroupName PhysicalDevicePath [PhysicalDevicePath...]

DESCRIPTION
       vgextend allows you to add one or more initialized physical volumes ( see pvcreate(8) ) to an existing volume group to extend it  in  size.
       Moreover,  it  allows  you to re-add a physical volume that has gone missing previously, due to a transient device failure, without re-ini-
       tialising it. Use vgextend --restoremissing to that effect.

       If PhysicalDevicePath was not previously configured for LVM with pvcreate (8), the device will be initialized with the same default  values
       used  with  pvcreate.  If non-default pvcreate values are are desired, they may be given on the commandline with the same options as pvcre-
       ate.  See PHYSICAL DEVICE OPTIONS for available options.  Note that the restore-related options such as --restorefile, --uuid, and --physi-
       calvolumesize are not available.  If a restore operation is needed, use pvcreate (8) and vgcfgrestore (8).

OPTIONS
       See lvm for common options.

PHYSICAL DEVICE OPTIONS
       The  following  options	are  available	for initializing physical devices in the volume group.	These options are further described in the
       pvcreate man page.

       -f, --force

       -y, --yes

       -Z, --zero y|n

       --labelsector sector

       --metadatasize size

       [--metadataignorey|n]

       --pvmetadatacopies copies

       --dataalignment alignment

       --dataalignmentoffset alignment_offset

Examples
       "vgextend vg00 /dev/sda4 /dev/sdn1" tries to extend the existing volume group "vg00"  by  the  new  physical  volumes  (see  pvcreate(8)  )
       "/dev/sdn1" and /dev/sda4".

SEE ALSO
       lvm(8), vgcreate(8), vgreduce(8), pvcreate(8)

Sistina Software UK					 LVM TOOLS 2.02.95(2) (2012-03-06)					       VGEXTEND(8)
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