Create volume using LVM over 2 physical disks Post: 302729309

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Operating Systems Linux Red Hat Create volume using LVM over 2 physical disks Post 302729309 by Scott on Friday 9th of November 2012 12:13:36 PM

11-09-2012

Administrator Emeritus

So, I just added a new disk to my VM (BTW, you didn't say if you have a physical server or a virtual one):

Code:

[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
  /dev/sdd3          [      784.42 MB] LVM physical volume
  /dev/sde           [       20.00 GB] 
  4 disks
  19 partitions
  2 LVM physical volume whole disks
  3 LVM physical volumes

[root@RH631d ~]# pvcreate /dev/sde
  Physical volume "/dev/sde" successfully created

[root@RH631d ~]# vgcreate VolumeGroup00 /dev/sde
  Volume group "VolumeGroup00" successfully created

[root@RH631d ~]# lvcreate -L5G -n LogicalVolume01 VolumeGroup00
  Logical volume "LogicalVolume01" created

[root@RH631d ~]# lvcreate -L7G -n LogicalVolume02 VolumeGroup00
  Logical volume "LogicalVolume02" created

[root@RH631d ~]# lvcreate -l100%FREE -n LogicalVolume03 VolumeGroup00
  Logical volume "LogicalVolume03" created

[root@RH631d ~]# lvs
  LV              VG            Attr   LSize  Origin Snap%  Move Log Copy%  Convert
  LogicalVolume01 VolumeGroup00 -wi-a-  5.00G                                      
  LogicalVolume02 VolumeGroup00 -wi-a-  7.00G                                      
  LogicalVolume03 VolumeGroup00 -wi-a-  8.00G

No need to fdisk. No need for fancy partitioning. I can now create my filesystems using these three LV's and I don't have to worry about it.

If, later on, I want to extend these filesystems, I can add a new disk, extend the VG, extend the LV, then easily extend the FS. It's hard to do that if you have partitioned everything, absolutely, with fdisk (although I suppose you could still extend the VGs with new disks, despite the strange fdisk partitioning).

Scott

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LEARN ABOUT BSD

vgextend

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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