Create volume using LVM over 2 physical disks Post: 302729329

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Operating Systems Linux Red Hat Create volume using LVM over 2 physical disks Post 302729329 by ikn3 on Friday 9th of November 2012 12:27:01 PM

11-09-2012

Registered User

The issue was on RHEL 5.5 which is on VMWare

Quote:

Originally Posted by Scott

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.

ikn3

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vgreduce

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

NAME

       vgreduce - reduce a volume group

SYNOPSIS

       vgreduce  [-a|--all] [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [--removemissing] [-t|--test] [-v|--verbose] VolumeGroupName [Physi-
       calVolumePath...]

DESCRIPTION

       vgreduce allows you to remove one or more unused physical volumes from a volume group.

OPTIONS

       See lvm for common options.

       -a, --all
	      Removes all empty physical volumes if none are given on command line.

       --removemissing
	      Removes all missing physical volumes from the volume group, if there are no logical volumes allocated on those. This resumes  normal
	      operation of the volume group (new logical volumes may again be created, changed and so on).

	      If this is not possible (there are logical volumes referencing the missing physical volumes) and you cannot or do not want to remove
	      them manually, you can run this option with --force to have vgreduce remove any partial LVs.

	      Any logical volumes and dependent snapshots that were partly on the missing disks get removed completely. This includes those  parts
	      that lie on disks that are still present.

	      If your logical volumes spanned several disks including the ones that are lost, you might want to try to salvage data first by acti-
	      vating your logical volumes with --partial as described in lvm (8).

SEE ALSO

       lvm(8), vgextend(8)

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

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