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how to add add new disk to lvm group

how to add add new disk to lvm group

Use the lsblk command to view your available disk devices and their mount points. The output of lsblk removes the /dev/ prefix from full device paths. Here xvda  is root device and -xvda1  is partitions.   indicate the mount point.  On the other hand xvdf no partition and mount point. 


[ec2-user ~]$ lsblk
xvda    202:0    0    8G  0 disk
-xvda1  202:1    0    8G  0 part /
xvdf    202:80   0   10G  0 disk


Lets say we want to add disk xvdf , So first we need to determine our file system. New volumes are raw block devices, and we must create a file system to use them. We can determine file system by following command - 

[ec2-user ~]$ sudo file -s /dev/xvdf
/dev/xvdf: data

If the output shows simply data, then there is no file system on the device

[ec2-user ~]$ sudo file -s /dev/xvda1
/dev/xvda1: SGI XFS filesystem data (blksz 4096, inosz 512, v2 dirs)

output shows a root device with the XFS file system.

Also we can use lsblk -f to get file information. We can get  information about all of the attached devices to the instance.

[ec2-user ~]$ sudo lsblk -f


Display all available LVM block 

sudo lvmdiskscan
  /dev/sda   [     200.00 GiB] 
  /dev/sdb   [     100.00 GiB] 
  2 disks
  2 partitions
  0 LVM physical volume whole disks
  0 LVM physical volumes

It'll return all information. Now if you want to know specific disk which is using lvm you can use - 

lvmdiskscan -l
  WARNING: only considering LVM devices
  /dev/vda3                 [     <99.00 GiB] LVM physical volume
  0 LVM physical volume whole disks
  1 LVM physical volume

The pvscan command searches all available devices for LVM physical volumes - 

sudo pvscan
  PV /dev/sda   VG LVMVolGroup     lvm2 [200.00 GiB / 0    free]
  PV /dev/sdb   VG LVMVolGroup     lvm2 [100.00 GiB / 10.00 GiB free]
  Total: 2 [299.99 GiB] / in use: 2 [299.99 GiB] / in no VG: 0 [0   ]

pvs and pvdisplay can find more additional information - 

if we also want to discover logical extents that have been mapped to each volume we can use -m option to the pvdisplay command.

sudo pvdisplay -m

To discover available volume group we can use - 

  Reading all physical volumes.  This may take a while...
  Found volume group "LVMVolGroup" using metadata type lvm2

here LVMVolGroup is the volume group where we can add more space and manage logical volume group.



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