Linux / Gentoo Linux

Growing LVM storage

After adding some new storage to the backup system at work, I needed a way to transfer the roughly 400GB of backups to the new installation – without the use of a USB disk or another server (would take way too long). So after installing CentOS 5.3 with LVM2 enabled, I dedicated the better part of 1TB to the new backup storage on the new hard drive.

After mounting the old storage, I copied the old archives to the new LVM storage and did the following.

Prepping partition for LVM

Use fdisk to change the partition type to ‘Linux LVM’, hex code ‘8e’: fdisk /dev/sdb

Then create the structure needed for use with LVM on the new partition: pvcreate /dev/sdb1

Finally, add the new LVM partition to the LVM caches by letting the automated scan picking it up: vgscan

Now to actually append the new partition to the storage pool: vgextend VolGroup00 /dev/sdb1

Adding to LVM

If you run vgdisplay, you should now see the space you just added as free space in the LVM storage pool.

You can now add the free space to one or more storage volumes that need it: lvextend -L +353.5G /dev/VolGroup00/LogVolBackups

Finally, let the filesystem on the drive resize to fill the new space: resize2fs /dev/VolGroup00/LogVolBackups

And there we go, 353.5GiB added to the LVM2 storage. Now next time I won’t think twice to use LVM2.

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