adding free space to LVM

penchosky

I replaced 146GB drives with 300GB drives in a HP server and extended the Raid 5 partition using HP smart array manager. I now have a 900GB HP Raid array logical volume and want to use the free space in CentOS 7 with LVM.

I want to allocate the free space to my home filesystem. What is the best way to accomplish this? I thought about trying to use fdisk to change the ending sector for partition 2 to have it end at 900 instead of 450. I know I could create a new partition with the free space and add it to the LVM group. Then add that to the filesystem. I'm not sure what is the best approach so thought I would ask the group. Thanks!

 

This is the output of parted and fdisk.

[root@jpvmserver ~]# parted

GNU Parted 3.1

Using /dev/sda

Welcome to GNU Parted! Type 'help' to view a list of commands.

(parted) print devices                                                   

/dev/sda (900GB)

/dev/mapper/centos_jpvmserver-home (367GB)

/dev/mapper/centos_jpvmserver-swap (34.4GB)

/dev/mapper/centos_jpvmserver-root (26.8GB)

(parted) print free

Model: HP LOGICAL VOLUME (scsi)

Disk /dev/sda: 900GB

Sector size (logical/physical): 512B/512B

Partition Table: msdos

Disk Flags:

Number  Start   End     Size    Type     File system  Flags

        32.3kB  1049kB  1016kB           Free Space

 1      1049kB  2149MB  2147MB  primary  ext3         boot

 2      2149MB  430GB   428GB   primary               lvm

        430GB   900GB   470GB            Free Space

(parted) q                                                               

[root@jpvmserver ~]# fdisk -l

Disk /dev/sda: 899.9 GB, 899898718208 bytes, 1757614684 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x00050878

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *        2048     4196351     2097152   83  Linux

/dev/sda2         4196352   840550399   418177024   8e  Linux LVM

Disk /dev/mapper/centos_jpvmserver-root: 26.8 GB, 26843545600 bytes, 52428800 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/mapper/centos_jpvmserver-swap: 34.4 GB, 34359738368 bytes, 67108864 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/mapper/centos_jpvmserver-home: 367.0 GB, 367001600000 bytes, 716800000 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Renich

Check this one out: http://forums.fedoraforum.org/showthread.php?t=269774

Please, make sure you have backups before that. There is a way of backing up the partition table with gdisk. Look into it so you can restore it if anything goes wrong.

mikent

You need to use LVM to add this new disk to your volume group and then you can extend your logical volume.