# Quick Guide: Expanding Disks ==================================================================================== ### Virtual Disk Expansion
1. Scan for disk hardware changes:
``` for i in /sys/class/scsi_host/host*/scan; do echo "- - -" > $i; done for i in /sys/class/scsi_device/*/device/rescan; do echo "1" > $i; done ``` 2\. Check for updated disk size: ``` lsblk ``` Your output will look something like this: ``` NAME            MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT sda               8:0    0   120G  0 disk ├─sda1            8:1    0   512M  0 part /boot └─sda2            8:2    0 103.5G  0 part   ├─eCloud-root 253:0    0 102.5G  0 lvm  /   └─eCloud-swap 253:1    0     1G  0 lvm  [SWAP] sdc               8:32   0   200G  0 disk └─sdc1            8:33   0   200G  0 part sr0              11:0    1  1024M  0 rom ``` 3. Check partitions using fdisk ``` fdisk -l ``` Output will look something like this: ``` [root@server ~]# fdisk -l Disk /dev/sda: 128.8 GB, 128849018880 bytes, 251658240 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: 0x000b9cfe    Device Boot      Start         End      Blocks   Id  System /dev/sda1   *        2048     1050623      524288   83  Linux /dev/sda2         1050624   218103774   108526575+  8e  Linux LVM ``` 4. Run growpart against the expanded device: ``` growpart /dev/sda 2 ``` 5. Run pvresize command against the partition: ``` pvresize /dev/sda2 ``` 6\. Resize the logical volume, ensure to replace vg and lv with the appropriate values (these will typically be the same as seen on df -h): ``` lvresize -rl +100%FREE /dev/mapper/vg/lv ``` 7\. Check that the space has been applied to the filesystem: ``` df -h ``` ==================================================================================== ### Physical Disk Expansion (Additional Disk)
1. Scan for disk hardware changes:
``` for i in /sys/class/scsi_host/host*/scan; do echo "- - -" > $i; done for i in /sys/class/scsi_device/*/device/rescan; do echo "1" > $i; done ``` 2\. Check for updated disk size: ``` lsblk ``` Your output will look something like this: ``` NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 111.3G 0 disk ├─sda1 8:1 0 1G 0 part /boot └─sda2 8:2 0 110.3G 0 part ├─vg_main-lv_root 253:0 0 105G 0 lvm / └─vg_main-lv_swap 253:1 0 4G 0 lvm [SWAP] sdb 8:16 0 111.8G 0 disk /mnt sdc 8:32 0 237.9G 0 disk ``` In this example, the additional disk is /dev/sdc. 3\. Create a new partition on the additional disk: ``` fdisk /dev/sdc ``` Once you've run the above command, you'll be entered into the fdisk prompt, the below options are typically suitable: p - print n - make new partition p - primary w - write 4\. Check the physical volume and create a new physical volume on the new partition: ``` [root@test ~]# pvs   PV         VG      Fmt  Attr PSize    PFree /dev/sda2  vg_main lvm2 a--  <110.25g <1.25g ``` Create a new physical volume on the new partition: ``` pvcreate /dev/sdc1 ``` Show new Physical Volume ``` [root@test ~]# pvs PV         VG      Fmt  Attr PSize    PFree /dev/sda2  vg_main lvm2 a--  <110.25g  <1.25g   /dev/sdc1          lvm2 ---   237.87g 237.87g ``` 6: Extend the volume group “vg\_main” over the new partition ``` vgextend vg_main /dev/sdc1 ``` Show volume group ``` [root@test ~]# vgs VG      #PV #LV #SN Attr   VSize    VFree vg_main   2   2   0 wz--n- <348.12g <239.12g ``` 7\. Resize the logical volume, ensure to replace vg and lv with the appropriate values (these will typically be the same as seen on df -h): ``` lvresize -rl +100%FREE /dev/mapper/vg/lv ``` 8\. Check that the space has been applied to the filesystem: ``` df -h ```