Adding storage to RHELAH non-desctructively

add-rhelah-storage-non-destructive

1.  Create new file based disk.  This creates a 10G sparsely allocated disk.

$ sudo dd if=/dev/zero of=/var/lib/libvirt/images/rhelah_7.1.2_extra.img bs=1M seek=10240 count=0

2.  Create a KVM disk config

$ cat rhelah_7.1.2_extra.xml
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/var/lib/libvirt/images/rhelah_7.1.2_extra.img'/>
<target dev='vdb'/>
</disk>

3.  Attach the disk to the VM

$ sudo virsh attach-device --config rhel-atomic-7.1.2 rhelah_7.1.2_extra.xml

4.  Verify the disk is attached.  Inspect the XML for the new disk section.

$ sudo virsh dumpxml rhel-atomic-7.1.2

5.  Start your VM

$ sudo virsh start rhel-atomic-7.1.2

6.  Login to the VM and stop 'docker' and 'docker-storage-setup'

# systemctl stop docker docker-storage-setup

7. Create new PV from disk

# pvcreate /dev/vdb
  Physical volume "/dev/vdb" successfully created

8.  Extend the 'atomicos' VG
# vgextend atomicos /dev/vdb
  Volume group "atomicos" successfully extended

9.  Extend the 'root' LV

# lvextend -L +3GB /dev/atomicos/root
   Size of logical volume atomicos/root changed from 2.94 GiB (94 extents) to 5.94 GiB (190 extents).
   Logical volume root successfully resized

10.  Grow the XFS filesystem

# xfs_growfs /
meta-data=/dev/mapper/atomicos-root isize=256    agcount=4, agsize=192512 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=770048, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 770048 to 1556480

11.  Start 'docker' and 'docker-storage-setup'

# systemctl start docker docker-storage-setup

12.  Inspect 'docker-storage-setup' logs for results

# journalctl -u docker-storage-setup
...
Jun 04 15:32:46 rhel-atomic-test-0.localdomain docker-storage-setup[5604]: Physical volume "/dev/vdb" changed
Jun 04 15:32:46 rhel-atomic-test-0.localdomain docker-storage-setup[5604]: 1 physical volume(s) resized / 0 physical volume(s) not resized
Jun 04 15:32:46 rhel-atomic-test-0.localdomain docker-storage-setup[5604]: Size of logical volume atomicos/docker-pool_tdata changed from 6.69 GiB (214 extents) to 13.53 GiB (433 extents).
Jun 04 15:32:46 rhel-atomic-test-0.localdomain docker-storage-setup[5604]: Logical volume docker-pool successfully resized