Resize Storage on the fly – without rebooting your server
gridscale allows you to resize your storage without rebooting your server, but the new Capacity is not immediately available for your system
Firstly you have to resize the partition and the filesystem of your storage. Both are easy to do with a few simple steps.
In this example a Server with Debian 8 and a single Storage is used.
At first the initial state with 10 GB of Storage:
root@resizeme:~# parted /dev/sda print
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 10.7GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 10.7GB 10.7GB ext4 rootfs
root@resizeme:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 10M 0 10M 0% /dev
tmpfs 400M 5.3M 395M 2% /run
/dev/sda1 9.9G 798M 8.8G 9% /
tmpfs 999M 0 999M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 999M 0 999M 0% /sys/fs/cgroup
In this example the partition you need to resize is /dev/sda1. If you use another template, it can be /dev/sda2 too. You can recognize it by taking a look at the Mount-Point in the last column of the table. For comparison, here is the output of a system on which the partition /dev/sda2/ would be enlarged.
root@resizeme:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 10M 0 10M 0% /dev
tmpfs 387M 388K 386M 1% /run
/dev/sda2 9.8G 2.3G 7.0G 25% /
tmpfs 966M 0 966M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 966M 0 966M 0% /sys/fs/cgroup
Now you can resize the Storage via API or via GUI. As soon as you save the change, you should see something like this in your system logs:
root@resizeme:~# journalctl -f
[...]
Mar 18 16:18:30 resizeme kernel: sd 0:0:0:0: Capacity data has changed
Mar 18 16:18:30 resizeme kernel: sd 0:0:0:0: [sda] 41943040 512-byte logical blocks: (21.4 GB/20.0 GiB)
Mar 18 16:18:30 resizeme kernel: sda: detected capacity change from 10737418240 to 21474836480
Now change the system’s partition while the server is still running:
root@resizeme:~# parted /dev/sda
Fix/Ignore? Fix
(parted) resizepart 1
Yes/No? Yes
End? [10.7GB]? 100%
(parted) print
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 21.5GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 21.5GB 21.5GB ext4 rootfs
The last step is to resize the filesystem:
root@resizeme:~# resize2fs /dev/sda1
With the following command you can see that the new size is now available:
root@resizeme:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 10M 0 10M 0% /dev
tmpfs 400M 5.3M 395M 2% /run
/dev/sda1 20G 798M 19G 5% /
tmpfs 999M 0 999M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 999M 0 999M 0% /sys/fs/cgroup
