This page shows how to attach and detach additional volumes to an existing server.
- You have an account and are logged into cloud.scaleway.com
- You have configured your SSH Key
- You have a server
Each server can have at most 15 volumes, including the root volume. The type of disk to host your volumes use the LSSD technology: Local solid state drive, to deliver fast disk I/O.
LSSD volumes are teleported close to your server.
When you start a server for the first time, your volume files are downloaded from the volumes store to the local storage devices (LSSD).
Each time you start or stop a server, the volumes are downloaded or uploaded to the volumes store. The larger the amount of data to transfer, the longer the upload or download duration.
We work constantly on optimizing the transfer time of local storage devices to the volumes store.
There are five steps to attach a volume to an existing server
- Create a new volume
- Attach the volume to your server
- Format the additional volume
- Mount additional volumes manually
- Mount additional volumes with fstab (automatic mount)
Important: Server must be powered off to attach or detach a volume.
In the Control Panel, click “Volumes” in the compute section.
Click the “Create Volume” button. You will land on the volume-creation page where you must input basic information for your volume:
- The name of your volume
- The volume type - LSSD (Local solid state drive)
- The size in Go
In the servers page, click on the server you want to attach a volume to.
On the server detail page click “Attach an existing volume” and select the volume to attach in the list.
Important: To detach the volume, click the Detach button.
If the new volume has never been formatted, you need to format the volume using
mkfs before you can mount it.
For instance, the following command creates an
ext4 file system on the volume:
root@c1-X-Y-Z-T:~# mkfs -t ext4 /dev/nbd1 mke2fs 1.42.9 (4-Feb-2014) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 610800 inodes, 2441406 blocks 122070 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=2503999488 75 block groups 32768 blocks per group, 32768 fragments per group 8144 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632 Allocating group tables: done Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done
To mount the device manually as /mnt/data, run the following commands:
root@c1-X-Y-Z-T:~# mkdir -p /mnt/data root@c1-X-Y-Z-T:~# mount /dev/nbd1 /mnt/data root@c1-X-Y-Z-T:~# ls -la /mnt/data/ total 24 drwxr-xr-x 3 root root 4096 Jan 1 00:07 . drwxr-xr-x 3 root root 4096 Jan 1 00:07 .. drwx------ 2 root root 16384 Jan 1 00:07 lost+found
To mount the additional volume automatically, you have to reference your devices in the
/etc/fstab references all devices to mount when they are connected.
For instance to mount
/dev/nbd1 device automatically to the
/mnt/data directory, the
/etc/fstab has the following content:
# /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> /dev/nbd1 /mnt/data auto defaults,nobootwait,errors=remount-ro 0 2
The configuration above mounts the /dev/nbd1 device to the
/mnt/data directory with fstab default option and
nobootwait (available on Ubuntu only).
nobootwait is set to prevent boot problems in the case your volume is not yet downloaded to the local storage.
Create the /mnt/data directory if it doesn’t exist.
root@c1-X-Y-Z-T:~# mkdir -p /mnt/data
To check devices are mounted properly, run the
mount -a command to mount all devices.
Important: On the next server boot, your volumes will be mounted automatically.
Now run the
df -h command, this command will list all your devices and where they are mounted:
root@c1-X-Y-Z-T:~# df -h Filesystem Size Used Avail Use% Mounted on /dev/nbd0 23G 420M 22G 2% / none 1010M 36K 1010M 1% /dev none 203M 80K 203M 1% /run none 5.0M 0 5.0M 0% /run/lock none 1012M 0 1012M 0% /run/shm none 100M 0 100M 0% /run/user /dev/nbd1 9.2G 149M 8.6G 2% /mnt/data
Try this tutorial on your own C1 server TRY IT
This is a companion discussion topic for the original entry at https://www.scaleway.com/docs/attach-and-detach-a-volume-to-an-existing-server/