I created a new LV for the first time using this command:
lvcreate -L 20G -n iew-vm-lv /dev/ubuntu-vg #create the new LV
When I try running mount /dev/ubuntu-vg/iew-vm-lv
, I get the following error:
mount: can't find /dev/ubuntu-vg/iew-vm-lv in /etc/fstab or /etc/mtab
How do I add the new LV to those files? Am I supposed to manually edit them?
The current contents of the files are:
# /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/mapper/ubuntu--vg-root--lv / ext4 errors=remount-ro 0 1
# /boot was on /dev/sda1 during installation
UUID=93d4132c-7593-4a9d-901e-30d79db3082d /boot ext2 defaults 0 2
/dev/mapper/ubuntu--vg-home--lv /home ext4 defaults 0 2
/dev/mapper/ubuntu--vg-swap--lv none swap sw 0 0
And:
/dev/mapper/ubuntu--vg-root--lv / ext4 rw,errors=remount-ro 0 0
proc /proc proc rw,noexec,nosuid,nodev 0 0
sysfs /sys sysfs rw,noexec,nosuid,nodev 0 0
none /sys/fs/cgroup tmpfs rw 0 0
none /sys/fs/fuse/connections fusectl rw 0 0
none /sys/kernel/debug debugfs rw 0 0
none /sys/kernel/security securityfs rw 0 0
udev /dev devtmpfs rw,mode=0755 0 0
devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0
tmpfs /run tmpfs rw,noexec,nosuid,size=10%,mode=0755 0 0
none /run/lock tmpfs rw,noexec,nosuid,nodev,size=5242880 0 0
none /run/shm tmpfs rw,nosuid,nodev 0 0
none /run/user tmpfs rw,noexec,nosuid,nodev,size=104857600,mode=0755 0 0
none /sys/fs/pstore pstore rw 0 0
/dev/sda1 /boot ext2 rw 0 0
systemd /sys/fs/cgroup/systemd cgroup rw,noexec,nosuid,nodev,none,name=systemd 0 0
/dev/mapper/ubuntu--vg-home--lv /home ext4 rw 0 0
Best Answer
Yes, you may edit /etc/fstab. /etc/mtab is the same format but a temporary file for what's mounted, leave it alone.
First, make a file system on it. Your system already has ext4 (there are other choices):
Then find its unique UUID identifier, the line has the name you gave the LV:
Edit /etc/fstab and add a line similar to this. Your UUID and mount point will be different.
Make this mount point directory and mount it:
Edit: a comment was concerned about LVM snapshots, which make a copy of the block device including its UUID. On the first time taking a snapshot, change its UUID:
If using XFS file system, a -U option provides similar functionality, but with a different keyword:
Either way, use the new UUID as the snapshot's mount entry.
Every time the snapshot is taken, set this snapshot UUID.
You can use several ways to refer to block devices, including for LVM /dev/vg/lv and /dev/mapper/vg-lv. I default to UUID for the same reason the RHEL Storage Administration Guide does. It finds a given file system on any block device it may reside: partitions, LVM volumes, full drives.