linux - fdisk-l has a large space, df -h has a small space-PHP Chinese Network Q&A

My system is Ubuntu 14.04 LTS

Enter the commanddf -h, the display will be as follows:

Filesystem Size Used Avail Use% Mounted on /dev/mapper/ubuntu--vg-root 19G 18G 0 100% / none 4.0K 0 4.0K 0% /sys/fs/cgroup udev 3.9G 12K 3.9G 1% /dev tmpfs 799M 2.0M 797M 1% /run none 5.0M 0 5.0M 0% /run/lock none 3.9G 4.9M 3.9G 1% /run/shm none 100M 0 100M 0% /run/user /dev/vda1 236M 37M 188M 17% /boot

The total space is only more than 20 G, which is no longer enough.

And enterfdisk -l, the display will be as follows:

Disk /dev/vda: 322.1 GB, 322122547200 bytes 16 heads, 63 sectors/track, 624152 cylinders, total 629145600 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 identifier: 0x0009d617 Device Boot Start End Blocks Id System /dev/vda1 * 2048 499711 248832 83 Linux /dev/vda2 501758 41940991 20719617 5 Extended /dev/vda5 503806 41940991 20718593 8e Linux LVM Disk /dev/mapper/ubuntu--vg-root: 20.1 GB, 20124270592 bytes 255 heads, 63 sectors/track, 2446 cylinders, total 39305216 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 identifier: 0x00000000 Disk /dev/mapper/ubuntu--vg-root doesn't contain a valid partition table Disk /dev/mapper/ubuntu--vg-swap_1: 1069 MB, 1069547520 bytes 255 heads, 63 sectors/track, 130 cylinders, total 2088960 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 identifier: 0x00000000 Disk /dev/mapper/ubuntu--vg-swap_1 doesn't contain a valid partition table

Could you please explain it and tell me how to expand the space to the 300G size displayed by fdisk?

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给我你的怀抱2017-06-17 09:17:44 3 floor

Your machine has two hard drives, one is /dev/mapper/ubuntu--vg-root, and the size is 20.1 GB. This is your system disk, and the usage rate has now reached 100%.
The other disk is /dev/vda, which is 322.1 GB in size and is currently unmounted.

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習慣沉默2017-06-17 09:17:44 2 floor

Ni’s /dev/vda is not mounted

世界只因有你2017-06-17 09:17:44 1 floor

Current situation: You have a 300G hard disk with two partitions, one is the main partition /dev/vda1, more than 200M, mounted to /boot, an extended partition /dev/vda2, which has a logical partition /dev /vda5, occupies 20G of space. LVM was created on /dev/vda5. LVM allocated 19G of it to /dev/mapper/ubuntu--vg-root and mounted it to the root directory, while the other 1G was allocated to / dev/mapper/ubuntu--vg-swap_1 swap partition.

Problem: Only 20G of the 300G space is used, and the other 280G is not used.

Solution: Use fdisk to create a new partition on the remaining space, then add the newly created partition to LVM, and finally expand the size of /dev/mapper/ubuntu--vg-root. I don’t know the specific command. Familiar, the general idea should be like this.