Online Resize Logical Volume

Logical Volume dapat di-resize secara online dengan perintah sebagai berikut. Perintah tersebut sukses dilaksanakan pada saat proses read-write terjadi pada logical volume. Hanya disarankan untuk proses resize ke ukuran yang lebih besar.

$ sudo lvextend -L 50G /dev/mapper/vg1-db1

Size of logical volume vg1/db1
changed from 20.00 GiB (5120 extents) to 50.00 GiB (12800 extents).
Logical volume db1 successfully resized.

$ sudo resize2fs /dev/mapper/vg1-db1

resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/vg1-db1 is mounted on /volume/db1;
on-line resizing required
old desc_blocks = 2, new_desc_blocks = 4

Performing an on-line resize of /dev/mapper/vg1-db1 to 13107200 (4k) blocks.
The filesystem on /dev/mapper/vg1-db1 is now 13107200 blocks long.

Fix ext4 File System

Waktu itu, ketika lagi download file dari ftp dan memang sengaja download sampe penuh hard disk, muncul error:

$ ls -l
ls: cannot access FILE_NAME: Input/output error

Hard disk tersebut dikonfigurasi dengan LVM dengan file system ext4. Biasanya diperbaiki dengan Ubuntu LiveCD, namun kali ini dicoba live.

$ df -h
Filesystem           Size  Used Avail Use% Mounted on
/dev/sda1            6.4G  2.5G  3.7G  40% /
udev                 683M  4.0K  683M   1% /dev
tmpfs                139M  224K  139M   1% /run
none                 5.0M     0  5.0M   0% /run/lock
none                 692M     0  692M   0% /run/shm
/dev/mapper/vg1-lv1   20G   12G  7.8G  60% /u01

fsck butuh data lokasi file system . Dari informasi df, LVM ada di /dev/mapper/vg1-lv1 :

$ sudo fsck.ext4 /dev/mapper/vg1-lv1
e2fsck 1.42 (29-Nov-2011)
/dev/mapper/vg1-lv1 is mounted.
WARNING!!!  The filesystem is mounted.
If you continue you ***WILL*** 
cause ***SEVERE*** filesystem damage.
Do you really want to continue<n>? yes

Kalo males tekan tombol y, bisa ditambahkan opsi -y :

$ sudo fsck.ext4 -y /dev/mapper/vg1-lv1

Done.