- 缘起同事在调整VolGroup-lv_root与VolGroup-lv_home分区大小之时，系统还未执行完直接重启了，导致报错如下
- parted -l查看后发现，/dev/mapper/VolGroup-lv_home的Partition Table类型为msdos，需修改为loop
- 解决方法
1) To know all the disks attached to VPS/Server type
# parted --list
It will show you all the disk along with the unpartitioned disk. Let, we attached a new disk "/dev/xvdb" to server. It will show "unrecognised disk label" message on "parted --list".
----
root@server [~] parted /dev/xvdb
GNU Parted 1.8.1
Using /dev/xvdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print free
Error: Unable to open /dev/xvdb - unrecognised disk label.
----
2) Execute the following command to edit disk "/dev/xvdb":
# parted /dev/xvdb
3) Type "mklabel msdos"
It creates a new disk label of type "msdos". The new disk label will have no partitions. This command won't technically destroy your data, but it will make it will make it basically unusable.
----
(parted) mklabel msdos
----
4) Type "print free" to know the partition details.
----
(parted) print free
Model: Xen Virtual Block Device (xvd)
Disk /dev/xvdb: 53.7GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
0.00kB 53.7GB 53.7GB Free Space
(parted)
----
5) Type "mkpart primary 0.00kB 53.7GB" (let the total size is 53.7GB)
----
(parted) mkpart primary 0.00kB 53.7GB
----
6) Again type "print free" to know the partition details.
----
(parted) print free
Model: Xen Virtual Block Device (xvd)
Disk /dev/xvdb: 53.7GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 0.51kB 53.7GB 53.7GB primary
(parted)
----
7) type "quit" to exit the parted utility.
----
(parted) quit
Information: Don't forget to update /etc/fstab, if necessary.
root@server [~]#
----
8) Execute the following command:
# parted --list
This time it will show the new disk too. Now we have to set the file system type on the disk and mount it.
==========
root@server [~]# parted --list
Error: Unable to open /dev/md0 - unrecognised disk label.
Model: Unknown (unknown)
Disk /dev/sda2: 1074MB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Number Start End Size File system Flags
1 0.00kB 1074MB 1074MB linux-sw ap
Model: Unknown (unknown)
Disk /dev/sda1: 73.4GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Number Start End Size File system Flags
1 0.00kB 73.4GB 73.4GB ext3
Model: Unknown (unknown)
Disk /dev/xvdb: 53.6GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size File system Flags
1 0.00kB 53.6GB 53.6GB ext3
==========
8) Since the partition is not formated so we cannot mount it without formatting. To format the new disk use "mkfs.ext3 /dev/xvdb1". It may take some time to process.
====================
root@server [~]# mkfs.ext4 /dev/xvdb
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
6553600 inodes, 13107199 blocks
655359 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem b locks=4294967296
400 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information:
done
This filesystem will be automatically checked every 38 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
====================
9) Take a backup of file "/etc/fstab" and then open it using "vi" editor and mount it
------
root@server [~]# cp -pv /etc/fstab /etc/fstab2
`/etc/fstab' -> `/etc/fstab2'
------
We will add the following line in "/etc/fstab". Here we are mounting the partition at "/backup" directory.
------
/dev/xvdb1 /backup ext4 defaults 0 0
------
10) Use the following command to mount it.
------
root@server [~]# mount /backup
------
Thank you.原文连接
How to partition a disk, set its file system type & mount it