Extended partitions in Linux format

Extended partitions in Linux format

If you encounter the following error when formatting a disk in Linux, it indicates that you are formatting an extended partition.

[root@GETTestLNX06 ~]# mkfs.ext4 /dev/sdb1

mke2fs 1.41.12 (17-May-2010)

mkfs.ext4: inode_size (128) * inodes_count (0) too big for a

filesystem with 0 blocks, specify higher inode_ratio (-i)

or lower inode count (-N).

You cannot directly format extended partitions. You can only format primary partitions and logical partitions. Then how should we format an extended partition? We can either delete the extended partition, create a primary partition, or create a logical partition on the extended partition, as shown in the following operations:

1: Create a logical Partition

[root@GETTestLNX06 ~]# fdisk /dev/sdb

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

         switch off the mode (command 'c') and change display units to

         sectors (command 'u').

Command (m for help): p

Disk /dev/sdb: 107.4 GB, 107374182400 bytes

255 heads, 63 sectors/track, 13054 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0xd61351c9

   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1       13054   104856223+   5  Extended

Command (m for help): n

Command action

   l   logical (5 or over)

   p   primary partition (1-4)

l

First cylinder (1-13054, default 1): 1

Last cylinder, +cylinders or +size{K,M,G} (1-13054, default 13054): 

Using default value 13054

Command (m for help): p

Disk /dev/sdb: 107.4 GB, 107374182400 bytes

255 heads, 63 sectors/track, 13054 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0xd61351c9

   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1       13054   104856223+   5  Extended

/dev/sdb5               1       13054   104856192   83  Linux

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

2: Format logical partitions

[root@GETTestLNX06 ~]# mkfs.ext4 /dev/sdb5

mke2fs 1.41.12 (17-May-2010)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

6553600 inodes, 26214048 blocks

1310702 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=4294967296

800 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks: 

        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 

        4096000, 7962624, 11239424, 20480000, 23887872

Writing inode tables: done                            

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 28 mounts or

180 days, whichever comes first.  Use tune2fs -c or -i to override.

3: Write the mounting information to the configuration file.

Edit [root @ GETTestLNX06 ~] # Vi/etc/fstab

4: mount the new partition

[root@GETTestLNX06 ~]# cd /

[root@GETTestLNX06 /]# mkdir u01

[root@GETTestLNX06 /]# mount -a

[root@GETTestLNX06 /]# df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/vg_gettestlnx06-lv_root

                       44G  2.3G   40G   6% /

tmpfs                 3.9G     0  3.9G   0% /dev/shm

/dev/sda1             477M   33M  419M   8% /boot

/dev/sdb5              99G   60M   94G   1% /u01

[root@GETTestLNX06 /]# 

[References]:

Http://www.docin.com/p-670819195.html