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centos下如何使用fdisk擴(kuò)展分區(qū)容量大小

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擴(kuò)展磁盤(pán)空間

硬盤(pán)空間為20G,使用vSphere Client增加磁盤(pán)大小,需要再增加10G空間;

擴(kuò)展完后,重啟系統(tǒng),再次使用fdisk -l查看,會(huì)發(fā)現(xiàn)硬盤(pán)空間變大了;

[root@linuxprobe ~]# fdisk -l
Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 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: 0x0005210c

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          26      204800   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              26        1301    10240000   83  Linux
/dev/sda3            1301        1497     1572864   82  Linux swap / Solaris
/dev/sda4            1497        2611     8952832   83  Linux
[root@linuxprobe ~]# df -hT
Filesystem     Type   Size  Used Avail Use% Mounted on
/dev/sda2      ext4   9.7G  1.5G  7.7G  16% /
tmpfs          tmpfs  939M     0  939M   0% /dev/shm
/dev/sda1      ext4   194M   34M  151M  19% /boot
/dev/sda4      ext4   8.5G  148M  7.9G   2% /data

重新創(chuàng)建分區(qū),調(diào)整分區(qū)信息

本次實(shí)驗(yàn)主要對(duì)/dev/sda4這個(gè)分區(qū)擴(kuò)展,如果是生產(chǎn)環(huán)境,請(qǐng)?zhí)崆白龊脗浞荼4娴狡渌謪^(qū),雖然擴(kuò)展分區(qū)大小不會(huì)導(dǎo)致數(shù)據(jù)丟失,安全起見(jiàn),請(qǐng)?zhí)崆白龊脗浞荩?/p>

首先模擬出一些數(shù)據(jù):

[root@linuxprobe data]# mkdir test
[root@linuxprobe data]# echo "we are Linuxer" > linuxprobe
[root@linuxprobe data]# ll
total 24
-rw-r--r--. 1 root root    15 May 23 21:59 linuxprobe
drwx------. 2 root root 16384 May 23 15:07 lost+found
drwxr-xr-x. 2 root root  4096 May 23 21:51 test
[root@linuxprobe ~]# umount /dev/sda4          #卸載磁盤(pán)分區(qū)

若提示磁盤(pán)忙,使用fuser找出將正在使用磁盤(pán)的程序并結(jié)束掉;

fuser -m -v /data
fuser -m -v -i -k /data

使用fdisk工具先刪除/dev/sda4分區(qū),然后創(chuàng)建新分區(qū),注意開(kāi)始的磁柱號(hào)要和原來(lái)的一致(是保證數(shù)據(jù)不丟失的關(guān)鍵步驟),結(jié)束的磁柱號(hào)默認(rèn)回車(chē)使用全部磁盤(pán)。

[root@linuxprobe ~]# fdisk /dev/sda

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        #查看分區(qū)表信息Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 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: 0x0005210c

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          26      204800   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              26        1301    10240000   83  Linux
/dev/sda3            1301        1497     1572864   82  Linux swap / Solaris
/dev/sda4            1497        2611     8952832   83  Linux

Command (m for help): d           #刪除分區(qū)Partition number (1-4): 4         #刪除第四個(gè)Command (m for help): p       #再次查看分區(qū)信息,/dev/sda4已被刪除Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 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: 0x0005210c

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          26      204800   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              26        1301    10240000   83  Linux
/dev/sda3            1301        1497     1572864   82  Linux swap / Solaris

Command (m for help): n      #創(chuàng)建新的分區(qū)Command action
   e   extended
   p   primary partition (1-4)
p             #創(chuàng)建為主分區(qū)
Selected partition 4
First cylinder (1497-3916, default 1497):          #經(jīng)對(duì)比,正好和上一個(gè)磁盤(pán)柱一致,默認(rèn)即可Using default value 1497
Last cylinder, +cylinders or +size{K,M,G} (1497-3916, default 3916): 
Using default value 3916              #直接默認(rèn)就可以Command (m for help): p               #查看分區(qū)表信息Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 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: 0x0005210c

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          26      204800   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              26        1301    10240000   83  Linux
/dev/sda3            1301        1497     1572864   82  Linux swap / Solaris
/dev/sda4            1497        3916    19436582   83  Linux

Command (m for help): wp       #保存并退出,如果創(chuàng)建有誤,直接退出不要保存即可The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.

重新創(chuàng)建分區(qū)后,需要重啟一下;

[root@linuxprobe ~]# init 6
[root@linuxprobe ~]# e2fsck -f /dev/sda4                #檢查分區(qū)信息[root@linuxprobe ~]# resize2fs -p /dev/sda4             #調(diào)整分區(qū)大小

重新掛載、查看分區(qū)大小、數(shù)據(jù)

[root@linuxprobe ~]# mount /dev/sda4 /data
[root@linuxprobe ~]# df -hT
[root@linuxprobe ~]# cat /data/linuxprobe
we are  Linuxer

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