概述
云平臺(tái)客戶的服務(wù)器可能會(huì)隨著業(yè)務(wù)量的不斷增長(zhǎng)造成磁盤(pán)空間不足的情況，比如：共享文件服務(wù)器硬盤(pán)空間不足，在這個(gè)時(shí)候就需要增加磁盤(pán)空間，來(lái)滿足線上的業(yè)務(wù)；又或者我們?cè)谑褂胠inux的過(guò)程中, 有時(shí)會(huì)因?yàn)榘惭b系統(tǒng)時(shí)分區(qū)不當(dāng)導(dǎo)致有的分區(qū)空間不足，而有的分區(qū)空間過(guò)剩的情況，都可以是使用fdisk分區(qū)工具來(lái)動(dòng)態(tài)調(diào)整分區(qū)的大??；
步驟
1.備份
就算是無(wú)損的擴(kuò)容，但難免會(huì)出什么意外，備份是必不可少的，一般云平臺(tái)都有備份功能，可直接對(duì)磁盤(pán)做一次全量備份。
2.用fdisk重新分區(qū)
默認(rèn)的分區(qū)如下
root@i-abnawjwo:/# df
Filesystem 1K-blocks Used Available Use% Mounted on
udev 497752 4 497748 1% /dev
tmpfs 101700 440 101260 1% /run
/dev/sda1 20509308 1337636 18106816 7% /
none 4 0 4 0% /sys/fs/cgroup
none 5120 0 5120 0% /run/lock
none 508488 0 508488 0% /run/shm
none 102400 0 102400 0% /run/user
/dev/sdc1 10190136 23032 9626432 1% /data
root@i-abnawjwo:/data# cat hello
test1
卸載當(dāng)前的分區(qū) umount /dev/sdc1
若是卸載不掉，有可能是有進(jìn)程再用，可以用fuser或者lsof查看
fuser -m -v /data
fuser -m -v -i -k /data
lsof /data
卸載掉后fdisk刪除原來(lái)的分區(qū)，重新分區(qū)， 注意開(kāi)始的磁柱號(hào)要和原來(lái)的一致（這是保證數(shù)據(jù)不丟失的關(guān)鍵步驟）
root@i-abnawjwo:/# umount /data
root@i-abnawjwo:/# fdisk /dev/sdc
Command (m for help): d
Selected partition 1
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
Using default value 1
First sector (2048-104857599, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-104857599, default 104857599):
Using default value 104857599
Command (m for help): p
Disk /dev/sdc: 53.7 GB, 53687091200 bytes
64 heads, 32 sectors/track, 51200 cylinders, total 104857600 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: 0x305cddae
Device Boot Start End Blocks Id System
/dev/sdc1 2048 104857599 52427776 83 Linux
Command (m for help): wq
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
重啟系統(tǒng)
3.檢測(cè)分區(qū)，擴(kuò)展分區(qū)大小
root@i-abnawjwo:~# e2fsck -f /dev/sdb1
e2fsck 1.42.9 (4-Feb-2014)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/sdb1: 12/655360 files (0.0% non-contiguous), 79664/2621440 blocks
root@i-abnawjwo:~# resize2fs -p /dev/sdb1
resize2fs 1.42.9 (4-Feb-2014)
Resizing the filesystem on /dev/sdb1 to 13106944 (4k) blocks.
The filesystem on /dev/sdb1 is now 13106944 blocks long.
4.重新掛載，查看分區(qū)大小，檢查數(shù)據(jù)
root@i-abnawjwo:~# mount /dev/sdb1 /data/
root@i-abnawjwo:/data# cat hello
acasdcacsa
root@i-abnawjwo:/data# df
Filesystem 1K-blocks Used Available Use% Mounted on
udev 497752 4 497748 1% /dev
tmpfs 101700 428 101272 1% /run
/dev/sda1 20509308 1337768 18106684 7% /
none 4 0 4 0% /sys/fs/cgroup
none 5120 0 5120 0% /run/lock
none 508488 0 508488 0% /run/shm
none 102400 0 102400 0% /run/user
/dev/sdb1 51474044 33100 48803172 1% /data
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。
