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场景：
在初步完成学生机房虚拟化设计后所映现出来的问题。由于磁盘的分区过大，导致在备份还原系统时时间会很长，且存在fat32分区，导致Clonezilla速度明显减慢。
具体描述：
现在我需要做的是，删除两个分区，然后创建一个较小分区。注意，此处所指分区均不是系统分区，而是本人在安装系统时自行创建的。
删除分区：
shenzhi@sz0850:~$ sudo fdisk /dev/sda
Command (m for help): p Disk /dev/sda: 250.1 GB, 250058268160 bytes 255 heads, 63 sectors/track, 30401 cylinders, total 488395055 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: 0x8d4bc3f7 Device Boot Start End Blocks Id System /dev/sda1 * 2048 585727 291840 83 Linux /dev/sda2 162701310 488392064 162845377+ f W95 Ext'd (LBA) /dev/sda3 585728 156835839 78125056 83 Linux /dev/sda4 156835840 162695167 2929664 82 Linux swap / Solaris /dev/sda5 419473278 488392064 34459393+ b W95 FAT32 /dev/sda6 162701312 419471359 128385024 83 Linux Partition table entries are not in disk order此处需要删除的就是/dev/sda5、/dev/sda6两个分区，记得删除后还要保存才是。
Command (m for help): d Partition number (1-6): 6 Command (m for help): d Partition number (1-5): 5创建分区：
Command (m for help): n
First sector (162703358-488392064, default 162703358): Using default value 162703358 Last sector, +sectors or +size{K,M,G} (162703358-488392064, default 488392064):+25G分区结果：
Command (m for help): p
Disk /dev/sda: 250.1 GB, 250058268160 bytes 255 heads, 63 sectors/track, 30401 cylinders, total 488395055 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: 0x8d4bc3f7 Device Boot Start End Blocks Id System /dev/sda1 * 2048 585727 291840 83 Linux /dev/sda2 162701310 488392064 162845377+ f W95 Ext'd (LBA) /dev/sda3 585728 156835839 78125056 83 Linux /dev/sda4 156835840 162695167 2929664 82 Linux swap / Solaris /dev/sda5 162703358 215132157 26214400 83 Linux Partition table entries are not in disk order Command (m for help): w 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.一定要记得在确定无误后保存对磁盘的修改，w的意思就是写入对磁盘的修改
磁盘格式化：
此处只是一个例子，而非上述新建的25G磁盘
shenzhi@sz0850:~$ sudo mkfs -t ext4 /dev/sda5
mke2fs 1.41.14 (22-Dec-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 2154496 inodes, 8614848 blocks 430742 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=0 263 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 Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 36 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override.查看新建分区的uuid：
shenzhi@sz0850:~$ ls -l /dev/disk/by-uuid/
从这里可以看出，UUID其实是对硬盘物理分区的一个软链接
total 0 lrwxrwxrwx 1 root root 10 2012-01-06 15:52 2f3c44ac-7e62-4d78-af27-cb6a2a2c50f4 -> ../../sda1 lrwxrwxrwx 1 root root 10 2012-01-06 15:52 4afba6a9-1e8b-4412-bc69-a9c6b119b015 -> ../../sda4 lrwxrwxrwx 1 root root 10 2012-01-06 15:52 b318e04d-999c-4f93-b1e4-0b43283d46f8 -> ../../sda3 lrwxrwxrwx 1 root root 10 2012-01-06 15:52 f5b0f47a-a0b9-48d7-8cd0-943c33fe579e -> ../../sda5还有一种方法也可以查看UUID：
修改挂载：
注意观察加粗部分
shenzhi@sz0850:~$ sudo vi /etc/fstab # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 # / was on /dev/sda3 during installation UUID=b318e04d-999c-4f93-b1e4-0b43283d46f8 / ext4 errors=remount-ro 0 1 # /boot was on /dev/sda1 during installation UUID=2f3c44ac-7e62-4d78-af27-cb6a2a2c50f4 /boot ext4 defaults 0 2 # /vmos was on /dev/sda6 during installationUUID=545352eb-e087-4d75-8206-d8c5e275b4bb /vmos ext4 defaults 0 2 # swap was on /dev/sda4 during installation UUID=4afba6a9-1e8b-4412-bc69-a9c6b119b015 none swap sw0 0
修改后：shenzhi@sz0850:~$ sudo vi /etc/fstab
# /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 # / was on /dev/sda3 during installation UUID=b318e04d-999c-4f93-b1e4-0b43283d46f8 / ext4 errors=remount-ro 0 1 # /boot was on /dev/sda1 during installation UUID=2f3c44ac-7e62-4d78-af27-cb6a2a2c50f4 /boot ext4 defaults 0 2 # /vmos was on /dev/sda5 during installation UUID=f5b0f47a-a0b9-48d7-8cd0-943c33fe579e /vmos ext4 defaults 0 2 # swap was on /dev/sda4 during installation UUID=4afba6a9-1e8b-4412-bc69-a9c6b119b015 none swap sw 0 0至此，关于磁盘的调整结束。
本文转自tiancong 51CTO博客，原文链接:http://blog.51cto.com/tiancong/758943
转载地址：http://paezo.baihongyu.com/