Linux使用fdisk进行gpt超大磁盘的分区与挂载

磁盘分区与挂载是Linux使用过程之中比较基础的部分

创建分区

[root@7-64-test ~]# fdisk -l					//查询磁盘情况

Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 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 label type: dos
Disk identifier: 0x000c145a

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      616447      307200   83  Linux
/dev/sda2          616448    41943039    20663296   8e  Linux LVM

Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 sectors		//新增加的空白磁盘
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 /dev/mapper/centos-root: 17.9 GB, 17930649600 bytes, 35020800 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 /dev/mapper/centos-swap: 3221 MB, 3221225472 bytes, 6291456 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

[root@7-64-test ~]# fdisk -l /dev/sdb			//查看新增的磁盘								

Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 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

[root@7-64-test ~]# fdisk  /dev/sdb				//进行分区
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x1bdd0658.

Command (m for help): p

Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 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 label type: dos
Disk identifier: 0x1bdd0658

   Device Boot      Start         End      Blocks   Id  System

Command (m for help): m
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   g   create a new empty GPT partition table
   G   create an IRIX (SGI) partition table
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

Command (m for help): g					//创建gpt磁盘
Building a new GPT disklabel (GUID: 26965E7C-1CD5-4EB3-B1F4-DE7E5B896224)


Command (m for help): p

Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 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 label type: gpt
Disk identifier: 26965E7C-1CD5-4EB3-B1F4-DE7E5B896224


#         Start          End    Size  Type            Name

Command (m for help): n						//新建分区
Partition number (1-128, default 1): 
First sector (2048-2097118, default 2048): 
Last sector, +sectors or +size{K,M,G,T,P} (2048-2097118, default 2097118): +100M
Created partition 1


Command (m for help): p

Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 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 label type: gpt
Disk identifier: 26965E7C-1CD5-4EB3-B1F4-DE7E5B896224


#         Start          End    Size  Type            Name
 1         2048       206847    100M  Linux filesyste 

Command (m for help): w						//保存退出
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

格式化新增的分区

[root@7-64-test ~]# mkfs.xfs /dev/sdb1			//格式化新建的分区
meta-data=/dev/sdb1              isize=512    agcount=4, agsize=6400 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=25600, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=855, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
[root@7-64-test ~]# partprobe 				//无需重启加载分区信息
Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0 has been opened read-only.							//这个警告无关紧要

挂载新建的分区

[root@7-64-test ~]# mount /dev/sdb1 /root/test_mnt/			//挂载新建的分区

写入测试数据并查看挂载情况

[root@7-64-test ~]# dd if=/dev/zero of=/root/test_mnt/test.txt bs=1M count=40		//写入测试的数据
40+0 records in
40+0 records out
41943040 bytes (42 MB) copied, 0.0232881 s, 1.8 GB/s
[root@7-64-test ~]# df -Th						//查看挂载情况
Filesystem              Type      Size  Used Avail Use% Mounted on
devtmpfs                devtmpfs  475M     0  475M   0% /dev
tmpfs                   tmpfs     487M     0  487M   0% /dev/shm
tmpfs                   tmpfs     487M  7.7M  479M   2% /run
tmpfs                   tmpfs     487M     0  487M   0% /sys/fs/cgroup
/dev/mapper/centos-root xfs        17G  2.6G   15G  16% /
/dev/sda1               xfs       297M  120M  178M  41% /boot
tmpfs                   tmpfs      98M     0   98M   0% /run/user/0
/dev/sdb1               xfs        97M   46M   52M  47% /root/test_mnt
[root@7-64-test ~]# du -sh /root/test_mnt/			//查询挂载点使用情况
40M	/root/test_mnt/

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