分区工具fdisk，gdisk，parted
在linux中，当我们给系统添加一块新硬盘时，我们是无法使用的，因为他还没有分区和格式化，只有当我们将新硬盘分区并格式化之后，挂载在某个目录下，才能供我们正常使用，接下来我们要学习三种硬盘分区工具，fdisk，gdisk，parted，分别是针对于MBR分区格式，GPT分区格式，高级分区工具（可以针对于上面两种进行分区，使用起来也是比较复杂的），关于MBR和GPT请参考硬盘结构基础
fdisk（MBR）
fdisk
-l /dev/sdX 查看硬盘分区信息
-c （centos6) 打开或禁用dos模式
-u (centos6) 切换显示的单位(扇区/柱面)
-c (centos7) -c=dos -c=nondos
-u (centos7) -u=cylinders -u=sectors
fdisk /dev/sdX 进行分区
m 帮助
n 建立分区
d 删除分区
p 显示分区信息
t 转换分区类型
a 将指定分区设置/取消 活动分区
L 查看分区类型
o 重建分区表
v 验证分区表，显示剩余没有被分区划分的扇区数量
g 创建GPT格式的分区（centos7)
q 退出不保存，不保存，所有的修改都不生效
w 退出并保存
[root@CT6 ~]# fdisk -l /dev/sdb WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sdb: 536.9 GB, 536870912000 bytes -------------------------硬盘大小 255 heads, 63 sectors/track, 65270 cylinders ------------------------磁头数，每磁道扇区数，柱面数 Units = cylinders of 16065 * 512 = 8225280 bytes --------------------每柱面大小 Sector size (logical/physical): 512 bytes / 512 bytes ---------------扇区大小 I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 -----------------------------------------未分区磁盘
[root@CT6 ~]# fdisk /dev/sdb --------------------------磁盘分区 WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted. Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel with disk identifier 0x52ce01ab. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won't be recoverable. Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite) 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): m ------------------------查看帮助 Command action a toggle a bootable flag b edit bsd disklabel c toggle the dos compatibility flag d delete a partition 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):
Command (m for help): n ------------------------------添加一个分区 Command action e extended p primary partition (1-4) p ---------------------------------------------添加主分区 Partition number (1-4): 1 ----------------------------磁盘编号1，即：sdb1 First cylinder (1-65270, default 1): -------------------开始位置，不填写，默认就行 Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-65270, default 65270): +20G -----------填写大小 Command (m for help): p --------------------------------查看刚刚的分区 Disk /dev/sdb: 536.9 GB, 536870912000 bytes 255 heads, 63 sectors/track, 65270 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: 0x52ce01ab Device Boot Start End Blocks Id System /dev/sdb1 1 2612 20980858+ 83 Linux -----------------创建了一个分区
Command (m for help): l ------------------查看可用的分区类型 0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris 1 FAT12 39 Plan 9 82 Linux swap / So c1 DRDOS/sec (FAT- 2 XENIX root 3c PartitionMagic 83 Linux c4 DRDOS/sec (FAT- 3 XENIX usr 40 Venix 80286 84 OS/2 hidden C: c6 DRDOS/sec (FAT- 4 FAT16 <32M 41 PPC PReP Boot 85 Linux extended c7 Syrinx 5 Extended 42 SFS 86 NTFS volume set da Non-FS data 6 FAT16 4d QNX4.x 87 NTFS volume set db CP/M / CTOS / . 7 HPFS/NTFS 4e QNX4.x 2nd part 88 Linux plaintext de Dell Utility 8 AIX 4f QNX4.x 3rd part 8e Linux LVM df BootIt 9 AIX bootable 50 OnTrack DM 93 Amoeba e1 DOS access a OS/2 Boot Manag 51 OnTrack DM6 Aux 94 Amoeba BBT e3 DOS R/O b W95 FAT32 52 CP/M 9f BSD/OS e4 SpeedStor c W95 FAT32 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi eb BeOS fs e W95 FAT16 (LBA) 54 OnTrackDM6 a5 FreeBSD ee GPT f W95 Ext'd (LBA) 55 EZ-Drive a6 OpenBSD ef EFI (FAT-12/16/ 10 OPUS 56 Golden Bow a7 NeXTSTEP f0 Linux/PA-RISC b 11 Hidden FAT12 5c Priam Edisk a8 Darwin UFS f1 SpeedStor 12 Compaq diagnost 61 SpeedStor a9 NetBSD f4 SpeedStor 14 Hidden FAT16 <3 63 GNU HURD or Sys ab Darwin boot f2 DOS secondary 16 Hidden FAT16 64 Novell Netware af HFS / HFS+ fb VMware VMFS 17 Hidden HPFS/NTF 65 Novell Netware b7 BSDI fs fc VMware VMKCORE 18 AST SmartSleep 70 DiskSecure Mult b8 BSDI swap fd Linux raid auto 1b Hidden W95 FAT3 75 PC/IX bb Boot Wizard hid fe LANstep 1c Hidden W95 FAT3 80 Old Minix be Solaris boot ff BBT 1e Hidden W95 FAT1 Command (m for help):
Command (m for help): w -----------------------保存并退出 The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks.
gdisk（GPT）
gdisk
-l /dev/sdX 查看分区信息
gdisk
(?|m) 帮助
n 建立分区
d 删除分区
c 更改分区名字
I 显示分区的详细信息
p 显示分区信息
t转换分区类型
a 将指定分区设置/取消 活动分区
l 查看分区类型
o 重建分区表
v 验证分区表，显示剩余没有被分区划分的扇区数量
q 退出不保存，不保存，所有的修改都不生效
w 退出并保存
gdisk时用来创建GPT分区的，我们可以看到，gdisk和fdisk的开头是有些不同的。
[root@CT6 ~]# gdisk /dev/sdb GPT fdisk (gdisk) version 0.8.10 Partition table scan: MBR: not present BSD: not present APM: not present GPT: present Found valid GPT with corrupt MBR; using GPT and will write new protective MBR on save. Command (? for help):
一个GPT分区
Command (? for help): o This option deletes all partitions and creates a new protective MBR. Proceed? (Y/N): y Command (? for help): p Disk /dev/sdb: 1048576000 sectors, 500.0 GiB ----------------磁盘大小，显示扇区数 Logical sector size: 512 bytes ---------------------------扇区大小 Disk identifier (GUID): E072194E-C4DA-449B-9CF9-E5171235E6D3 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 1048575966 -------------------第一个有用的扇区在34，最后一个有用的扇区在104857966 Partitions will be aligned on 2048-sector boundaries Total free space is 1048575933 sectors (500.0 GiB) Number Start (sector) End (sector) Size Code Name Command (? for help):
更改磁盘的类型
Command (? for help): t ------------------------------------------更改磁盘类型 Using 1 Current type is 'Linux filesystem' Hex code or GUID (L to show codes, Enter = 8300): 8e00 Changed type of partition to 'Linux LVM' -------------------------更改为"Linux LVM" Command (? for help): p Disk /dev/sdb: 1048576000 sectors, 500.0 GiB Logical sector size: 512 bytes Disk identifier (GUID): E072194E-C4DA-449B-9CF9-E5171235E6D3 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 1048575966 Partitions will be aligned on 2048-sector boundaries Total free space is 838860733 sectors (400.0 GiB) Number Start (sector) End (sector) Size Code Name 1 2048 209717247 100.0 GiB 8E00 Linux LVM ------------------------ 改过了 Command (? for help):
当我们查看磁盘的时候，我们首先要看磁盘是那种分区格式的，如果是MBR分区格式，我们最好使用fdisk –l，要是为GPT分区格式的硬盘，我们就使用gdisk –l来查看。因为fdisk查看GPT格式的磁盘最大能看到2T，再多的磁盘分区就无法查看，还会出错。
parted(高级分区工具)
parted命令是由GNU组织开发的一款功能强大的磁盘分区和分区大小调整工具，与fdisk不同，它支持调整分区的大小。作为一种设计用于Linux的工具，它没有构建成处理与fdisk关联的多种分区类型，但是，它可以处理最常见的分区格式，包括：ext2、ext3、fat16、fat32、NTFS、ReiserFS、JFS、XFS、UFS、HFS以及Linux交换分区。
parted
-h 显示帮助信息
-l 显示磁盘信息
-s 脚本模式，不提示用户
-v 显示版本号
[root@CT6 ~]# parted -h Usage: parted [OPTION]... [DEVICE [COMMAND [PARAMETERS]...]...] Apply COMMANDs with PARAMETERS to DEVICE. If no COMMAND(s) are given, run in interactive mode. OPTIONs: -h, --help displays this help message -l, --list lists partition layout on all block devices -m, --machine displays machine parseable output -s, --script never prompts for user intervention -v, --version displays the version -a, --align=[none|cyl|min|opt] alignment for new partitions COMMANDs: align-check TYPE N check partition N for TYPE(min|opt) alignment check NUMBER do a simple check on the file system cp [FROM-DEVICE] FROM-NUMBER TO-NUMBER copy file system to another partition
... ...
[root@CT6 ~]# parted -l Model: VMware, VMware Virtual S (scsi) Disk /dev/sda: 215GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 1075MB 1074MB primary ext4 boot 2 1075MB 54.8GB 53.7GB primary ext4 3 54.8GB 108GB 53.7GB primary ext4 4 108GB 215GB 106GB extended 5 108GB 113GB 4295MB logical linux-swap(v1) 6 113GB 134GB 21.5GB logical
parted /dev/sdX 分区
mklabel label_type 设置分区格式（MBR，GPT）
mkpart part-type [fs-type] start end(单位Mb)设置分区
print 查看分区信息
help [command] 查看命令[command]如何使用
rm num 删除一个分区
set num flag status 设置flag（boot，root，swap）状态（on，off）
quit 退出
开始分区
[root@CT6 ~]# parted /dev/sdb GNU Parted 2.1 Using /dev/sdb Welcome to GNU Parted! Type 'help' to view a list of commands. (parted)
查看帮助
(parted) help align-check TYPE N check partition N for TYPE(min|opt) alignment check NUMBER do a simple check on the file system cp [FROM-DEVICE] FROM-NUMBER TO-NUMBER copy file system to another partition help [COMMAND] print general help, or help on COMMAND --------------------查看命令如何使用 mklabel,mktable LABEL-TYPE create a new disklabel (partition table) ------------------设置磁盘类型 mkfs NUMBER FS-TYPE make a FS-TYPE file system on partition NUMBER mkpart PART-TYPE [FS-TYPE] START END make a partition -------------------------------------------磁盘分区 mkpartfs PART-TYPE FS-TYPE START END make a partition with a file system move NUMBER START END move partition NUMBER name NUMBER NAME name partition NUMBER as NAME print [devices|free|list,all|NUMBER] display the partition table, available devices, --------------查看分区 free space, all found partitions, or a particular partition quit exit program rescue START END rescue a lost partition near START and END resize NUMBER START END resize partition NUMBER and its file system rm NUMBER delete partition NUMBER -----------------------------------删除分区 select DEVICE choose the device to edit set NUMBER FLAG STATE change the FLAG on partition NUMBER toggle [NUMBER [FLAG]] toggle the state of FLAG on partition NUMBER unit UNIT set the default unit to UNIT version display the version number and copyright information of GNU Parted (parted)
(parted) help mklabel mklabel,mktable LABEL-TYPE create a new disklabel (partition table) LABEL-TYPE is one of: aix, amiga, bsd, dvh, gpt, mac, msdos, pc98, sun, loop --------------可以设置的类型 (parted)
(parted) mklabel gpt ------------------------------设置GPT分区
(parted) print Model: VMware, VMware Virtual S (scsi) Disk /dev/sdb: 537GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags (parted)
(parted) help mkpart ----------------------------------查看分区命令如何用 mkpart PART-TYPE [FS-TYPE] START END make a partition PART-TYPE is one of: primary, logical, extended FS-TYPE is one of: ext4, ext3, ext2, fat32, fat16, hfsx, hfs+, hfs, jfs, swsusp, linux-swap(v1), linux-swap(v0), ntfs, reiserfs, hp-ufs, sun-ufs, xfs, apfs2, apfs1, asfs, amufs5, amufs4, amufs3, amufs2, amufs1, amufs0, amufs, affs7, affs6, affs5, affs4, affs3, affs2, affs1, affs0, linux-swap, linux-swap(new), linux-swap(old) START and END are disk locations, such as 4GB or 10%. Negative values count from the end of the disk. For example, -1s specifies exactly the last sector. 'mkpart' makes a partition without creating a new file system on the partition. FS-TYPE may be specified to set an appropriate partition ID. (parted) mkpart primary 0 200G -------------------------------------------------设置分区 Warning: The resulting partition is not properly aligned for best performance. Ignore/Cancel? ignore (parted) print -----------------------------------------------------查看分区 Model: VMware, VMware Virtual S (scsi) Disk /dev/sdb: 537GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 17.4kB 200GB 200GB primary -------------------------------分区大小 (parted) quit Information: You may need to update /etc/fstab.
这个命令是一个实时生效的命令，当我们分完一个区后，不用结束就可以直接生效，不像fdisk和gdisk那样需要退出后才保存生效。
lsblk
列出块设备
lsblk命令用于列出所有可用块设备的信息，而且还能显示他们之间的依赖关系，但是它不会列出RAM盘的信息。块设备有硬盘，闪存盘，cd-ROM等等
如：
lsblk /dev/sdb
[root@CT6 ~]# lsblk /dev/sda NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 200G 0 disk ├─sda1 8:1 0 1G 0 part /boot ├─sda2 8:2 0 50G 0 part / ├─sda3 8:3 0 50G 0 part /app ├─sda4 8:4 0 1K 0 part ├─sda5 8:5 0 4G 0 part [SWAP] └─sda6 8:6 0 20G 0 part
查看内核是否已经识别新的分区：
cat /proc/partations
[root@CT6 ~]# cat /proc/partitions major minor #blocks name 8 0 209715200 sda 8 1 1048576 sda1 8 2 52428800 sda2 8 3 52428800 sda3 8 4 1 sda4 8 5 4194304 sda5 8 6 20980890 sda6 8 16 524288000 sdb 8 17 195312483 sdb1
我们在原硬盘未使用的空间进行分区后，在物理设备上已经完成了，使用fdisk -l可以查看到，但是内存信息中并没有新的分区信息，此时我们需要手动更新分区表，在centOS6中使用partx，在5 或者7中可以使用partprobe（这个在6中有BUG）
partx -a /dev/sda 更新内存中的磁盘分区表信息
partx -d --nr 6 /dev/sda 删除掉在内存中的已经删除的第六块分区的信息
刚开始我们就五个分区，无论是内存中的信息，还是物理硬盘
[root@CT6 ~]# lsblk /dev/sda NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 200G 0 disk ├─sda1 8:1 0 1G 0 part /boot ├─sda2 8:2 0 50G 0 part / ├─sda3 8:3 0 50G 0 part /app ├─sda4 8:4 0 1K 0 part └─sda5 8:5 0 4G 0 part [SWAP]
[root@CT6 ~]# fdisk -l /dev/sda | grep "^/dev/sda*" /dev/sda1 * 1 131 1048576 83 Linux /dev/sda2 131 6658 52428800 83 Linux /dev/sda3 6658 13185 52428800 83 Linux /dev/sda4 13185 26109 103808000 5 Extended /dev/sda5 13186 13708 4194304 82 Linux swap / Solaris
接下来，我们创建一个分区
Command (m for help): n First cylinder (13185-26109, default 13185): 14000 Last cylinder, +cylinders or +size{K,M,G} (14000-26109, default 26109): +10G Command (m for help): p Disk /dev/sda: 214.7 GB, 214748364800 bytes 255 heads, 63 sectors/track, 26108 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: 0x0007a903 Device Boot Start End Blocks Id System /dev/sda1 * 1 131 1048576 83 Linux /dev/sda2 131 6658 52428800 83 Linux /dev/sda3 6658 13185 52428800 83 Linux /dev/sda4 13185 26109 103808000 5 Extended /dev/sda5 13186 13708 4194304 82 Linux swap / Solaris /dev/sda6 14000 15305 10490444+ 83 Linux 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.
我们在分完区以后，如上，显示的红色字体，我们刚刚分好的区并没有被读入内存当中，也就是说我们fdisk可以读到，但是lsblk却无法读到
[root@CT6 ~]# fdisk -l /dev/sda | grep "^/dev/sda.*" /dev/sda1 * 1 131 1048576 83 Linux /dev/sda2 131 6658 52428800 83 Linux /dev/sda3 6658 13185 52428800 83 Linux /dev/sda4 13185 26109 103808000 5 Extended /dev/sda5 13186 13708 4194304 82 Linux swap / Solaris /dev/sda6 14000 15305 10490444+ 83 Linux [root@CT6 ~]# lsblk /dev/sda NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 200G 0 disk ├─sda1 8:1 0 1G 0 part /boot ├─sda2 8:2 0 50G 0 part / ├─sda3 8:3 0 50G 0 part /app ├─sda4 8:4 0 1K 0 part └─sda5 8:5 0 4G 0 part [SWAP]
接下来我们更新一下分区信息
[root@CT6 ~]# partx -a /dev/sda BLKPG: Device or resource busy error adding partition 1 BLKPG: Device or resource busy error adding partition 2 BLKPG: Device or resource busy error adding partition 3 BLKPG: Device or resource busy error adding partition 4 BLKPG: Device or resource busy error adding partition 5 [root@CT6 ~]# lsblk /dev/sda NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 200G 0 disk ├─sda1 8:1 0 1G 0 part /boot ├─sda2 8:2 0 50G 0 part / ├─sda3 8:3 0 50G 0 part /app ├─sda4 8:4 0 1K 0 part ├─sda5 8:5 0 4G 0 part [SWAP] └─sda6 8:6 0 10G 0 part
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