我所接触的linux分区分为两种，一种是使用fdisk分区，另外一种是parted分区。前者是针对MBR模式分区的，后者是针对GPT模式分区的
fdisk分区：
fdisk -l ---->查看磁盘信息 fdisk /dev/sdc --->选择需要操作的磁盘（eg:/dev/sdc）
a toggle a bootable flag
b edit bsd disklabel c toggle the dos compatibility flag d delete a partition ---->删除一个分区 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 ---->创建一个新分区 o create a new empty DOS partition table p print the partition table q quit without saving changes ---->退出分区操作 s create a new empty Sun disklabel t change a partition's system id ---->分区ID (逻辑分区为8e) u change display/entry units v verify the partition table w write table to disk and exit ---->保存分区操作 x extra functionality (experts only)1 创建分区示例： 2 Command (m for help): n 3 Partition type: 4 p primary (0 primary, 0 extended, 4 free) 5 e extended 6 Select (default p): p 7 Partition number (1-4, default 1): 1 8 First sector (2048-4194303, default 2048): 9 Using default value 204810 Last sector, +sectors or +size{K,M,G} (2048-4194303, default 4194303):11 Using default value 419430312 Partition 1 of type Linux and of size 2 GiB is set13 14 Command (m for help): t15 Selected partition 116 Hex code (type L to list all codes): 8e17 Changed type of partition 'Linux' to 'Linux LVM' 创建及扩展逻辑卷
[root@localhost ~]# pvcreate /dev/sdc1 ---->创建pv Physical volume "/dev/sdc1" successfully created[root@localhost ~]# vgextend rhel /dev/sdc1 ---->扩展vg卷组 Volume group "rhel" successfully extended[root@localhost ~]# vgreduce rhel /dev/sdc1 --->如果不想再加入到已有的vg里面，想自己建一个vg卷组，将刚刚扩展进去的pv给移除出来，Removed "/dev/sdc1" from volume group "rhel"[root@localhost ~]# vgcreate vg2 /dev/sdc1 --->创建新的vg，并设置vg名为vg2Volume group "vg2" successfully created[root@localhost ~]# lvextend /dev/rhel/root /dev/sdc1Physical Volume "/dev/sdc1" not found in Volume Group "rhel". --->没添加进vg组，直接扩展到逻辑卷会报错,如要扩展需，先vgextend到相应的vg组[root@localhost ~]# pvremove /dev/sdc1 ---->移除pvLabels on physical volume "/dev/sdc1" successfully wiped 如lvextend加入错入则如下解决
[root@localhost ~]# lvextend /dev/rhel/root /dev/sdc1 ---->将扩展的/dev/sdc1扩展至/dev/rhe1/root中，随后感觉扩展错误，怎么退出， Size of logical volume rhel/root changed from 90.46 GiB (23158 extents) to 92.46 GiB (23669 extents). --->记住该extents大小，是从23158变为了23669 Logical volume root successfully resized[root@localhost ~]# lvreduce -l 23158 /dev/rhel/root ---->这里是将扩展进去的/dev/sdc1给退出来，-l参数 指定extents大小 ，指定缩减后/dev/rhel/root的大小 WARNING: Reducing active and open logical volume to 90.46 GiB THIS MAY DESTROY YOUR DATA (filesystem etc.)Do you really want to reduce root? [y/n]: y Size of logical volume rhel/root changed from 92.46 GiB (23669 extents) to 90.46 GiB (23158 extents). Logical volume root successfully resized ---->成功，之后可重新扩展
[root@localhost ~]# lvcreate -l +100%Free rhel /dev/sdc1 -n lv2 ---->重新创建一个lv卷，-n参数 指定创建后的卷名字 rhel是卷组 ，
Logical volume "lv2" created.parted分区：
[root@localhost ~]# partedGNU Parted 3.1Using /dev/sdaWelcome to GNU Parted! Type 'help' to view a list of commands.(parted) select /dev/sdc ---->选择要操作的分区，一定要注意所执行的磁盘Using /dev/sdc(parted) p ---->查看当前分区信息Model: VMware, VMware Virtual S (scsi)Disk /dev/sdc: 2147MBSector size (logical/physical): 512B/512BPartition Table: gptDisk Flags:Number Start End Size File system Name Flags 1 1049kB 2146MB 2145MB p lvm(parted) mklabel GPT ---->磁盘格式化为GPT模式，之前是则不需要格式化Warning: The existing disk label on /dev/sdc will be destroyed and all data on this disk will be lost. Do you want to continue?Yes/No? yes(parted) mkpart name 0% 100% ---->name为自定义为该分区取名 0% 100% 是磁盘/dev/sdc的区间作为该分区的大小(parted) pModel: VMware, VMware Virtual S (scsi)Disk /dev/sdc: 2147MBSector size (logical/physical): 512B/512BPartition Table: gptDisk Flags:Number Start End Size File system Name Flags 1 1049kB 2146MB 2145MB name(parted) set 1 lvm on ---->依据分区号1,将分区1设置为逻辑卷(parted) rm 1 ---->删除分区号为1的分区(parted) q ---->退出即保存
磁盘格式化后并挂载
容量缩减,方式一 [root@localhost ~]# df -hTFilesystem Type Size Used Avail Use% Mounted on/dev/mapper/rhel-root xfs 93G 15G 78G 16% /devtmpfs devtmpfs 904M 0 904M 0% /devtmpfs tmpfs 914M 80K 914M 1% /dev/shmtmpfs tmpfs 914M 8.9M 905M 1% /runtmpfs tmpfs 914M 0 914M 0% /sys/fs/cgroup/dev/sda1 xfs 497M 124M 373M 25% /boot/dev/mapper/rhel-home xfs 7.0G 65M 7.0G 1% /home[root@localhost ~]# mkfs.ext4 /dev/mapper/rhel-home ---->缩减分区大小需要先将格式变为ext4格式，xfs格式不支持通过resize2fs缩减mke2fs 1.42.9 (28-Dec-2013)Filesystem label=OS type: LinuxBlock size=4096 (log=2)Fragment size=4096 (log=2)Stride=0 blocks, Stripe width=0 blocks458752 inodes, 1835008 blocks91750 blocks (5.00%) reserved for the super userFirst data block=0Maximum filesystem blocks=187904819256 block groups32768 blocks per group, 32768 fragments per group8192 inodes per groupSuperblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632Allocating group tables: doneWriting inode tables: doneCreating journal (32768 blocks): doneWriting superblocks and filesystem accounting information: done[root@localhost ~]# resize2fs /dev/mapper/rhel-home 2G ---->重新指定/rhel-home卷的大小，需要加单位，不加单位则默认为block块resize2fs 1.42.9 (28-Dec-2013)Resizing the filesystem on /dev/mapper/rhel-home to 524288 (4k) blocks.The filesystem on /dev/mapper/rhel-home is now 524288 blocks long.[root@localhost ~]# lvreduce -L 2G /dev/rhel/home ---->2G与上相同 WARNING: Reducing active logical volume to 2.00 GiB THIS MAY DESTROY YOUR DATA (filesystem etc.)Do you really want to reduce home? [y/n]: y Size of logical volume rhel/home changed from 7.00 GiB (1792 extents) to 2.00 GiB (512 extents). Logical volume home successfully resized[root@localhost ~]# mount /dev/mapper/rhel-home /home/[root@localhost ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/rhel-root 93G 15G 78G 16% /devtmpfs 904M 0 904M 0% /devtmpfs 914M 80K 914M 1% /dev/shmtmpfs 914M 8.9M 905M 1% /runtmpfs 914M 0 914M 0% /sys/fs/cgroup/dev/sda1 497M 124M 373M 25% /boot/dev/mapper/rhel-home 1.9G 21M 1.8G 2% /home
缩减容量:方式二(注：该系统卷root与卷home都为xfs文件系统，与上不同，但该操作与文件系统无关联)一定要慎用，因为操作几次都把home逻辑卷下的用户给搞坏了，后来还得重新建用户。[root@localhost ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/rhel-root 91G 15G 77G 16% /devtmpfs 904M 0 904M 0% /devtmpfs 914M 276K 914M 1% /dev/shmtmpfs 914M 9.1M 905M 1% /runtmpfs 914M 0 914M 0% /sys/fs/cgroup/dev/sda1 497M 124M 373M 25% /boot/dev/mapper/rhel-home 7.0G 65M 7.0G 1% /home/dev/sr0 3.7G 3.7G 0 100% /media[root@localhost ~]# lvreduce -L 88G /dev/rhel/root ---->对根目录操作一定要谨慎再谨慎 WARNING: Reducing active and open logical volume to 88.00 GiB THIS MAY DESTROY YOUR DATA (filesystem etc.)Do you really want to reduce root? [y/n]: y Size of logical volume rhel/root changed from 90.46 GiB (23158 extents) to 88.00 GiB (22528 extents). Logical volume root successfully resized[root@localhost ~]# lvextend /dev/rhel/home /dev/sda2 /dev/sdb1 /dev/sd/dev/sda2 /dev/sdb1[root@localhost ~]# lvextend /dev/rhel/home /dev/sda2 /dev/sdb1 ---->将释放的空间扩展到home卷下 No free extents on physical volume "/dev/sda2". Size of logical volume rhel/home changed from 7.00 GiB (1792 extents) to 9.46 GiB (2422 extents). Logical volume home successfully resized[root@localhost ~]# xfs_growfs /dev/mapper/rhel-home ---->xfs文件系统扩容，ext4使用resize2fs扩容meta-data=/dev/mapper/rhel-home isize=256 agcount=4, agsize=458752 blks = sectsz=512 attr=2, projid32bit=1 = crc=0 finobt=0data = bsize=4096 blocks=1835008, imaxpct=25 = sunit=0 swidth=0 blksnaming =version 2 bsize=4096 ascii-ci=0 ftype=0log =internal bsize=4096 blocks=2560, version=2 = sectsz=512 sunit=0 blks, lazy-count=1realtime =none extsz=4096 blocks=0, rtextents=0data blocks changed from 1835008 to 2480128[root@localhost ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/rhel-root 91G 15G 77G 16% /devtmpfs 904M 0 904M 0% /devtmpfs 914M 276K 914M 1% /dev/shmtmpfs 914M 9.1M 905M 1% /runtmpfs 914M 0 914M 0% /sys/fs/cgroup/dev/sda1 497M 124M 373M 25% /boot/dev/mapper/rhel-home 9.5G 66M 9.4G 1% /home ---->这里扩容了2.5G/dev/sr0 3.7G 3.7G 0 100% /media
添加新卷 [root@localhost ~]# lvcreate -l +100%Free rhel /dev/sda2 -n lv2 --->创建新的lv卷 Logical volume "lv2" created.[root@localhost ~]# mkfs.xfs /dev/mapper/rhel-lv2 ---->将新的lv2卷格式化为xfs格式meta-data=/dev/mapper/rhel-lv2 isize=256 agcount=4, agsize=327680 blks = sectsz=512 attr=2, projid32bit=1 = crc=0 finobt=0data = bsize=4096 blocks=1310720, imaxpct=25 = sunit=0 swidth=0 blksnaming =version 2 bsize=4096 ascii-ci=0 ftype=0log =internal log bsize=4096 blocks=2560, version=2 = sectsz=512 sunit=0 blks, lazy-count=1realtime =none extsz=4096 blocks=0, rtextents=0[root@localhost ~]# mkdir /lv2 ---->创建目录[root@localhost ~]# mount /dev/mapper/rhel-lv2 /lv2/ ---->挂载 [root@localhost ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/rhel-root 93G 15G 78G 16% /devtmpfs 904M 0 904M 0% /devtmpfs 914M 80K 914M 1% /dev/shmtmpfs 914M 8.9M 905M 1% /runtmpfs 914M 0 914M 0% /sys/fs/cgroup/dev/sda1 497M 124M 373M 25% /boot/dev/mapper/rhel-home 2.0G 33M 2.0G 2% /home/dev/mapper/rhel-lv2 5.0G 33M 5.0G 1% /lv2 扩展容量[root@localhost ~]#xfs_growfs /dev/mapper/rhel-root ---->扩展xfs分区大小，这是扩展到root根下 [root@localhost ~]#resize2fs /dev/mapper/rhel-home 7G ---->扩展ext4分区大小。