逻辑卷管理

硬盘管理

1.热添加磁盘

#查看主机总线号
[root@loan-dbs-d-03 ~]# ls /sys/class/scsi_host/                        
host0  host1  host2
#重新扫描SCSI总线，以添加新设备
[root@loan-dbs-d-03 ~]# echo "- - -">/sys/class/scsi_host/host0/scan    
[root@loan-dbs-d-03 ~]# echo "- - -">/sys/class/scsi_host/host1/scan
[root@loan-dbs-d-03 ~]# echo "- - -">/sys/class/scsi_host/host2/scan
#查看磁盘
[root@loan-dbs-d-03 ~]# fdisk -l
​

2.逻辑卷管理

1.创建新的分区

1.fdisk 为新磁盘创建分区
[root@loan-dbs-d-03 ~]# fdisk /dev/sdb
#n 1 w

2.物理卷

1.pvcreate 创建物理卷
[root@loan-dbs-d-03 ~]# pvcreate /dev/sdb1
  Physical volume "/dev/sdb1" successfully created.
2.pvscan 查看现有的物理卷
[root@loan-dbs-d-03 ~]# pvscan
  PV /dev/sda2   VG centos          lvm2 [<19.00 GiB / 0    free]
  PV /dev/sdb1                      lvm2 [1.00 GiB]
  PV /dev/sdb2                      lvm2 [1023.00 MiB]
​

3.逻辑卷组

1.vgcreate 创建逻辑卷组
[root@loan-dbs-d-03 ~]# vgcreate lg01 /dev/sdb1
  Volume group "lg01" successfully created
  
2.vgdisplay 查看现有的逻辑卷组
[root@loan-dbs-d-03 ~]# vgdisplay
  --- Volume group ---
  VG Name               lg01
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               1020.00 MiB
  PE Size               4.00 MiB
  Total PE              255
  Alloc PE / Size       0 / 0   
  Free  PE / Size       255 / 1020.00 MiB
  VG UUID               eVNcQf-LejS-c7Iv-zJkb-GtK5-ZTZN-rjc8zy
  
3.扩展逻辑卷组
 [root@loan-dbs-d-03 ~]# vgextend lg01 /dev/sdb2
  Volume group "lg01" successfully extended
​
4.vgremov 删除卷组  #-f：强制删除
[root@localhost ~]# vgremove lg01    #删除卷组"lg01"
Volume group "lg01" successfully removed

4.逻辑卷

1.lvcreate 创建逻辑卷
 [root@loan-dbs-d-03 ~]# lvcreate -L 200M -n lv01 lg01      #-L 逻辑卷的大小，-n 逻辑卷的名字，lg01 卷组名字
  Logical volume "lv01" created.
2.lvdisplay 查看逻辑卷
[root@loan-dbs-d-03 ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/lg01/lv01
  LV Name                lv01
  VG Name                lg01
  LV UUID                xl1JyD-jNb7-3UZf-Gb6N-rD1m-ZdM8-Zke0go
  LV Write Access        read/write
  LV Creation host, time loan-dbs-d-03, 2022-07-04 05:07:08 +0800
  LV Status              available
  # open                 0
  LV Size                200.00 MiB
  Current LE             50
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:2
   
​

5.格式化逻辑卷

1.mkfs.xfs 格式化新的逻辑卷
[root@loan-dbs-d-03 ~]# mkfs.xfs /dev/lg01/lv01 
meta-data=/dev/lg01/lv01         isize=512    agcount=4, agsize=12800 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=51200, 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
​

6.挂在逻辑卷

1.mount 挂载逻辑卷
[root@loan-dbs-d-03 ~]# mount /dev/lg01/lv01 /mnt/lvm01/

7.重设逻辑卷大小

1.lvresize 重新设置逻辑卷大小
[root@loan-dbs-d-03 ~]# lvresize -L 250M /dev/lg01/lv01 
  Rounding size to boundary between physical extents: 252.00 MiB.
  Size of logical volume lg01/lv01 changed from 200.00 MiB (50 extents) to 252.00 MiB (63 extents).
  Logical volume lg01/lv01 successfully resized.
#在这里其实已经添加上了，因为我们还在挂载使用中，且我们所做的操作都是在物理上扩容，并没有在逻辑上扩容，这里我们需要更改，先看一下是什么文件系统。命令blkid
[root@loan-dbs-d-03 ~]# blkid
……
/dev/mapper/lg01-lv01: UUID="caef7d46-d5c3-4f72-aa3f-99d954a139a9" TYPE="xfs" 
​
#xfs文件系统只需要命令：xfs_growfs
[root@loan-dbs-d-03 ~]# xfs_growfs /dev/lg01/lv01 
meta-data=/dev/mapper/lg01-lv01  isize=512    agcount=4, agsize=12800 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=51200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=855, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 51200 to 64512
#再看一下磁盘大小，已经修改成250M
[root@loan-dbs-d-03 ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
……
/dev/mapper/lg01-lv01    249M   11M  239M   5% /mnt/lvm01
​
11.如果是ext4格式，就需要下面的两个命令：
​
#检查磁盘错误：e2fsck -f /dev/vg1/lv1
#更新逻辑卷信息：resize2fs /dev/vg1/lv1