记一次服务器扩盘

问题：测试服务器突然zk挂了，重新启动后根本起不了，发现报错：

查询后发现根分区爆满：

解决问题：

一、在虚拟机上增加新盘

1、增加盘后将盘分区

[root@dbmysql ~]# fdisk /dev/sda
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.

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): p

Disk /dev/sda: 214.7 GB, 214748364800 bytes, 419430400 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: 0x000c1368

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200   125829119    61864960   8e  Linux LVM

Command (m for help): n
Partition type:
   p   primary (2 primary, 0 extended, 2 free)
   e   extended
Select (default p): 3
Invalid partition type `3'

Command (m for help): n
Partition type:
   p   primary (2 primary, 0 extended, 2 free)
   e   extended
Select (default p): 
Using default response p
Partition number (3,4, default 3): 3
First sector (125829120-419430399, default 125829120): 
Using default value 125829120
Last sector, +sectors or +size{K,M,G} (125829120-419430399, default 419430399): 
Using default value 419430399
Partition 3 of type Linux and of size 140 GiB is set

Command (m for help): p

Disk /dev/sda: 214.7 GB, 214748364800 bytes, 419430400 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: 0x000c1368

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200   125829119    61864960   8e  Linux LVM
/dev/sda3       125829120   419430399   146800640   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.

问题：此时我们在/dev下查不到sd3文件

解决办法：执行[root@dbmysql ~]# partprobe

格式化盘：

[root@dbmysql ~]# mkfs.xfs /dev/sda3
meta-data=/dev/sda3              isize=512    agcount=4, agsize=9175040 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=36700160, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=17920, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

查询到了我们的盘uuid

[root@dbmysql ~]# blkid
/dev/sda1: UUID="553e6333-e548-4aa9-942d-61f1e56afc9f" TYPE="xfs" 
/dev/sda2: UUID="Z7YLpG-G8XF-lFay-Cc3i-0Z39-qPtN-vAp1lu" TYPE="LVM2_member" 
/dev/mapper/cl-root: UUID="5aca02a1-813b-4b22-b004-905273bcabf7" TYPE="xfs" 
/dev/mapper/cl-swap: UUID="bec18aee-7929-4bef-8f6e-419060bfad80" TYPE="swap" 
/dev/mapper/cl-home: UUID="a1eaa957-ed36-4eb0-9013-4af168b3a438" TYPE="xfs" 
/dev/sda3: UUID="95859c12-86cf-4c44-8408-d04847d595a2" TYPE="xfs" 

二、扩盘

1、创建物理卷

[root@dbmysql ~]# pvcreate /dev/sda3
WARNING: xfs signature detected on /dev/sda3 at offset 0. Wipe it? [y/n]: y
  Wiping xfs signature on /dev/sda3.
  Physical volume "/dev/sda3" successfully created.
2、创建卷组

查询我们要扩充盘的卷组，然后将新的分区加入到卷组

[root@dbmysql ~]# lvs
  LV   VG Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home cl -wi-ao---- 18.70g                                                    
  root cl -wi-ao---- 38.30g                                                    
  swap cl -wi-ao----  2.00g    

以上看到卷组名称是cl

[root@dbmysql ~]# vgextend cl /dev/sda3
  Couldn't create temporary archive name.

以上问题是盘空间不足导致，我在/tmp目录清理下，盘空间降下来了

[root@dbmysql tmp]# df -h
Filesystem           Size  Used Avail Use% Mounted on
/dev/mapper/cl-root   39G   37G  1.7G  96% /
devtmpfs             1.9G     0  1.9G   0% /dev
tmpfs                1.9G     0  1.9G   0% /dev/shm
tmpfs                1.9G  8.6M  1.9G   1% /run
tmpfs                1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/sda1           1014M  139M  876M  14% /boot
/dev/mapper/cl-home   19G  141M   19G   1% /home
tmpfs                378M     0  378M   0% /run/user/0
[root@dbmysql tmp]# vgextend cl /dev/sda3
  Volume group "cl" successfully extended
3、扩充到我们的逻辑卷

查询当前的Free  PE / Size的值

[root@dbmysql tmp]# vgdisplay
  --- Volume group ---
  VG Name               cl
  System ID             
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  5
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               198.99 GiB
  PE Size               4.00 MiB
  Total PE              50942
  Alloc PE / Size       15102 / 58.99 GiB
  Free  PE / Size       35840 / 140.00 GiB
  VG UUID               9pLc6R-J6Lw-iqcv-DL8v-iZa7-m9ni-rbskmb

扩盘：

[root@dbmysql ~]# lvextend -L 100G /dev/mapper/cl-root 
  Size of logical volume cl/root changed from 38.30 GiB (9804 extents) to 100.00 GiB (25600 extents).
  Logical volume cl/root successfully resized.
此时我们df查询盘情况：

[root@dbmysql ~]# df -h
Filesystem           Size  Used Avail Use% Mounted on
/dev/mapper/cl-root   39G   37G  1.7G  96% /
devtmpfs             1.9G     0  1.9G   0% /dev
tmpfs                1.9G     0  1.9G   0% /dev/shm
tmpfs                1.9G  8.6M  1.9G   1% /run
tmpfs                1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/sda1           1014M  139M  876M  14% /boot
/dev/mapper/cl-home   19G  141M   19G   1% /home
tmpfs                378M     0  378M   0% /run/user/0
发现盘还没有显示：

刷新显示，常用的命令刷新报错：因我们的系统既不是ext3也不是ext4，

[root@dbmysql ~]# resize2fs /dev/mapper/cl-root 
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/mapper/cl-root
Couldn't find valid filesystem superblock.

解决办法：

[root@dbmysql ~]# xfs_growfs  /dev/mapper/cl-root 
meta-data=/dev/mapper/cl-root    isize=512    agcount=4, agsize=2509824 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=10039296, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=4902, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 10039296 to 26214400

再一次查询发现盘已更新了

[root@dbmysql ~]# df -h
Filesystem           Size  Used Avail Use% Mounted on
/dev/mapper/cl-root  100G   38G   63G  38% /
devtmpfs             1.9G     0  1.9G   0% /dev
tmpfs                1.9G     0  1.9G   0% /dev/shm
tmpfs                1.9G  8.6M  1.9G   1% /run
tmpfs                1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/sda1           1014M  139M  876M  14% /boot
/dev/mapper/cl-home   19G  141M   19G   1% /home
tmpfs                378M     0  378M   0% /run/user/0