[linux] LVM原磁盘扩容（非增加磁盘）

阿里云机器，ECS运行时磁盘由300G扩容到500，重启机器生效后登录。可以看到/data目录总大小300G，/dev/vdb已经扩容到500G。

[root@HD1g-elasticsearch2 ~]# df -h
Filesystem                   Size  Used Avail Use% Mounted on
/dev/vda1                     40G  .6G   32G  % /
devtmpfs                     .9G       .9G   % /dev
tmpfs                        .9G   12K  .9G   % /dev/shm
tmpfs                        .9G  380K  .9G   % /run
tmpfs                        .9G       .9G   % /sys/fs/cgroup
/dev/mapper/vg_data-lv_data  300G  218G   83G  % /data
tmpfs                        783M       783M   % /run/user/
[root@HD1g-elasticsearch2 ~]# fdisk -l

Disk /dev/vda: 42.9 GB,  bytes,  sectors
Units = sectors of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes
Disk label type: dos
Disk identifier: 0x0008d73a

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *                     Linux

Disk /dev/vdb: 536.9 GB,  bytes,  sectors
Units = sectors of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes

Disk /dev/mapper/vg_data-lv_data: 322.1 GB,  bytes,  sectors
Units = sectors of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes

1.pvs先查看已有的pv，再resize

[root@HD1g-elasticsearch2 ~]# pvs
  PV         VG      Fmt  Attr PSize    PFree
  /dev/vdb   vg_data lvm2 a--  <.00g
[root@HD1g-elasticsearch2 ~]# pvresize /dev/vdb
  Physical volume "/dev/vdb" changed
   physical volume(s) resized /  physical volume(s) not resized
[root@HD1g-elasticsearch2 ~]# pvs
  PV         VG      Fmt  Attr PSize    PFree
  /dev/vdb   vg_data lvm2 a--  <.00g .00g

2.vg大小随pvresize而变

vgs原大小应该在pvresize之前才能看到
[root@HD1g-elasticsearch2 ~]# vgs
  VG      #PV #LV #SN Attr   VSize    VFree
  vg_data          wz--n- <.00g    

pvresize后vg自动扩容了
[root@HD1g-elasticsearch2 ~]# vgs
  VG      #PV #LV #SN Attr   VSize    VFree
  vg_data          wz--n- <.00g .00g

3.查看要扩容的lv,开始扩容

[root@HD1g-elasticsearch2 ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/vg_data/lv_data
  LV Name                lv_data
  VG Name                vg_data
  LV UUID                4Ncz4O-016I-Vh8u-vmOT-BZ7W-ARiy-fCHO4s
  LV Write Access        read/write
  LV Creation host, time HD1g-elk-elastic2, -- :: +
  LV Status              available
  # open
  LV Size                <300.00 GiB
  Current LE
  Segments
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to
  Block device           :

[root@HD1g-elasticsearch2 ~]# lvextend -l +%FREE /dev/vg_data/lv_data
  Size of logical volume vg_data/lv_data changed from <300.00 GiB ( extents) to <500.00 GiB ( extents).
  Logical volume vg_data/lv_data successfully resized.
[root@HD1g-elasticsearch2 ~]# lvs
  LV      VG      Attr       LSize    Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  lv_data vg_data -wi-ao---- <.00g

4.查看原挂载节点文件系统格式，选用命令resize挂载点大小，xfs文件系统用xfs_growfs，ext*文件系统用resize2fs

[root@HD1g-elasticsearch2 ~]# df -hT
Filesystem                  Type      Size  Used Avail Use% Mounted on
/dev/vda1                   ext4       40G  .6G   32G  % /
devtmpfs                    devtmpfs  .9G       .9G   % /dev
tmpfs                       tmpfs     .9G   12K  .9G   % /dev/shm
tmpfs                       tmpfs     .9G  380K  .9G   % /run
tmpfs                       tmpfs     .9G       .9G   % /sys/fs/cgroup
/dev/mapper/vg_data-lv_data xfs       300G  218G   83G  % /data
tmpfs                       tmpfs     783M       783M   % /run/user/
[root@HD1g-elasticsearch2 ~]# xfs_growfs /dev/vg_data/lv_data
meta-data=/dev/mapper/vg_data-lv_data isize=    agcount=, agsize= blks
         =                       sectsz=   attr=, projid32bit=
         =                       crc=        finobt= spinodes=
data     =                       bsize=   blocks=, imaxpct=
         =                       sunit=      swidth= blks
naming   =version               bsize=   ascii-ci= ftype=
log      =internal               bsize=   blocks=, version=
         =                       sectsz=   sunit= blks, lazy-count=
realtime =none                   extsz=   blocks=, rtextents=
data blocks changed from  to
[root@HD1g-elasticsearch2 ~]# df -h
Filesystem                   Size  Used Avail Use% Mounted on
/dev/vda1                     40G  .6G   32G  % /
devtmpfs                     .9G       .9G   % /dev
tmpfs                        .9G   12K  .9G   % /dev/shm
tmpfs                        .9G  380K  .9G   % /run
tmpfs                        .9G       .9G   % /sys/fs/cgroup
/dev/mapper/vg_data-lv_data  500G  218G  283G  % /data
tmpfs                        783M       783M   % /run/user/