lvm 扩容

总体思路：

逻辑卷要扩容，先扩容对应卷组，

扩容卷组的方式：

1. 添加新的物理卷(磁盘已有分区，扩容后新建分区；或者新加了一块硬盘创建了新的物理卷)，vgextend myvg /dev/vdb 扩容，/dev/vdb为示例新加了一块硬盘直接做的物理卷。
2. 物理卷自身扩容(原有未分区已做物理卷的虚拟硬盘扩容，或者做物理卷的分区扩容）。直接pvresize刷新物理卷大小即可。

示例场景1：

/dev/vdc 由25G扩容到35G

[root@vm10-20-88-88 ~]# lsblk
NAME             MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vda              253:0    0  20G  0 disk
└─vda1           253:1    0  20G  0 part /
vdb              253:16   0  50G  0 disk
vdc              253:32   0  35G  0 disk
└─vdc1           253:33   0  25G  0 part
  └─myvg-mylv--1 252:0    0  59G  0 lvm  /disk1
vdd              253:48   0  25G  0 disk
└─vdd1           253:49   0  25G  0 part
  └─myvg-mylv--1 252:0    0  59G  0 lvm  /disk1
vde              253:64   0  25G  0 disk
└─vde1           253:65   0  25G  0 part
  └─myvg-mylv--1 252:0    0  59G  0 lvm  /disk1
[root@vm10-20-88-88 ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree
  /dev/vdb   myvg lvm2 a--  <50.00g <50.00g
  /dev/vdc1  myvg lvm2 a--  <25.00g      0
  /dev/vdd1  myvg lvm2 a--  <25.00g      0
  /dev/vde1  myvg lvm2 a--  <25.00g <15.99g
[root@vm10-20-88-88 ~]# 

使用parted扩容分区方式

resizepart

[root@vm10-20-88-88 ~]# parted /dev/vdc
GNU Parted 3.1
Using /dev/vdc
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Error: The backup GPT table is not at the end of the disk, as it should be.  This might mean that another operating system believes the disk is smaller.  Fix, by moving the backup to the end
(and removing the old backup)?

备份GPT表没有像应该的那样位于磁盘的末尾。这可能意味着另一个操作系统认为磁盘更小。解决办法是把备份移到最后

(并删除旧的备份)?

Fix/Ignore/Cancel? f
Warning: Not all of the space available to /dev/vdc appears to be used, you can fix the GPT to use all of the space (an extra 20971520 blocks) or continue with the current setting?
Fix/Ignore? f    
不是所有可用的空间/dev/vdc似乎被使用，您可以修复GPT使用所有空间(一个额外的20971520块)或继续当前设置?

Model: Virtio Block Device (virtblk)
Disk /dev/vdc: 37.6GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
 1      1049kB  26.8GB  26.8GB

(parted) print
Model: Virtio Block Device (virtblk)
Disk /dev/vdc: 37.6GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
 1      1049kB  26.8GB  26.8GB

(parted)resizepart 1 37.6GB   # 此步骤扩容了1分区
(parted) print
Model: Virtio Block Device (virtblk)
Disk /dev/vdc: 37.6GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
 1      1049kB  37.6GB  37.6GB

(parted)                      

然后pvresize扩容物理卷，卷组自动扩容

[root@vm10-20-88-88 ~]# pvresize /dev/vdc1
  Physical volume "/dev/vdc1" changed
  1 physical volume(s) resized or updated / 0 physical volume(s) not resized
[root@vm10-20-88-88 ~]# vgs
  VG   #PV #LV #SN Attr   VSize   VFree
  myvg   4   1   0 wz--n- 134.98g 75.98g
[root@vm10-20-88-88 ~]# 

或者新建一个分区新建物理卷，向卷组新加物理卷

vgextend myvg <新物理卷>

详细示例省略

示例场景2：

/dev/vdb磁盘未做分区，直接做了物理卷

物理卷扩容前25G

[root@vm10-20-88-88 ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree
  /dev/vdb   myvg lvm2 a--  <25.00g <25.00g
  /dev/vdc1  myvg lvm2 a--  <25.00g      0
  /dev/vdd1  myvg lvm2 a--  <25.00g      0
  /dev/vde1  myvg lvm2 a--  <25.00g <15.99g

虚拟机磁盘扩容....到50G

pvresize扩容物理卷

[root@vm10-20-88-88 ~]# pvresize /dev/vdb
  Physical volume "/dev/vdb" changed
  1 physical volume(s) resized or updated / 0 physical volume(s) not resized
[root@vm10-20-88-88 ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree
  /dev/vdb   myvg lvm2 a--  <50.00g <50.00g
  /dev/vdc1  myvg lvm2 a--  <25.00g      0
  /dev/vdd1  myvg lvm2 a--  <25.00g      0
  /dev/vde1  myvg lvm2 a--  <25.00g <15.99g

vgs查看卷组大小已扩容

[root@vm10-20-88-88 ~]# vgs
  VG   #PV #LV #SN Attr   VSize   VFree
  myvg   4   1   0 wz--n- 124.98g 65.98g
[root@vm10-20-88-88 ~]#