centos LVM扩容

#创建物理卷，将新增磁盘加入到物理卷。
[root@Template ~]# pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created


##查看物理卷。
[root@Template ~]# pvs
  PV         VG          Fmt  Attr PSize  PFree 
  /dev/sda2  vg_template lvm2 a--u 39.51g     0 
  /dev/sdb               lvm2 ---- 20.00g 20.00g

##查看物理卷信息。
[root@Template ~]# pvdisplay 
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               vg_template
  PV Size               39.51 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              10114
  Free PE               0
  Allocated PE          10114
  PV UUID               A6Ai9a-LdqF-GbCn-p0DF-3V3X-j3h1-KfvlI4
   
  "/dev/sdb" is a new physical volume of "20.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb
  VG Name               
  PV Size               20.00 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               sxgFvu-x0au-8CxD-g6I6-yCJe-M9gg-Ax2jiu


##扩展卷组vg_template，即将PV加入卷组（VG）。
[root@Template ~]# vgextend vg_template /dev/sdb
  Volume group "vg_template" successfully extended



###先查看vg信息，然后将原/dev/vg_template/lv_root 逻辑卷的大小增加。
[root@Template ~]# vgdisplay 
  --- Volume group ---
  VG Name               vg_template
  System ID             
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               59.50 GiB
  PE Size               4.00 MiB
  Total PE              15233
  Alloc PE / Size       10114 / 39.51 GiB
  Free  PE / Size       5119 / 20.00 GiB
  VG UUID               p5VnUJ-vdh9-7ffb-guxI-97sR-GnzU-rwzyc4


###运行扩容命令，对/dev/vg_template/lv_root逻辑卷进行扩容（可能是虚拟机的问题，+20GB提示空间超了）。
[root@Template vg_template]# lvextend -l +100%FREE /dev/mapper/vg_template-lv_root


###然后运行resize2fs命令 对容量重新扩容。
[root@Template vg_template]# resize2fs /dev/mapper/vg_template-lv_root


####xfs格式的分区用xfs_growfs 命令对容量重新扩容。
[root@sz_012 ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=28311552 blks
         =                       sectsz=4096  attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=113246208, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=55296, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 113246208 to 932805632


##查看空间是否增大。
[root@Template vg_template]# df -TH

  
    

########异常问题处理：

1：pvcreate
[root@sz_012 ~]# pvcreate /dev/sda
  Device /dev/sda excluded by a filter.
[root@sz_012 ~]# parted /dev/sda
GNU Parted 3.1
Using /dev/sda
Welcome to GNU Parted! Type ‘help‘ to view a list of commands.
(parted) p
Model: LSI MR9270-8i (scsi)
Disk /dev/sda: 3357GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags

###处理方法：
[root@sz_012 ~]# parted /dev/sda
GNU Parted 3.1
Using /dev/sda
Welcome to GNU Parted! Type ‘help‘ to view a list of commands.
(parted) mklabel loop
Warning: The existing disk label on /dev/sda will be destroyed and all data on this disk will be lost. Do you want to continue?
Yes/No? yes
(parted) p
Model: LSI MR9270-8i (scsi)
Disk /dev/sda: 3357GB
Sector size (logical/physical): 512B/4096B
Partition Table: loop