基於system Center 2012–VMM(virtral machine manager)在線擴容Centos硬盤。

計劃使用zabbix監控管理全單位的PC的基本硬件信息,因爲開始的規劃的硬盤比較小，擔憂監控時磁盤不夠。

在些先考慮能過LVM增容zabbix的數據庫存儲空間。

System Center 2012–VMM(virtral machine manager)-簡稱爲：VMM

1.打開VMM管理臺，找到增容的設備-右鍵屬性-硬件配置-磁盤（增長）自定義須要增長的容量後，點擊：確認

2.SSH鏈接Centos虛擬機器，查看新增硬盤設備

[root@localhost ~]# dmesg | grep 「sd 1」

sd 1:0:0:0: Attached scsi generic sg1 type 0
sd 1:0:0:0: [sdb] 167772160 512-byte logical blocks: (85.8 GB/80.0 GiB)
sd 1:0:0:0: [sdb] Write Protect is off
sd 1:0:0:0: [sdb] Mode Sense: 0f 00 10 00
sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, supports DPO and FUA
sdb: unknown partition table
sd 1:0:0:0: [sdb] Attached SCSI disk

已經在線增長硬盤完成。那麼下面開始擴容LVM

3.開始建立分區

[root@localhost ~]# fdisk /dev/sdb 
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x5ebe1b5d.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): n  #建立分區
Command action
   e   extended
   p   primary partition (1-4)
p  #主分區
Partition number (1-4): 1  #主分區爲第一主分區
First cylinder (1-10443, default 1): 1  #磁盤的起始位置
Last cylinder, +cylinders or +size{K,M,G} (1-10443, default 10443):   #默認所有都
Using default value 10443

Command (m for help): p     #查看建立的分區

Disk /dev/sdb: 85.9 GB, 85899345920 bytes
255 heads, 63 sectors/track, 10443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x5ebe1b5d

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       10443    83882373+  83  Linux    #須要修改分區類型到LVM 
修改分區類型：使用t 選項

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)

查看一下分區類型並保存退出。

Command (m for help): p

Disk /dev/sdb: 85.9 GB, 85899345920 bytes
255 heads, 63 sectors/track, 10443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0d3c2108

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       10443    83883366   8e  Linux LVM

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

建立PV並查看PV，使用命令：pvcreate 與 pvdisplay

[root@localhost ~]# pvcreate /dev/sdb1
  dev_is_mpath: failed to get device for 8:17
  Physical volume "/dev/sdb1" successfully created
[root@localhost ~]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               VolGroup
  PV Size               19.51 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              4994
  Free PE               0
  Allocated PE          4994
  PV UUID               qOY1yW-Ynm7-2d1g-2nMH-G6nN-evtl-Cjp02F
  
  "/dev/sdb1" is a new physical volume of "80.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb1
  VG Name              
  PV Size               80.00 GiB
  Allocatable           NO
  PE Size               0  
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               Um4a9O-gFHb-Gg70-2gxB-v50x-mmuZ-XyYymh
  
擴展新硬盤到VG組中

[root@localhost ~]# vgextend VolGroup /dev/sdb1
  Volume group "VolGroup" successfully extended
[root@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name               VolGroup
  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               99.50 GiB
  PE Size               4.00 MiB
  Total PE              25473
  Alloc PE / Size       4994 / 19.51 GiB
  Free  PE / Size       20479 / 80.00 GiB
  VG UUID               iprcvl-yS2E-Z9t0-diqk-LaNC-rXqX-1Rd9VI

增容到LV中

[root@localhost ~]# lvextend -L +80G /dev/VolGroup/lv_root
  Extending logical volume lv_root to 97.57 GiB
  Insufficient free space: 20480 extents needed, but only 20479 available #報錯 告訴我可用的容量爲20479

[root@localhost ~]# lvextend -L +79G /dev/VolGroup/lv_root  
  Extending logical volume lv_root to 96.57 GiB
  Logical volume lv_root successfully resized
查看了一下LV容量

[root@localhost ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/VolGroup/lv_root
  LV Name                lv_root
  VG Name                VolGroup
  LV UUID                BJWEPf-lBb5-2hqB-om6A-UP31-mPI0-qPRxWZ
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2015-05-29 23:23:23 +0800
  LV Status              available
  # open                 1
  LV Size                96.57 GiB   #成功增容
  Current LE             24722
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

更新文件系統

resize2fs -f /dev/VolGroup/lv_root

-f 強制
[root@localhost ~]# resize2fs -f /dev/VolGroup/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 7
Performing an on-line resize of /dev/VolGroup/lv_root to 25315328 (4k) blocks.
The filesystem on /dev/VolGroup/lv_root is now 25315328 blocks long.
df 查看一下增容的文件系統

[root@localhost ~]# df -h Filesystem                    Size  Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root   96G  8.8G   82G  10% / [root@localhost ~]#