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扩展分区

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扩展分区

我有一台 CentOS 机器，有 1 个硬盘，分区如下：

[root@localhost var]# fdisk -l

Disk /dev/sda: 214.7 GB, 214748364800 bytes
255 heads, 63 sectors/track, 26108 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          19      152586   83  Linux
/dev/sda2              20         280     2096482+  82  Linux swap / Solaris
/dev/sda3             281        2610    18715725   8e  Linux LVM
[root@localhost var]# vgs
  VG      #PV #LV #SN Attr   VSize  VFree
  vg_root   1   3   0 wz--n- 17.84G    0
[root@localhost var]# pvs
  PV         VG      Fmt  Attr PSize  PFree
  /dev/sda3  vg_root lvm2 a--  17.84G    0
[root@localhost var]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg_root/lv_root
  VG Name                vg_root
  LV UUID                YFfzh2-03mH-zrHa-INJn-iqxZ-vYpo-XDyimP
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                8.91 GB
  Current LE             285
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/vg_root/lv_var_lib_mysql
  VG Name                vg_root
  LV UUID                xdoJuc-21WP-99ZW-5aOE-bINc-fgYF-qP50vw
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                5.94 GB
  Current LE             190
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

  --- Logical volume ---
  LV Name                /dev/vg_root/lv_zenoss_perf
  VG Name                vg_root
  LV UUID                ByUzF7-wYab-R9q5-3h4o-S3AI-L0HH-2Kn07p
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                3.00 GB
  Current LE             96
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

/dev/sda 显示总大小为 214.7GB。如何将每个逻辑卷的大小扩展 20GB？

谢谢你，

答案1

我用来fdisk /dev/sda创建一个新分区sda4

[root@localhost ~]# fdisk /dev/sda

The number of cylinders for this disk is set to 26108.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

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
   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): n
Command action
   e   extended
   p   primary partition (1-4)
p
Selected partition 4
First cylinder (2611-26108, default 2611): 2611
Last cylinder or +size or +sizeM or +sizeK (2611-26108, default 26108): 26108

Command (m for help): t
Partition number (1-4): 3
Hex code (type L to list codes): 8e

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.
Syncing disks.
[root@localhost ~]# fdisk /dev/sda -l

Disk /dev/sda: 214.7 GB, 214748364800 bytes
255 heads, 63 sectors/track, 26108 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          19      152586   83  Linux
/dev/sda2              20         280     2096482+  82  Linux swap / Solaris
/dev/sda3             281        2610    18715725   8e  Linux LVM
/dev/sda4            2611       26108   188747685   83  Linux

然后重启机器

然后我使用commandpvcreate /dev/sda4创建物理卷sda4。然后，我通过发出命令来扩展 vg_root（虚拟组）以覆盖 sda4 vgextend vg_root /dev/sda4。然后我使用命令lvextend并resize2fs根据需要扩展逻辑卷的大小。

感谢@derobert 的帮助。

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