虛擬機(jī)磁盤邏輯卷如何擴(kuò)容
在esx server上安裝虛擬機(jī)時(shí),由于只分配了默認(rèn)的8GB磁盤空間??臻g不太夠,所以在虛擬機(jī)上把分配磁盤空間擴(kuò)大的20GB。在esx server上擴(kuò)容磁盤空間的方法很簡(jiǎn)單,在此不提,下面具體說(shuō)說(shuō)如何把該擴(kuò)容的磁盤空間在虛擬機(jī)上應(yīng)用上去。
以下是未擴(kuò)容前的狀態(tài):
- [root@localhost ~]# fdisk -l
 - Disk /dev/sda: 21.4 GB, 21474836480 bytes
 - 255 heads, 63 sectors/track, 2610 cylinders
 - Units = cylinders of 16065 * 512 = 8225280 bytes
 - Device Boot Start End Blocks Id System
 - /dev/sda1 * 1 13 104391 83 Linux
 - /dev/sda2 14 1044 8281507+ 8e Linux LVM
 - [root@localhost ~]# df -h
 - Filesystem Size Used Avail Use% Mounted on
 - /dev/mapper/VolGroup-LogVol00
 - 7.0G 4.8G 1.8G 73% /
 - /dev/sda1 99M 12M 82M 13% /boot
 - tmpfs 187M 0 187M 0% /dev/shm
 - /dev/hdc 183M 183M 0 100% /media/VMware Tools
 
可以看到sda有21.4GB,但是只利用了sda1和sda2;根目錄掛載在/dev/mapper/VolGroup-LogVol00,我們要做的是,把sda上剩余的空間擴(kuò)容到/dev/mapper/VolGroup-LogVol00。
1)首先,通過(guò)fdisk /dev/sda命令將sda剩余空間創(chuàng)建一個(gè)分區(qū):
- [root@localhost ~]# fdisk /dev/sda
 - The number of cylinders for this disk is set to 2610.
 - 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
 - Partition number (1-4): 3
 - First cylinder (1045-2610, default 1045):
 - Using default value 1045
 - Last cylinder or +size or +sizeM or +sizeK (1045-2610, default 2610):
 - Using default value 2610
 - 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 ~]#
 
此時(shí)可以看到多了一個(gè)sda3的分區(qū):
- [root@localhost ~]# fdisk -l
 - Disk /dev/sda: 21.4 GB, 21474836480 bytes
 - 255 heads, 63 sectors/track, 2610 cylinders
 - Units = cylinders of 16065 * 512 = 8225280 bytes
 - Device Boot Start End Blocks Id System
 - /dev/sda1 * 1 13 104391 83 Linux
 - /dev/sda2 14 1044 8281507+ 8e Linux LVM
 - /dev/sda3 1045 2610 12578895 83 Linux
 
此時(shí)查看了一下/dev下,不知道為何沒有/dev/sda3,于是重啟了一下虛擬機(jī)RHEL,重啟完成后,出現(xiàn)了/dev/sda3.
一開始在這個(gè)地方折騰了一會(huì),如果不重啟,在利用命令pvcreate /dev/sda3創(chuàng)建pv時(shí),總是提示Device /dev/sda3 not found (or ignored by filtering).
重啟完成后,進(jìn)入lvm模式,創(chuàng)建pv:
- lvm> pvcreate /dev/sda3
 - Physical volume "/dev/sda3" successfully created
 
擴(kuò)容vg:vgextend vg_gcc /dev/sda3
- lvm> vgextend VolGroup /dev/sda3
 - /dev/cdrom: open failed: Read-only file system
 - Attempt to close device '/dev/cdrom' which is not open.
 - Volume group "VolGroup" successfully extended
 
把lv擴(kuò)容到vg的剩余容量:lvextend /dev/vg_gcc/lv_root /dev/sda3
- lvm> lvextend /dev/VolGroup/LogVol00 /dev/sda3
 - Extending logical volume LogVol01 to 12.72 GB
 - Logical volume LogVol01 successfully resized
 
***,通過(guò)resize2fs命令令新增的空間在線(on-line)生效:resize2fs /dev/vg_gcc/lv_root
- [root@localhost dev]# resize2fs /dev/VolGroup/LogVol00
 - resize2fs 1.39 (29-May-2006)
 - Filesystem at /dev/VolGroup/LogVol00 is mounted on /; on-line resizing required
 - Performing an on-line resize of /dev/VolGroup/LogVol00 to 5005312 (4k) blocks.
 - The filesystem on /dev/VolGroup/LogVol00 is now 5005312 blocks long.
 
效果如下:
- [root@localhost dev]# df -h
 - Filesystem Size Used Avail Use% Mounted on
 - /dev/mapper/VolGroup-LogVol00
 - 19G 4.8G 13G 28% /
 - /dev/sda1 99M 12M 82M 13% /boot
 - tmpfs 187M 0 187M 0% /dev/shm
 - /dev/hdc 3.4G 3.4G 0 100% /media/RHEL_5.2 x86_64 DVD
 
至此,擴(kuò)容已成功完成。
















 
 
 

 
 
 
 