linux系统VPS扩展硬盘的方法是什么
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[root@cloud ~]# df -hal查看扩容后磁盘情况。
文件系统 容量 已用 可用 已用%% 挂载点
/dev/mapper/vg_cloud-lv_root
7.5G 7.5G 0 100% /
proc 0 0 0 - /proc
sysfs 0 0 0 - /sys
devpts 0 0 0 - /dev/pts
tmpfs 494M 0 494M 0% /dev/shm
/dev/sda1 485M 33M 427M 8% /boot
none 0 0 0 - /proc/sys/fs/binfmt_misc
sunrpc 0 0 0 - /var/lib/nfs/rpc_pipefs
[root@cloud wwwroot]# fdisk -l查看分区情况。这里看到/dev/sdc为刚才加上的没有分区的盘。
Disk /dev/sda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 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: 0x00051f5f
Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 1306 9972736 8e Linux LVM
Disk /dev/sdb: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 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: 0x00000000
Disk /dev/mapper/vg_cloud-lv_root: 8128 MB, 8128561152 bytes
255 heads, 63 sectors/track, 988 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: 0x00000000
Disk /dev/mapper/vg_cloud-lv_swap: 2080 MB, 2080374784 bytes
255 heads, 63 sectors/track, 252 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: 0x00000000
[root@cloud ~]# fdisk /dev/sdb进行分区。fdisk进行硬盘分区从实质上说就是对硬盘的一种格式化。
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklable
Building a new DOS disklabel with disk identifier 0x3c59d1a9.
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 #新建分区
Command action
e extended
p primary partition (1-4)
p #设置为主分区
Partition number (1-4): 1 #主分区号
First cylinder (1-2610, default 1):1 #开始扇区（直接默认回车）
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610):2610
Using default value 2610 #结束扇区（直接默认回车）
Command (m for help): t #指定分区类型
Selected partition 1 #选择1号分区
Hex code (type L to list codes): 8e #8e为LVM
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): w #保存
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@cloud ~]# reboot
======================================================
重启中
======================================================
[root@cloud ~]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_cloud 1 2 0 wz--n- 9.51g 0
[root@cloud ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created
[root@cloud ~]# vgextend vg_cloud /dev/sdb1
Volume group "vg_cloud" successfully extended
[root@cloud ~]# vgdisplay
--- Volume group ---
VG Name vg_cloud
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 2434 / 9.51 GiB
Free PE / Size 12799 / 50.00 GiB
VG UUID I5k6GO-mjni-7dO0-O4TF-RUxH-RNcI-bnWFY3
[root@cloud ~]# lvresize -L +49.900G /dev/vg_cloud/lv_root
Rounding size to boundary between physical extents: 49.90 GiB
Extending logical volume lv_root to 57.47 GiB
Logical volume lv_root successfully resized
[root@cloud ~]# resize2fs /dev/vg_cloud/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg_cloud/lv_root is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 4
Performing an on-line resize of /dev/vg_cloud/lv_root to 15066112 (4k) blocks.
The filesystem on /dev/vg_cloud/lv_root is now 15066112 blocks long.
[root@cloud ~]# df -hal
文件系统 容量 已用 可用 已用%% 挂载点
/dev/mapper/vg_cloud-lv_root
57G 7.5G 47G 14% /
proc 0 0 0 - /proc
sysfs 0 0 0 - /sys
devpts 0 0 0 - /dev/pts
tmpfs 494M 0 494M 0% /dev/shm
/dev/sda1 485M 33M 427M 8% /boot
none 0 0 0 - /proc/sys/fs/binfmt_misc
sunrpc 0 0 0 - /var/lib/nfs/rpc_pipefs
======================================================
扩展成功
======================================================
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