linux扩容（根分区与普通分区）

根分区

[root@localhost ~]# cd /sys/class/scsi_host
[root@localhost scsi_host]# ls
host0 host1 host2
[root@localhost scsi_host]# echo "- - -" > /sys/class/scsi_host/host0/scan
[root@localhost scsi_host]# echo "- - -" > /sys/class/scsi_host/host1/scan
[root@localhost scsi_host]# echo "- - -" > /sys/class/scsi_host/host2/scan

找到新加的盘 /dev/sdg

[root@localhost scsi_host]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda3 rootvg lvm2 a-- 291.88G 0
/dev/sdb rootvg lvm2 a-- 299.97G 0
/dev/sdd rootvg lvm2 a-- 303.97G 0
/dev/sde1 rootvg lvm2 a-- 500.97G 0
/dev/sdf1 rootvg lvm2 a-- 501.97G 0

[root@localhost scsi_host]# vgs
VG #PV #LV #SN Attr VSize VFree
rootvg 5 1 0 wz--n- 1.85T 0

[root@localhost scsi_host]# df -Th
文件系统类型容量已用可用已用% 挂载点
/dev/mapper/rootvg-rootlv01
ext3 1.8T 1.5T 215G 88% /
/dev/sda1 ext3 190M 25M 156M 14% /boot
tmpfs tmpfs 7.9G 4.7G 3.3G 59% /dev/shm

[root@localhost scsi_host]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
rootlv01 rootvg -wi-ao 1.85T
[root@localhost scsi_host]# fdisk /dev/sdg
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
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)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-26108, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-26108, default 26108):
Using default value 26108

Command (m for help): p

Disk /dev/sdg: 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/sdg1 1 26108 209712478+ 83 Linux

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)

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

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

[root@localhost scsi_host]# fdisk -l /dev/sdg

Disk /dev/sdg: 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/sdg1 1 26108 209712478+ 8e Linux LVM

[root@localhost scsi_host]# pvcreate /dev/sdg1
Writing physical volume data to disk "/dev/sdg1"
Physical volume "/dev/sdg1" successfully created

[root@localhost scsi_host]# vgextend rootvg /dev/sdg1
Volume group "rootvg" successfully extended

[root@localhost scsi_host]# vgs
VG #PV #LV #SN Attr VSize VFree
rootvg 6 1 0 wz--n- 2.05T 199.97G

[root@localhost scsi_host]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
rootlv01 rootvg -wi-ao 1.85T

[root@localhost scsi_host]# lvextend -L +200G /dev/rootvg/rootlv01 （/dev/VG名/LV名）
Extending logical volume rootlv01 to 2.05 TB
Insufficient free space: 6400 extents needed, but only 6399 available

[root@localhost scsi_host]# lvextend -l +6399 /dev/rootvg/rootlv01
Extending logical volume rootlv01 to 2.05 TB
Logical volume rootlv01 successfully resized

[root@localhost scsi_host]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
rootlv01 rootvg -wi-ao 2.05T

[root@localhost scsi_host]# resize2fs /dev/rootvg/rootlv01
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/rootvg/rootlv01 is mounted on /; on-line resizing required
hyPerforming an on-line resize of /dev/rootvg/rootlv01 to 550166528 (4k) blocks.
hyThe filesystem on /dev/rootvg/rootlv01 is now 550166528 blocks long.

[root@localhost scsi_host]# df -Th
文件系统类型容量已用可用已用% 挂载点
/dev/mapper/rootvg-rootlv01
ext3 2.0T 1.5T 399G 80% /
/dev/sda1 ext3 190M 25M 156M 14% /boot
tmpfs tmpfs 7.9G 4.7G 3.3G 59% /dev/shm

-----------------------------------------------------------------------------------------------------------

普通分区

在线扫磁盘

[root@localhost-in ~]# echo "- - -" > /sys/class/scsi_host/host0/scan
[root@localhost-in ~]# echo "- - -" > /sys/class/scsi_host/host1/scan
[root@localhost-in ~]# echo "- - -" > /sys/class/scsi_host/host2/scan

fdisk -l 找到新加盘为/dev/sdh

[root@localhost-in ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda3 rootvg lvm2 a-- 291.88G 0
/dev/sdb vg_data lvm2 a-- 300.00G 0
/dev/sdd vg_data lvm2 a-- 304.00G 0
/dev/sde1 vg_data lvm2 a-- 499.99G 0
/dev/sdf1 rootvg lvm2 a-- 100.97G 0
/dev/sdg1 vg_data lvm2 a-- 501.99G 0

[root@localhost-in ~]# fdisk /dev/sdh
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
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)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): p

Disk /dev/sdh: 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/sdh1 1 26108 209712478+ 83 Linux

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)

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

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

[root@localhost-in ~]# pvcreate /dev/sdh1
Writing physical volume data to disk "/dev/sdh1"
Physical volume "/dev/sdh1" successfully created

[root@localhost-in ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rootvg 2 1 0 wz--n- 392.84G 0
vg_data 4 1 0 wz--n- 1.57T 0

[root@localhost-in ~]# df -Th
文件系统类型容量已用可用已用% 挂载点
/dev/mapper/rootvg-rootlv01
ext3 381G 250G 112G 70% /
/dev/sda1 ext3 190M 25M 156M 14% /boot
tmpfs tmpfs 7.9G 4.9G 3.0G 62% /dev/shm
/dev/mapper/vg_data-lv_data
ext4 1.6T 1.3T 252G 84% /data
/dev/sr0 iso9660 2.8G 2.8G 0 100% /mnt/cdrom

[root@localhost-in ~]# vgextend vg_data /dev/sdh1
Volume group "vg_data" successfully extended

[root@localhost-in ~]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
rootlv01 rootvg -wi-ao 392.84G
lv_data vg_data -wi-ao 1.57T

[root@localhost-in ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rootvg 2 1 0 wz--n- 392.84G 0
vg_data 5 1 0 wz--n- 1.76T 200.00G

[root@localhost-in ~]# lvextend -l +6399 /dev/vg_data/lv_data
Extending logical volume lv_data to 1.59 TB
Logical volume lv_data successfully resized

[root@localhost-in ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rootvg 2 1 0 wz--n- 392.84G 0
vg_data 5 1 0 wz--n- 1.76T 175.00G

[root@localhost-in ~]# lvextend -L +175G /dev/vg_data/lv_data
Extending logical volume lv_data to 1.76 TB
Logical volume lv_data successfully resized

[root@localhost-in ~]# vgs
VG #PV #LV #SN Attr VSize VFree
rootvg 2 1 0 wz--n- 392.84G 0
vg_data 5 1 0 wz--n- 1.76T 0

[root@localhost-in ~]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
rootlv01 rootvg -wi-ao 392.84G
lv_data vg_data -wi-ao 1.76T

[root@localhost-in ~]# resize2fs /dev/vg_data/lv_data
resize2fs 1.39 (29-May-2006)
resize2fs: Filesystem has unsupported feature(s) while trying to open /dev/vg_data/lv_data
Couldn't find valid filesystem superblock.

[root@localhost-in ~]# resize4fs /dev/vg_data/lv_data
resize4fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg_data/lv_data is mounted on /data; on-line resizing required
old desc_blocks = 101, new_desc_blocks = 113

linux扩容（根分区 与 普通分区）

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