2006隨手札記

LAB

%add a new partion and set to LVM

1. create LVM (partition type: 8e)

[root@server1 ~]# pvcreate /dev/sdb8
Physical volume "/dev/sdb8" successfully created

[root@server1 ~]# vgcreate vg0 /dev/sdb8
Volume group "vg0" successfully created

[root@server1 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
VolGroup00 1 2 0 wz--n- 74.41G 0
vg0 1 0 0 wz--n- 96.00M 96.00M

[root@server1 ~]# lvcreate -L 96M -n data vg0
Logical volume "data" created

2. extend LVM (partition type:8e)

[root@server1 ~]# pvcreate /dev/sdb9
Physical volume "/dev/sdb9" successfully created

[root@server1 ~]# vgextend vg0 /dev/sdb9
Volume group "vg0" successfully extended

[root@server1 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
VolGroup00 1 2 0 wz--n- 74.41G 0
vg0 2 1 0 wz--n- 192.00M 96.00M

[root@server1 ~]# lvextend -L +96M /dev/vg0/data
Extending logical volume data to 192.00 MB
Logical volume data successfully resized

#resize2fs -p /dev/vg0/data
#df -h

[root@server1 ~]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
LogVol00 VolGroup00 -wi-ao 72.47G
LogVol01 VolGroup00 -wi-ao 1.94G
data vg0 -wi-a- 192.00M

[root@server1 ~]# mkfs.ext3 /dev/vg0/data
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
49152 inodes, 196608 blocks
9830 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67371008
24 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729

Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 29 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.


3. reduce LVM (注意, 須先備份, 預防資料遺失)

[root@server1 ~]# fsck -f /dev/vg0/data
fsck 1.39 (29-May-2006)
e2fsck 1.39 (29-May-2006)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/vg0/data: 11/49152 files (9.1% non-contiguous), 11869/196608 blocks
You have new mail in /var/spool/mail/root

[root@server1 ~]# resize2fs /dev/vg0/data 92M
resize2fs 1.39 (29-May-2006)
Resizing the filesystem on /dev/vg0/data to 94208 (1k) blocks.
The filesystem on /dev/vg0/data is now 94208 blocks long.

[root@server1 ~]# lvreduce /dev/vg0/data -L 92M
WARNING: Reducing active logical volume to 92.00 MB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce data? [y/n]: y
Reducing logical volume data to 92.00 MB
Logical volume data successfully resized

[root@server1 ~]# pvmove /dev/sdb8
/dev/sdb8: Moved: 34.8%
/dev/sdb8: Moved: 69.6%
/dev/sdb8: Moved: 100.0%

[root@server1 ~]# vgreduce vg0 /dev/sdb8
Removed "/dev/sdb8" from volume group "vg0"

[root@server1 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 VolGroup00 lvm2 a- 74.41G 0
/dev/sdb8 lvm2 -- 97.81M 97.81M
/dev/sdb9 vg0 lvm2 a- 96.00M 4.00M

[root@server1 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
VolGroup00 1 2 0 wz--n- 74.41G 0
vg0 1 1 0 wz--n- 96.00M 4.00M

[root@server1 ~]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
LogVol00 VolGroup00 -wi-ao 72.47G
LogVol01 VolGroup00 -wi-ao 1.94G
data vg0 -wi-a- 92.00M