2016.5.21

pv,vg,lv
[root@iphone dev]# rpm -qa | grep lvm
lvm2-2.02.98-9.el6.x86_64
lvm2-libs-2.02.98-9.el6.x86_64

1.pvcreate --physical volume create
[root@iphone dev]# pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created
[root@iphone dev]# pvcreate /dev/sdc
Physical volume "/dev/sdc" successfully created
[root@iphone dev]# pvcreate /dev/sdd
Physical volume "/dev/sdd" successfully created

2.vgcreate --vg create
[root@iphone dev]# vgcreate vg00 /dev/sdb /dev/sdc
Volume group "vg00" successfully created

[root@iphone dev]# vgdisplay -v vg00
    Using volume group(s) on command line
    Finding volume group "vg00"
--- Volume group ---
VG Name               vg00
System ID
Format                lvm2
Metadata Areas        2
Metadata Sequence No 1
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                0
Open LV               0
Max PV                0
Cur PV                2
Act PV                2
VG Size               15.99 GiB
PE Size               4.00 MiB
Total PE              4094
Alloc PE / Size       0 / 0
Free PE / Size       4094 / 15.99 GiB
VG UUID               Ui6Kbe-yuAV-KxTB-rIwc-BqQo-0nag-AvNfRF

--- Physical volumes ---
PV Name               /dev/sdb
PV UUID               B2K17I-fed9-sOCq-rbbK-r9EJ-4bdQ-V392a8
PV Status             allocatable
Total PE / Free PE    2047 / 2047

PV Name               /dev/sdc
PV UUID               rPIiBP-8NRC-JzCH-4ghf-2Ef1-SZtV-P1mOo5
PV Status             allocatable
Total PE / Free PE    2047 / 2047

[root@iphone dev]# pv
pvchange   pvck       pvcreate   pvdisplay pvmove     pvremove   pvresize   pvs        pvscan     pv.sh
[root@iphone dev]# pvscan
PV /dev/sdb    VG vg00            lvm2 [8.00 GiB / 8.00 GiB free]
PV /dev/sdc    VG vg00            lvm2 [8.00 GiB / 8.00 GiB free]
PV /dev/sda2   VG vg_iphone       lvm2 [199.51 GiB / 0    free]
PV /dev/sdd                       lvm2 [8.00 GiB]
Total: 4 [223.50 GiB] / in use: 3 [215.50 GiB] / in no VG: 1 [8.00 GiB]

3.vgextend vg擴充套件
[root@iphone dev]# pvcreate /dev/sdd
Physical volume "/dev/sdd" successfully created

[root@iphone dev]# vgextend vg00 /dev/sdd
Volume group "vg00" successfully extended
[root@iphone dev]#
[root@iphone dev]# vgdisplay -v vg00
    Using volume group(s) on command line
    Finding volume group "vg00"
--- Volume group ---
VG Name               vg00
System ID
Format                lvm2
Metadata Areas        3
Metadata Sequence No 2
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                0
Open LV               0
Max PV                0
Cur PV                3
Act PV                3
VG Size               23.99 GiB
PE Size               4.00 MiB
Total PE              6141
Alloc PE / Size       0 / 0
Free PE / Size       6141 / 23.99 GiB
VG UUID               Ui6Kbe-yuAV-KxTB-rIwc-BqQo-0nag-AvNfRF

--- Physical volumes ---
PV Name               /dev/sdb
PV UUID               B2K17I-fed9-sOCq-rbbK-r9EJ-4bdQ-V392a8
PV Status             allocatable
Total PE / Free PE    2047 / 2047

PV Name               /dev/sdc
PV UUID               rPIiBP-8NRC-JzCH-4ghf-2Ef1-SZtV-P1mOo5
PV Status             allocatable
Total PE / Free PE    2047 / 2047

PV Name               /dev/sdd
PV UUID               g92aTC-MK7x-29g8-GsEC-P3ax-GK3z-AA2FRX
PV Status             allocatable
Total PE / Free PE    2047 / 2047

[root@iphone dev]#
[root@iphone dev]# vgscan
Reading all physical volumes. This may take a while...
Found volume group "vg00" using metadata type lvm2
Found volume group "vg_iphone" using metadata type lvm2
[root@iphone dev]#
[root@iphone dev]#
[root@iphone dev]# pvscan
PV /dev/sdb    VG vg00        lvm2 [8.00 GiB / 8.00 GiB free]
PV /dev/sdc    VG vg00        lvm2 [8.00 GiB / 8.00 GiB free]
PV /dev/sdd    VG vg00        lvm2 [8.00 GiB / 8.00 GiB free]
PV /dev/sda2   VG vg_iphone   lvm2 [199.51 GiB / 0    free]
Total: 4 [223.50 GiB] / in use: 4 [223.50 GiB] / in no VG: 0 [0   ]

4.lvcreate --logical volume create & 掛載檔案系統
[root@iphone dev]# lvcreate -L 2G -n lv00 vg00
Logical volume "lv00" created

[root@iphone vg00]# mkfs.ext3 /dev/vg00/lv00
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
131072 inodes, 524288 blocks
26214 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=536870912
16 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912

Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 34 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

[root@iphone ~]# cd /mnt
[root@iphone mnt]# mkdir fs1
[root@iphone mnt]# mount /dev/vg00/lv00 /mnt/fs1/
[root@iphone mnt]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg_iphone-lv_root
                      51606140 43510436   5474264 89% /
tmpfs                  1962952   1028528    934424 53% /dev/shm
/dev/sda1               495844     37919    432325   9% /boot
/dev/mapper/vg_iphone-lv_home
                     150309116    192344 142481420   1% /home
/dev/mapper/vg00-lv00
                       2064208     68676   1890676   4% /mnt/fs1

[root@iphone temp_dir]# cp bu2_20160331.dmp /mnt/fs1/

5.lvextend --logical volumne extend
[root@iphone fs1]# lvextend -L +1G /dev/vg00/lv00
Extending logical volume lv00 to 3.00 GiB
Logical volume lv00 successfully resized

[root@iphone fs1]# lvdisplay /dev/vg00/lv00
--- Logical volume ---
LV Path                /dev/vg00/lv00
LV Name                lv00
VG Name                vg00
LV UUID                TZ60jS-wT93-G5ym-n6yf-4g77-ng2S-3owaC3
LV Write Access        read/write
LV Creation host, time iphone, 2016-05-21 05:11:25 +0800
LV Status              available
# open                 1
LV Size                3.00 GiB
Current LE             768
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           253:3

[root@iphone fs1]# df                     --lv extend,but filesystem is not change
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg_iphone-lv_root
                      51606140 43510460   5474240 89% /
tmpfs                  1962952   1028528    934424 53% /dev/shm
/dev/sda1               495844     37919    432325   9% /boot
/dev/mapper/vg_iphone-lv_home
                     150309116    192344 142481420   1% /home
/dev/mapper/vg00-lv00
                       2064208    141636   1817716   8% /mnt/fs1

--so we need run below script
[root@iphone ~]# resize2fs /mnt/fs1/
resize2fs 1.41.12 (17-May-2010)
open: Is a directory while opening /mnt/fs1/
[root@iphone ~]#
[root@iphone ~]# resize2fs /dev/vg00/lv00
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg00/lv00 is mounted on /mnt/fs1; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 1
Performing an on-line resize of /dev/vg00/lv00 to 786432 (4k) blocks.
The filesystem on /dev/vg00/lv00 is now 786432 blocks long.

[root@iphone ~]# df              --after run scripts,filesystem is change as logical volume.
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg_iphone-lv_root
                      51606140 43510464   5474236 89% /
tmpfs                  1962952   1028528    934424 53% /dev/shm
/dev/sda1               495844     37919    432325   9% /boot
/dev/mapper/vg_iphone-lv_home
                     150309116    192344 142481420   1% /home
/dev/mapper/vg00-lv00
                       3096336    141636   2797428   5% /mnt/fs1


6.lvreduce   --logical volume reduce
[root@iphone ~]# resize2fs /dev/vg00/lv00 2G        --before we reduce the logical volumne,we need run some script.
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg00/lv00 is mounted on /mnt/fs1; on-line resizing required
On-line shrinking from 786432 to 524288 not supported.
[root@iphone ~]#
[root@iphone ~]# umount /mnt/fs1/
[root@iphone ~]# resize2fs /dev/vg00/lv00 2G
resize2fs 1.41.12 (17-May-2010)
Please run 'e2fsck -f /dev/vg00/lv00' first.

[root@iphone ~]# e2fsck -f /dev/vg00/lv00
e2fsck 1.41.12 (17-May-2010)
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/vg00/lv00: 12/196608 files (8.3% non-contiguous), 47757/786432 blocks
[root@iphone ~]#
[root@iphone ~]# resize2fs /dev/vg00/lv00 2G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/vg00/lv00 to 524288 (4k) blocks.
The filesystem on /dev/vg00/lv00 is now 524288 blocks long.

[root@iphone ~]# mount /dev/vg00/lv00 /mnt/fs1/
[root@iphone ~]#
[root@iphone ~]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg_iphone-lv_root
                      51606140 43510492   5474208 89% /
tmpfs                  1962952   1028528    934424 53% /dev/shm
/dev/sda1               495844     37919    432325   9% /boot
/dev/mapper/vg_iphone-lv_home
                     150309116    192344 142481420   1% /home
/dev/mapper/vg00-lv00
                       2064208    141636   1817724   8% /mnt/fs1

[root@iphone fs1]# lvreduce -L 2G /dev/vg00/lv00
WARNING: Reducing active and open logical volume to 2.00 GiB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv00? [y/n]: y
Reducing logical volume lv00 to 2.00 GiB
Logical volume lv00 successfully resized

7.vgreduce   --vg reduce
[root@iphone fs1]# vgreduce vg00 /dev/sdd
Removed "/dev/sdd" from volume group "vg00"
[root@iphone fs1]#
[root@iphone fs1]#
[root@iphone fs1]# vgdisplay -v vg00
    Using volume group(s) on command line
    Finding volume group "vg00"
--- Volume group ---
VG Name               vg00
System ID
Format                lvm2
Metadata Areas        2
Metadata Sequence No 8
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                1
Open LV               1
Max PV                0
Cur PV                2
Act PV                2
VG Size               15.99 GiB
PE Size               4.00 MiB
Total PE              4094
Alloc PE / Size       512 / 2.00 GiB
Free PE / Size       3582 / 13.99 GiB
VG UUID               Ui6Kbe-yuAV-KxTB-rIwc-BqQo-0nag-AvNfRF

--- Logical volume ---
LV Path                /dev/vg00/lv00
LV Name                lv00
VG Name                vg00
LV UUID                TZ60jS-wT93-G5ym-n6yf-4g77-ng2S-3owaC3
LV Write Access        read/write
LV Creation host, time iphone, 2016-05-21 05:11:25 +0800
LV Status              available
# open                 1
LV Size                2.00 GiB
Current LE             512
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           253:3

--- Physical volumes ---
PV Name               /dev/sdb
PV UUID               B2K17I-fed9-sOCq-rbbK-r9EJ-4bdQ-V392a8
PV Status             allocatable
Total PE / Free PE    2047 / 1535

PV Name               /dev/sdc
PV UUID               rPIiBP-8NRC-JzCH-4ghf-2Ef1-SZtV-P1mOo5
PV Status             allocatable
Total PE / Free PE    2047 / 2047

8.pvremove       --physical volume remove
[root@iphone fs1]# pvremove /dev/sdd
Labels on physical volume "/dev/sdd" successfully wiped

9.pvmove          --move physical extent
[root@iphone ~]# pvmove /dev/sdb
/dev/sdb: Moved: 0.4%
/dev/sdb: Moved: 55.0%
/dev/sdb: Moved: 99.8%
/dev/sdb: Moved: 100.0%

10.vgcfgbackup & vgcfgrestore
[root@iphone ~]# vgcfgbackup
Volume group "vg00" successfully backed up.
Volume group "vg_iphone" successfully backed up.

[root@iphone ~]# cd /etc/lvm
[root@iphone lvm]# ll
total 52
drwx------. 2 root root 4096 May 21 06:24 archive
drwx------. 2 root root 4096 May 21 06:30 backup
drwx------. 2 root root 4096 Jan 24 2013 cache
-rw-r--r--. 1 root root 37554 Jan 24 2013 lvm.conf
[root@iphone lvm]# cd backup
[root@iphone backup]# ll
total 8
-rw-------. 1 root root 2300 May 21 06:30 vg00
-rw-------. 1 root root 2091 May 21 06:30 vg_iphone
[root@iphone backup]# vgcfgrestore
Please specify a *single* volume group to restore.
[root@iphone backup]# vgcfgrestore vg00
Restored volume group vg00

11.vgchange    (http://blog.chinaunix.net/uid-14418690-id-2812380.html)
a.單節點
vgchange –a y vgXX　　 #啟用卷組
vgchange –a n vgXX　　#去啟用卷組

b.cluster
vgchange –c y /dev/vgXX 　　#設定VG的exclusive屬性，設定之後VG無法以vgchange –a y 啟用
vgchange –c n /dev/vgXX　　#去掉VG的exclusive屬性，當然設定之後就無法用vgchange –a e來啟用這個VG了。
vgchange –a e /dev/vgXX　　 #以exclusive模式啟用卷組，只在cluster環境下有效,需要首先vgchange –c y /dev/vgXX
vgchange –a n /dev/vgXX     #在cluster模式下去啟用一個VG，仍然是用這個命令。

c.shared
vgchange –c y –S y /dev/vgXX #設定VG為共享模式，設定成功後VG只能用vgchange –a s啟用，如果要用vgchange –a y啟用，則必須先將VG的共享模式去掉(用vgchange –S n /dev/vgxx).   #vgchange –a s /dev/vgXX #以共享方式啟用VG
vgchange –a n /dev/vgXX #在共享模式下去啟用方法不變

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