Redhat Linux5.3 32bit操作系统LVM学习笔记之二（在线调整镜像卷大小）
2016-09-11 22:19
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本文以Linux5.4 32Bit操作系统为例，简要说明LVM的管理操作。
此操作系统版本旧，LVM功能相对于rhel6和rhel7有很多不足之处，可用参数也不够多。
以下操作是在vmware虚拟机中测试。
在生产中建议尽快升级操作系统，或迁移应用到更高的操作系统版本上。
1、在线缩小，无法在线完成，需要umount文件系统才能做缩小,,风险较大，建议备份数据后再操作
[root@linux54 ~]# resize2fs /dev/datavg/datalv01 4g
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/datavg/datalv01 is mounted on /data; on-line resizing required
On-line shrinking from 1572864 to 1048576 not supported.
[root@linux54 ~]# umount /data
[root@linux54 ~]# resize2fs /dev/datavg/datalv01 4g
resize2fs 1.39 (29-May-2006)
Please run 'e2fsck -f /dev/datavg/datalv01' first.
[root@linux54 ~]# e2fsck -f /dev/datavg/datalv01
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/datavg/datalv01: 11/786432 files (9.1% non-contiguous), 60560/1572864 blocks
[root@linux54 ~]# resize2fs /dev/datavg/datalv01 4g
resize2fs 1.39 (29-May-2006)
Resizing the filesystem on /dev/datavg/datalv01 to 1048576 (4k) blocks.
The filesystem on /dev/datavg/datalv01 is now 1048576 blocks long.
[root@linux54 ~]# lvreduce -L 4G /dev/datavg/datalv01
WARNING: Reducing active logical volume to 4.00 GB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce datalv01? [y/n]: y
Reducing logical volume datalv01 to 4.00 GB
Logical volume datalv01 successfully resized
[root@linux54 ~]#
[root@linux54 ~]# mount /dev/datavg/datalv01 /data
[root@linux54 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rootvg-root
17G 2.6G 14G 16% /
/dev/sda1 487M 17M 445M 4% /boot
tmpfs 1014M 0 1014M 0% /dev/shm
/dev/mapper/datavg-datalv01
4.0G 141M 3.7G 4% /data
[root@linux54 ~]# lvs -a -o +devices |grep datalv01
datalv01 datavg mwi-ao 4.00G 100.00 datalv01_mimage_0(0),datalv01_mimage_1(0)
[datalv01_mimage_0] datavg iwi-ao 4.00G /dev/sdb(0)
[datalv01_mimage_1] datavg iwi-ao 4.00G /dev/sdc(0)
[root@linux54 ~]# pvs --segment -v |grep datalv01
Scanning for physical volume names
/dev/sdb datavg lvm2 a- 5.00G 1020.00M 0 1024 [datalv01_mimage_0] 0 linear /dev/sdb:0-1023
/dev/sdc datavg lvm2 a- 5.00G 1020.00M 0 1024 [datalv01_mimage_1] 0 linear /dev/sdc:0-1023
[root@linux54 ~]#
2、在线扩大，占满所在磁盘空间
[root@linux54 ~]# lvextend -l 1279 /dev/datavg/datalv01
Extending 2 mirror images.
Extending logical volume datalv01 to 5.00 GB
Logical volume datalv01 successfully resized
[root@linux54 ~]#
[root@linux54 ~]# resize2fs /dev/datavg/datalv01 不加大小，就是调整到lv大小
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/datavg/datalv01 is mounted on /data; on-line resizing required
Performing an on-line resize of /dev/datavg/datalv01 to 1309696 (4k) blocks.
The filesystem on /dev/datavg/datalv01 is now 1309696 blocks long.
[root@linux54 ~]#
[root@linux54 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rootvg-root
17G 2.6G 14G 16% /
/dev/sda1 487M 17M 445M 4% /boot
tmpfs 1014M 0 1014M 0% /dev/shm
/dev/mapper/datavg-datalv01
5.0G 141M 4.7G 3% /data
[root@linux54 ~]#
[root@linux54 ~]# lvs -a -o +devices |grep datalv01
datalv01 datavg mwi-ao 5.00G 100.00 datalv01_mimage_0(0),datalv01_mimage_1(0)
[datalv01_mimage_0] datavg iwi-ao 5.00G /dev/sdb(0)
[datalv01_mimage_1] datavg iwi-ao 5.00G /dev/sdc(0)
[root@linux54 ~]# pvs --segment -v
Scanning for physical volume names
PV VG Fmt Attr PSize PFree Start SSize LV Start Type PE Ranges
/dev/sda2 rootvg lvm2 a- 19.50G 0 0 560 root 0 linear /dev/sda2:0-559
/dev/sda2 rootvg lvm2 a- 19.50G 0 560 64 swap 0 linear /dev/sda2:560-623
/dev/sdb datavg lvm2 a- 5.00G 0 0 1279 [datalv01_mimage_0] 0 linear /dev/sdb:0-1278
/dev/sdc datavg lvm2 a- 5.00G 0 0 1279 [datalv01_mimage_1] 0 linear /dev/sdc:0-1278
/dev/sdd datavg lvm2 a- 5.00G 5.00G 0 1279 0 free
/dev/sde datavg lvm2 a- 5.00G 5.00G 0 1279 0 free
[root@linux54 ~]#
3、在线扩大
[root@linux54 ~]# lvextend -L 8g /dev/datavg/datalv01 /dev/sdd /dev/sde 可以不指定磁盘，在卷组中的磁盘扩大。某些场合需要指定。例如镜像的存储来源不同。
Extending 2 mirror images.
Extending logical volume datalv01 to 8.00 GB
Logical volume datalv01 successfully resized
[root@linux54 ~]#
[root@linux54 ~]# resize2fs /dev/datavg/datalv01 8g 这个操作无发放置到后台运行，如果扩展的空间较大，花费的时间相当长。算是这个版本LVM的一个重大弱点。
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/datavg/datalv01 is mounted on /data; on-line resizing required
Performing an on-line resize of /dev/datavg/datalv01 to 2097152 (4k) blocks.
The filesystem on /dev/datavg/datalv01 is now 2097152 blocks long.
[root@linux54 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rootvg-root
17G 2.6G 14G 16% /
/dev/sda1 487M 17M 445M 4% /boot
tmpfs 1014M 0 1014M 0% /dev/shm
/dev/mapper/datavg-datalv01
7.9G 142M 7.6G 2% /data
[root@linux54 ~]#
[root@linux54 ~]# pvs --segment -v |grep datalv01
Scanning for physical volume names
/dev/sdb datavg lvm2 a- 5.00G 0 0 1279 [datalv01_mimage_0] 0 linear /dev/sdb:0-1278
/dev/sdc datavg lvm2 a- 5.00G 0 0 1279 [datalv01_mimage_1] 0 linear /dev/sdc:0-1278
/dev/sdd datavg lvm2 a- 5.00G 1.99G 0 769 [datalv01_mimage_0] 1279 linear /dev/sdd:0-768
/dev/sde datavg lvm2 a- 5.00G 1.99G 0 769 [datalv01_mimage_1] 1279 linear /dev/sde:0-768
[root@linux54 ~]# lvs -a -o +devices |grep datalv01
datalv01 datavg mwi-ao 8.00G 100.00 datalv01_mimage_0(0),datalv01_mimage_1(0)
[datalv01_mimage_0] datavg iwi-ao 8.00G /dev/sdb(0)
[datalv01_mimage_0] datavg iwi-ao 8.00G /dev/sdd(0)
[datalv01_mimage_1] datavg iwi-ao 8.00G /dev/sdc(0)
[datalv01_mimage_1] datavg iwi-ao 8.00G /dev/sde(0)
[root@linux54 ~]#
本文以Linux5.4 32Bit操作系统为例，简要说明LVM的管理操作。
此操作系统版本旧，LVM功能相对于rhel6和rhel7有很多不足之处，可用参数也不够多。
以下操作是在vmware虚拟机中测试。
在生产中建议尽快升级操作系统，或迁移应用到更高的操作系统版本上。
1、在线缩小，无法在线完成，需要umount文件系统才能做缩小,,风险较大，建议备份数据后再操作
[root@linux54 ~]# resize2fs /dev/datavg/datalv01 4g
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/datavg/datalv01 is mounted on /data; on-line resizing required
On-line shrinking from 1572864 to 1048576 not supported.
[root@linux54 ~]# umount /data
[root@linux54 ~]# resize2fs /dev/datavg/datalv01 4g
resize2fs 1.39 (29-May-2006)
Please run 'e2fsck -f /dev/datavg/datalv01' first.
[root@linux54 ~]# e2fsck -f /dev/datavg/datalv01
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/datavg/datalv01: 11/786432 files (9.1% non-contiguous), 60560/1572864 blocks
[root@linux54 ~]# resize2fs /dev/datavg/datalv01 4g
resize2fs 1.39 (29-May-2006)
Resizing the filesystem on /dev/datavg/datalv01 to 1048576 (4k) blocks.
The filesystem on /dev/datavg/datalv01 is now 1048576 blocks long.
[root@linux54 ~]# lvreduce -L 4G /dev/datavg/datalv01
WARNING: Reducing active logical volume to 4.00 GB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce datalv01? [y/n]: y
Reducing logical volume datalv01 to 4.00 GB
Logical volume datalv01 successfully resized
[root@linux54 ~]#
[root@linux54 ~]# mount /dev/datavg/datalv01 /data
[root@linux54 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rootvg-root
17G 2.6G 14G 16% /
/dev/sda1 487M 17M 445M 4% /boot
tmpfs 1014M 0 1014M 0% /dev/shm
/dev/mapper/datavg-datalv01
4.0G 141M 3.7G 4% /data
[root@linux54 ~]# lvs -a -o +devices |grep datalv01
datalv01 datavg mwi-ao 4.00G 100.00 datalv01_mimage_0(0),datalv01_mimage_1(0)
[datalv01_mimage_0] datavg iwi-ao 4.00G /dev/sdb(0)
[datalv01_mimage_1] datavg iwi-ao 4.00G /dev/sdc(0)
[root@linux54 ~]# pvs --segment -v |grep datalv01
Scanning for physical volume names
/dev/sdb datavg lvm2 a- 5.00G 1020.00M 0 1024 [datalv01_mimage_0] 0 linear /dev/sdb:0-1023
/dev/sdc datavg lvm2 a- 5.00G 1020.00M 0 1024 [datalv01_mimage_1] 0 linear /dev/sdc:0-1023
[root@linux54 ~]#
2、在线扩大，占满所在磁盘空间
[root@linux54 ~]# lvextend -l 1279 /dev/datavg/datalv01
Extending 2 mirror images.
Extending logical volume datalv01 to 5.00 GB
Logical volume datalv01 successfully resized
[root@linux54 ~]#
[root@linux54 ~]# resize2fs /dev/datavg/datalv01 不加大小，就是调整到lv大小
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/datavg/datalv01 is mounted on /data; on-line resizing required
Performing an on-line resize of /dev/datavg/datalv01 to 1309696 (4k) blocks.
The filesystem on /dev/datavg/datalv01 is now 1309696 blocks long.
[root@linux54 ~]#
[root@linux54 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rootvg-root
17G 2.6G 14G 16% /
/dev/sda1 487M 17M 445M 4% /boot
tmpfs 1014M 0 1014M 0% /dev/shm
/dev/mapper/datavg-datalv01
5.0G 141M 4.7G 3% /data
[root@linux54 ~]#
[root@linux54 ~]# lvs -a -o +devices |grep datalv01
datalv01 datavg mwi-ao 5.00G 100.00 datalv01_mimage_0(0),datalv01_mimage_1(0)
[datalv01_mimage_0] datavg iwi-ao 5.00G /dev/sdb(0)
[datalv01_mimage_1] datavg iwi-ao 5.00G /dev/sdc(0)
[root@linux54 ~]# pvs --segment -v
Scanning for physical volume names
PV VG Fmt Attr PSize PFree Start SSize LV Start Type PE Ranges
/dev/sda2 rootvg lvm2 a- 19.50G 0 0 560 root 0 linear /dev/sda2:0-559
/dev/sda2 rootvg lvm2 a- 19.50G 0 560 64 swap 0 linear /dev/sda2:560-623
/dev/sdb datavg lvm2 a- 5.00G 0 0 1279 [datalv01_mimage_0] 0 linear /dev/sdb:0-1278
/dev/sdc datavg lvm2 a- 5.00G 0 0 1279 [datalv01_mimage_1] 0 linear /dev/sdc:0-1278
/dev/sdd datavg lvm2 a- 5.00G 5.00G 0 1279 0 free
/dev/sde datavg lvm2 a- 5.00G 5.00G 0 1279 0 free
[root@linux54 ~]#
3、在线扩大
[root@linux54 ~]# lvextend -L 8g /dev/datavg/datalv01 /dev/sdd /dev/sde 可以不指定磁盘，在卷组中的磁盘扩大。某些场合需要指定。例如镜像的存储来源不同。
Extending 2 mirror images.
Extending logical volume datalv01 to 8.00 GB
Logical volume datalv01 successfully resized
[root@linux54 ~]#
[root@linux54 ~]# resize2fs /dev/datavg/datalv01 8g 这个操作无发放置到后台运行，如果扩展的空间较大，花费的时间相当长。算是这个版本LVM的一个重大弱点。
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/datavg/datalv01 is mounted on /data; on-line resizing required
Performing an on-line resize of /dev/datavg/datalv01 to 2097152 (4k) blocks.
The filesystem on /dev/datavg/datalv01 is now 2097152 blocks long.
[root@linux54 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rootvg-root
17G 2.6G 14G 16% /
/dev/sda1 487M 17M 445M 4% /boot
tmpfs 1014M 0 1014M 0% /dev/shm
/dev/mapper/datavg-datalv01
7.9G 142M 7.6G 2% /data
[root@linux54 ~]#
[root@linux54 ~]# pvs --segment -v |grep datalv01
Scanning for physical volume names
/dev/sdb datavg lvm2 a- 5.00G 0 0 1279 [datalv01_mimage_0] 0 linear /dev/sdb:0-1278
/dev/sdc datavg lvm2 a- 5.00G 0 0 1279 [datalv01_mimage_1] 0 linear /dev/sdc:0-1278
/dev/sdd datavg lvm2 a- 5.00G 1.99G 0 769 [datalv01_mimage_0] 1279 linear /dev/sdd:0-768
/dev/sde datavg lvm2 a- 5.00G 1.99G 0 769 [datalv01_mimage_1] 1279 linear /dev/sde:0-768
[root@linux54 ~]# lvs -a -o +devices |grep datalv01
datalv01 datavg mwi-ao 8.00G 100.00 datalv01_mimage_0(0),datalv01_mimage_1(0)
[datalv01_mimage_0] datavg iwi-ao 8.00G /dev/sdb(0)
[datalv01_mimage_0] datavg iwi-ao 8.00G /dev/sdd(0)
[datalv01_mimage_1] datavg iwi-ao 8.00G /dev/sdc(0)
[datalv01_mimage_1] datavg iwi-ao 8.00G /dev/sde(0)
[root@linux54 ~]#
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