LVM-HOWTO/学习笔记(三)
1. 在现有的系统中附加新的scsi硬盘
A data centre machine has 6 disks attached as follows:
| # pvscan pvscan -- ACTIVE PV "/dev/sda" of VG "dev" [1.95 GB / 0 free] pvscan -- ACTIVE PV "/dev/sdb" of VG "sales" [1.95 GB / 0 free] pvscan -- ACTIVE PV "/dev/sdc" of VG "ops" [1.95 GB / 44 MB free] pvscan -- ACTIVE PV "/dev/sdd" of VG "dev" [1.95 GB / 0 free] pvscan -- ACTIVE PV "/dev/sde1" of VG "ops" [996 MB / 52 MB free] pvscan -- ACTIVE PV "/dev/sde2" of VG "sales" [996 MB / 944 MB free] pvscan -- ACTIVE PV "/dev/sdf1" of VG "ops" [996 MB / 0 free] pvscan -- ACTIVE PV "/dev/sdf2" of VG "dev" [996 MB / 72 MB free] pvscan -- total: 8 [11.72 GB] / in use: 8 [11.72 GB] / in no VG: 0 [0] |
# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/dev/cvs 1342492 516468 757828 41% /mnt/dev/cvs
/dev/dev/users 2064208 2060036 4172 100% /mnt/dev/users
/dev/dev/build 1548144 1023041 525103 66% /mnt/dev/build
/dev/ops/databases 2890692 2302417 588275 79% /mnt/ops/databases
/dev/sales/users 2064208 871214 1192994 42% /mnt/sales/users
/dev/ops/batch 1032088 897122 134966 86% /mnt/ops/batch
准备磁盘分区
# fdisk /dev/sdg
Device contains neither a valid DOS partition table, nor Sun or SGI
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.
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1000, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-1000, default 1000): 500
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (501-1000, default 501):
Using default value 501
Last cylinder or +size or +sizeM or +sizeK (501-1000, default 1000):
Using default value 1000
Command (m for help): t
Partition number (1-4): 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Unknown)
Command (m for help): t
Partition number (1-4): 2
Hex code (type L to list codes): 8e
Changed system type of partition 2 to 8e (Unknown)
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: If you have created or modified any DOS 6.x partitions,
please see the fdisk manual page for additional information
Next physical volumes are created on this partition:
| # pvcreate /dev/sdg1 pvcreate -- physical volume "/dev/sdg1" successfully created
# pvcreate /dev/sdg2 pvcreate -- physical volume "/dev/sdg2" successfully created |
在vg中添加新的磁盘
The volumes are then added to the dev and ops volume groups:
| # vgextend ops /dev/sdg1 vgextend -- INFO: maximum logical volume size is 255.99 Gigabyte vgextend -- doing automatic backup of volume group "ops" vgextend -- volume group "ops" successfully extended
# vgextend dev /dev/sdg2 vgextend -- INFO: maximum logical volume size is 255.99 Gigabyte vgextend -- doing automatic backup of volume group "dev" vgextend -- volume group "dev" successfully extended
# pvscan pvscan -- reading all physical volumes (this may take a while...) pvscan -- ACTIVE PV "/dev/sda" of VG "dev" [1.95 GB / 0 free] pvscan -- ACTIVE PV "/dev/sdb" of VG "sales" [1.95 GB / 0 free] pvscan -- ACTIVE PV "/dev/sdc" of VG "ops" [1.95 GB / 44 MB free] pvscan -- ACTIVE PV "/dev/sdd" of VG "dev" [1.95 GB / 0 free] pvscan -- ACTIVE PV "/dev/sde1" of VG "ops" [996 MB / 52 MB free] pvscan -- ACTIVE PV "/dev/sde2" of VG "sales" [996 MB / 944 MB free] pvscan -- ACTIVE PV "/dev/sdf1" of VG "ops" [996 MB / 0 free] pvscan -- ACTIVE PV "/dev/sdf2" of VG "dev" [996 MB / 72 MB free] pvscan -- ACTIVE PV "/dev/sdg1" of VG "ops" [996 MB / 996 MB free] pvscan -- ACTIVE PV "/dev/sdg2" of VG "dev" [996 MB / 996 MB free] pvscan -- total: 10 [13.67 GB] / in use: 10 [13.67 GB] / in no VG: 0 [0] |
扩展文件系统
# umount /mnt/ops/batch
# umount /mnt/dev/users
We then use the e2fsadm command to resize the logical volume and the ext2 file system on one operation. We are using ext2resize instead of resize2fs (which is the default command for e2fsadm) so we define the environment variable E2FSADM_RESIZE_CMD to tell e2fsadm to use that command.
| # export E2FSADM_RESIZE_CMD=ext2resize # e2fsadm /dev/ops/batch -L+500M e2fsck 1.18, 11-Nov-1999 for EXT2 FS 0.5b, 95/08/09 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/ops/batch: 11/131072 files (0.0<!-- non-contiguous), 4127/262144 blocks lvextend -- extending logical volume "/dev/ops/batch" to 1.49 GB lvextend -- doing automatic backup of volume group "ops" lvextend -- logical volume "/dev/ops/batch" successfully extended
ext2resize v1.1.15 - 2000/08/08 for EXT2FS 0.5b e2fsadm -- ext2fs in logical volume "/dev/ops/batch" successfully extended to 1.49 GB
# e2fsadm /dev/dev/users -L+900M e2fsck 1.18, 11-Nov-1999 for EXT2 FS 0.5b, 95/08/09 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/dev/users: 12/262144 files (0.0% non-contiguous), 275245/524288 blocks lvextend -- extending logical volume "/dev/dev/users" to 2.88 GB lvextend -- doing automatic backup of volume group "dev" lvextend -- logical volume "/dev/dev/users" successfully extended
ext2resize v1.1.15 - 2000/08/08 for EXT2FS 0.5b e2fsadm -- ext2fs in logical volume "/dev/dev/users" successfully extended to 2.88 GB |
# mount /dev/ops/batch
# mount /dev/dev/users
# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/dev/cvs 1342492 516468 757828 41% /mnt/dev/cvs
/dev/dev/users 2969360 2060036 909324 69% /mnt/dev/users
/dev/dev/build 1548144 1023041 525103 66% /mnt/dev/build
/dev/ops/databases 2890692 2302417 588275 79% /mnt/ops/databases
/dev/sales/users 2064208 871214 1192994 42% /mnt/sales/users
/dev/ops/batch 1535856 897122 638734 58% /mnt/ops/batch