手动再添加两块硬盘（SCSI类型），容量均为8G，分别将两块硬盘设置为一个主分区（2G容量）和两个逻辑分区（分别2G容量），并完成PV物理卷的初始化操作；
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 19.5G 0 part
├─centos-root 253:0 0 17.5G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 8G 0 disk
sdc 8:32 0 8G 0 disk
sr0 11:0 1 4G 0 rom /run/media/root/CentOS 7 x86_64
#磁盘分区
[root@localhost ~]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x21d517a7.
Command (m for help): n #添加新分区
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-16777215, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-16777215, default 16777215): +2G
Partition 1 of type Linux and of size 2 GiB is set
Command (m for help): n
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p): e
Partition number (2-4, default 2):
First sector (4196352-16777215, default 4196352):
Using default value 4196352
Last sector, +sectors or +size{K,M,G} (4196352-16777215, default 16777215):
Using default value 16777215
Partition 2 of type Extended and of size 6 GiB is set
Command (m for help): n
Partition type:
p primary (1 primary, 1 extended, 2 free)
l logical (numbered from 5)
Select (default p): l
Adding logical partition 5
First sector (4198400-16777215, default 4198400):
Using default value 4198400
Last sector, +sectors or +size{K,M,G} (4198400-16777215, default 16777215): +2G
Partition 5 of type Linux and of size 2 GiB is set
Command (m for help): n
Partition type:
p primary (1 primary, 1 extended, 2 free)
l logical (numbered from 5)
Select (default p): l
Adding logical partition 6
First sector (8394752-16777215, default 8394752):
Using default value 8394752
Last sector, +sectors or +size{K,M,G} (8394752-16777215, default 16777215): +2G
Partition 6 of type Linux and of size 2 GiB is set
Command (m for help): w
#冗余操作不再描述
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 19.5G 0 part
├─centos-root 253:0 0 17.5G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 8G 0 disk
├─sdb1 8:17 0 2G 0 part
├─sdb2 8:18 0 1K 0 part
├─sdb5 8:21 0 2G 0 part
└─sdb6 8:22 0 2G 0 part
sdc 8:32 0 8G 0 disk
├─sdc1 8:33 0 2G 0 part
├─sdc2 8:34 0 1K 0 part
├─sdc5 8:37 0 2G 0 part
└─sdc6 8:38 0 2G 0 part
sr0 11:0 1 4G 0 rom /run/media/root/CentOS 7 x86_64
[root@localhost ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created
[root@localhost ~]# pvcreate /dev/sdb5
Physical volume "/dev/sdb5" successfully created
[root@localhost ~]# pvcreate /dev/sdb6
Physical volume "/dev/sdb6" successfully created
[root@localhost ~]# pvcreate /dev/sdc1
Physical volume "/dev/sdc1" successfully created
[root@localhost ~]# pvcreate /dev/sdc5
Physical volume "/dev/sdc5" successfully created
[root@localhost ~]# pvcreate /dev/sdc6
Physical volume "/dev/sdc6" successfully created将/dev/sdb1及/dev/sdc5加入到卷组VG1中，其显示的逻辑卷名称为LV1，格式化为ext3文件系统，对应挂载目录为/volume，并针对/volume目录实现开机自动挂载；
[root@localhost ~]# vgcreate VG1 /dev/sdb1 /dev/sdc5
Volume group "VG1" successfully created
[root@localhost ~]# lvcreate -L 3.99G -n LV1 VG1
Rounding up size to full physical extent 3.99 GiB
Logical volume "LV1" created.
[root@localhost ~]# mkfs.ext3 /dev/VG1/LV1
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
261632 inodes, 1046528 blocks
52326 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=1073741824
32 block groups
32768 blocks per group, 32768 fragments per group
8176 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736
Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done
[root@localhost ~]# mkdir /volume
[root@localhost ~]# vi /etc/fstab
#
# /etc/fstab
# Created by anaconda on Fri Oct 29 17:30:58 2021
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root / xfs defaults 0 0
UUID=de750585-8461-4264-a9f8-e5a6d13bc733 /boot xfs defaults 0 0
/dev/mapper/centos-swap swap swap defaults 0 0
/dev/VG1/LV1 /volume ext3 defaults 0 0
@localhost ~]# mount -a
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 19.5G 0 part
├─centos-root 253:0 0 17.5G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 8G 0 disk
├─sdb1 8:17 0 2G 0 part
│ └─VG1-LV1 253:2 0 4G 0 lvm /volume针对现有的逻辑卷/dev/vg1/lv1实现在线扩容，将/dev/sdb5分区加入到已有的逻辑卷LV1中，实现目录/volume在线扩容2G容量，总容量达到6G；
[root@localhost ~]# vgextend VG1 /dev/sdb5
Volume group "VG1" successfully extended
[root@localhost ~]# lvextend -L +1.99G /dev/VG1/LV1
Rounding size to boundary between physical extents: 1.99 GiB
Size of logical volume VG1/LV1 changed from 3.99 GiB (1022 extents) to 5.98 GiB (1532 extents).
Logical volume LV1 successfully resized.
oot@localhost ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
LV1 VG1 -wi-ao---- 5.98g
root centos -wi-ao---- 17.47g
swap centos -wi-ao---- 2.00g 利用分区/dev/sdb6及/dev/sdc1完成条带卷的设置，条带容量为8KB，建立的条带卷容量为2G，卷组名称VG1，条带卷名称为stripe1；
[root@localhost ~]# vgextend VG1 /dev/sdb6 /dev/sdc1
Volume group "VG1" successfully extended
[root@localhost ~]# lvcreate -n stripe1 -L 1.99G -i 2 -I 8 VG1 /dev/sdb6 /dev/sdc1
Rounding up size to full physical extent 1.99 GiB
Logical volume "stripe1" created.
root@localhost ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
LV1 VG1 -wi-ao---- 5.98g
stripe1 VG1 -wi-a----- 1.99g
[root@localhost ~]# lvdisplay
--- Logical volume ---
LV Path /dev/VG1/stripe1
LV Name stripe1
VG Name VG1
LV UUID Tf6b2X-z9FH-KO7O-lXkS-Lr43-cRA2-gEUAxd
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2021-11-02 11:32:02 -0100
LV Status available
# open 0
LV Size 1.99 GiB
Current LE 510
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:3利用分区/dev/sdc6完成条带卷的设置，条带容量为64KB，建立的条带卷容量为3G，卷组名称VG1，条带卷名称为stripe2；
[root@localhost ~]# vgextend VG1 /dev/sdc6
Volume group "VG1" successfully extended
[root@localhost ~]# lvcreate -n stripe2 -L 1.99G -i 1 -I 64 VG1 /dev/sdc6
Ignoring stripesize argument with single stripe.
Rounding up size to full physical extent 1.99 GiB
Logical volume "stripe2" created.
[root@localhost ~]# lvdisplay
--- Logical volume ---
LV Path /dev/VG1/stripe2
LV Name stripe2
VG Name VG1
LV UUID uy8sUR-8O1Z-8ln3-umnp-2yIT-Ak2H-Uo0UwY
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2021-11-02 11:37:10 -0100
LV Status available
# open 0
LV Size 1.99 GiB
Current LE 510
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:4
借助命令hdparm完成磁盘读写速度的测试，
[root@localhost ~]# yum -y install hdparm.x86_64
[root@localhost ~]# hdparm -t /dev/VG1/stripe1
/dev/VG1/stripe1:
Timing buffered disk reads: 2040 MB in 0.95 seconds = 2146.13 MB/sec
[root@localhost ~]# hdparm -t /dev/VG1/stripe2
/dev/VG1/stripe2:
Timing buffered disk reads: 2040 MB in 0.63 seconds = 3213.29 MB/sec
扫一扫
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
