Linux磁盘、文件系统、RAID、LVM 计算机网络基础与TCP/IP协议

1、磁盘lvm管理，完成下面要求，并写出详细过程：

1) 创建一个至少有两个PV组成的大小为20G的名为testvg的VG;要求PE大小 为16MB, 而后在卷组中创建大小为5G的逻辑卷testlv;挂载至/users目录

我采取的是1个10G的分区和1个10G的硬盘组成20G

1.用lsblk查看目前硬盘的情况

[root@centos6 ~]#lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0  200G  0 disk 
├─sda1   8:1    0    1G  0 part /boot
├─sda2   8:2    0 48.8G  0 part /
├─sda3   8:3    0 29.3G  0 part /data
├─sda4   8:4    0    1K  0 part 
└─sda5   8:5    0    2G  0 part [SWAP]
sdc      8:32   0   20G  0 disk 
sdd      8:48   0   20G  0 disk 
sde      8:64   0   10G  0 disk 
sdb      8:16   0   20G  0 disk 
sr0     11:0    1  3.7G  0 rom  /media/CentOS_6.10_Final

2.sdc分出10G，system为Linux LVM

[root@centos6 ~]#fdisk /dev/sdc
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x66e4184d.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-2610, default 1): 
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): +10G

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)

Command (m for help): p

Disk /dev/sdc: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x66e4184d

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1        1306    10490413+  8e  Linux LVM

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root@centos6 ~]#lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0  200G  0 disk 
├─sda1   8:1    0    1G  0 part /boot
├─sda2   8:2    0 48.8G  0 part /
├─sda3   8:3    0 29.3G  0 part /data
├─sda4   8:4    0    1K  0 part 
└─sda5   8:5    0    2G  0 part [SWAP]
sdc      8:32   0   20G  0 disk 
└─sdc1   8:33   0   10G  0 part 
sdd      8:48   0   20G  0 disk 
sde      8:64   0   10G  0 disk 
sdb      8:16   0   20G  0 disk 
sr0     11:0    1  3.7G  0 rom  /media/CentOS_6.10_Final

3.将sdc1与sde创建成PV

[root@centos6 ~]#pvcreate /dev/sd{c1,e}
  Physical volume "/dev/sdc1" successfully created
  Physical volume "/dev/sde" successfully created
[root@centos6 ~]#pvs
  PV         VG   Fmt  Attr PSize  PFree 
  /dev/sdc1       lvm2 ---- 10.00g 10.00g
  /dev/sde        lvm2 ---- 10.00g 10.00g
[root@centos6 ~]#pvdisplay 
  "/dev/sdc1" is a new physical volume of "10.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdc1
  VG Name               
  PV Size               10.00 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               rkC2uz-MLNF-BAl3-LyGF-XfRe-kjCn-UHHofX
   
  "/dev/sde" is a new physical volume of "10.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sde
  VG Name               
  PV Size               10.00 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               LHTZjo-q2ux-xnlc-OCNz-LL32-GhXc-Ybqg3r

4.创建20G名为testvg的VG，PE大小为16MB

[root@centos6 ~]#vgcreate -s 16M testvg /dev/sd{c1,e}
  Volume group "testvg" successfully created
[root@centos6 ~]#vgs
  VG     #PV #LV #SN Attr   VSize  VFree 
  testvg   2   0   0 wz--n- 19.98g 19.98g
[root@centos6 ~]#vgdisplay 
  --- Volume group ---
  VG Name               testvg
  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               19.98 GiB
  PE Size               16.00 MiB
  Total PE              1279
  Alloc PE / Size       0 / 0   
  Free  PE / Size       1279 / 19.98 G