从这里开始，我如何调整 /usr、/var 和 /home 分区中的空间大小而不会丢失数据（如果可能的话），并且处于正常模式（无恢复模式），因为是远程服务器。我看过其他帖子（如何使用 mdadm 调整 RAID1 阵列的大小？，Linux：从包含数据的分区创建软件 RAID 1) 和文档，但我不确定该过程。谢谢。
rdw@u18702824:~$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 7.8G 4.0K 7.8G 1% /dev
tmpfs 1.6G 1.4M 1.6G 1% /run
/dev/md1 4.0G 3.4G 549M 87% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
none 5.0M 0 5.0M 0% /run/lock
none 7.8G 8.0K 7.8G 1% /run/shm
none 100M 28K 100M 1% /run/user
/dev/mapper/vg00-usr 4.8G 4.8G 0 100% /usr
/dev/mapper/vg00-var 4.8G 2.5G 2.1G 55% /var
/dev/mapper/vg00-home 4.8G 2.9G 1.8G 62% /home
======================================================
rdw@u18702824:~$ sudo mdadm --detail /dev/md1
/dev/md1:
Version : 0.90
Creation Time : Mon Feb 6 14:19:22 2017
Raid Level : raid1
Array Size : 4194240 (4.00 GiB 4.29 GB)
Used Dev Size : 4194240 (4.00 GiB 4.29 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Thu Feb 23 12:10:34 2017
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 3562dace:6f38a4cf:1f51fb89:78ee93fe
Events : 0.72
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
======================================================
rdw@u18702824:~$ sudo mdadm --detail /dev/md3
/dev/md3:
Version : 0.90
Creation Time : Mon Feb 6 14:19:23 2017
Raid Level : raid1
Array Size : 1458846016 (1391.26 GiB 1493.86 GB)
Used Dev Size : 1458846016 (1391.26 GiB 1493.86 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 3
Persistence : Superblock is persistent
Update Time : Thu Feb 23 12:10:46 2017
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 52d90469:78a9a458:1f51fb89:78ee93fe
Events : 0.1464
Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
1 8 19 1 active sync /dev/sdb3
======================================================
rdw@u18702824:~$ sudo lvdisplay
--- Logical volume ---
LV Path /dev/vg00/usr
LV Name usr
VG Name vg00
LV UUID dwihnp-aXSl-rCly-MvlH-FoxI-hDrv-mDnVNJ
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 1
LV Size 5.00 GiB
Current LE 1280
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:0
--- Logical volume ---
LV Path /dev/vg00/var
LV Name var
VG Name vg00
LV UUID I5eIwR-dunS-3ua2-IrSw-3C30-cxOS-zLj3a4
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 1
LV Size 5.00 GiB
Current LE 1280
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:1
--- Logical volume ---
LV Path /dev/vg00/home
LV Name home
VG Name vg00
LV UUID 4tYJyU-wlnF-qERG-95Wt-2rR4-Gyfs-NofCZd
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 1
LV Size 5.00 GiB
Current LE 1280
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:2
======================================================
rdw@u18702824:~$ sudo vgdisplay
--- Volume group ---
VG Name vg00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 1.36 TiB
PE Size 4.00 MiB
Total PE 356163
Alloc PE / Size 3840 / 15.00 GiB
Free PE / Size 352323 / 1.34 TiB
VG UUID av08Kn-EzMV-2mie-HE97-cHcr-oL1x-qmYMz6
======================================================
rdw@u18702824:~$ sudo lvscan
ACTIVE '/dev/vg00/usr' [5.00 GiB] inherit
ACTIVE '/dev/vg00/var' [5.00 GiB] inherit
ACTIVE '/dev/vg00/home' [5.00 GiB] inherit
rdw@u18702824:~$ sudo lvmdiskscan
/dev/ram0 [ 64.00 MiB]
/dev/vg00/usr [ 5.00 GiB]
/dev/ram1 [ 64.00 MiB]
/dev/md1 [ 4.00 GiB]
/dev/vg00/var [ 5.00 GiB]
/dev/ram2 [ 64.00 MiB]
/dev/sda2 [ 2.00 GiB]
/dev/vg00/home [ 5.00 GiB]
/dev/ram3 [ 64.00 MiB]
/dev/md3 [ 1.36 TiB] LVM physical volume
/dev/ram4 [ 64.00 MiB]
/dev/ram5 [ 64.00 MiB]
/dev/ram6 [ 64.00 MiB]
/dev/ram7 [ 64.00 MiB]
/dev/ram8 [ 64.00 MiB]
/dev/ram9 [ 64.00 MiB]
/dev/ram10 [ 64.00 MiB]
/dev/ram11 [ 64.00 MiB]
/dev/ram12 [ 64.00 MiB]
/dev/ram13 [ 64.00 MiB]
/dev/ram14 [ 64.00 MiB]
/dev/ram15 [ 64.00 MiB]
/dev/sdb2 [ 2.00 GiB]
3 disks
19 partitions
0 LVM physical volume whole disks
1 LVM physical volume
======================================================
rdw@u18702824:~$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 sdb1[1] sda1[0]
4194240 blocks [2/2] [UU]
md3 : active raid1 sdb3[1] sda3[0]
1458846016 blocks [2/2] [UU]
unused devices: <none>
答案1
因此您的卷组有超过 1TB 的可用空间。
rdw@u18702824:~$ sudo vgdisplay
--- Volume group ---
VG Name vg00
...
VG Size 1.36 TiB
PE Size 4.00 MiB
Total PE 356163
Alloc PE / Size 3840 / 15.00 GiB
Free PE / Size 352323 / 1.34 TiB
如果您想要再添加 10GB 以达到/usr总共 15GB，您应该使用如下命令（假设您的文件系统是 ext2、3 或 4）{参考}。
lvextend -L+10G /dev/vg00/usr
resize2fs /dev/vg00/usr