我有一台 Linux 专用服务器，我需要更多空间，比如 500G。我发现我的文件系统只有 4G。我从这篇文章中找到了一篇增加逻辑卷大小的文章 https://help.1and1.com/servers-c37684/dedicated-server-linux-c37687/administration-c37694/increase-the-size-of-the-logical-volume-a756168.html（我在 1and1）
所以我做了以下事情：
首先，我在一个目录上安装了两个文件系统，由于某种原因，umount 命令不起作用
[root@u17669867 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md1 4.0G 2.7G 1.4G 67% /
/dev/mapper/ssd-var 4.0G 2.7G 1.4G 67% /
[root@u17669867 ~]# fdisk -l
Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
81 heads, 63 sectors/track, 382818 cylinders
Units = cylinders of 5103 * 512 = 2612736 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x4dfb2370
Device Boot Start End Blocks Id System
/dev/sdc1 1 382819 976761560 fd Linux raid autodetect
Disk /dev/sdb: 240.1 GB, 240057409536 bytes
255 heads, 63 sectors/track, 29185 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: 0xb322c93e
Device Boot Start End Blocks Id System
/dev/sdb1 1 523 4194304 fd Linux raid autodetect
Partition 1 does not end on cylinder boundary.
/dev/sdb2 523 784 2097152 82 Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/sdb3 784 29186 228138584 fd Linux raid autodetect
Partition 3 does not end on cylinder boundary.
Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
81 heads, 63 sectors/track, 382818 cylinders
Units = cylinders of 5103 * 512 = 2612736 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x8c756b43
Device Boot Start End Blocks Id System
/dev/sdd1 1 382819 976761560 fd Linux raid autodetect
Disk /dev/sda: 240.1 GB, 240057409536 bytes
255 heads, 63 sectors/track, 29185 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: 0x26616fe2
Device Boot Start End Blocks Id System
/dev/sda1 1 523 4194304 fd Linux raid autodetect
Partition 1 does not end on cylinder boundary.
/dev/sda2 523 784 2097152 82 Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/sda3 784 29186 228138584 fd Linux raid autodetect
Partition 3 does not end on cylinder boundary.
Disk /dev/md3: 233.6 GB, 233613819904 bytes
2 heads, 4 sectors/track, 57034624 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/md1: 4294 MB, 4294901760 bytes
2 heads, 4 sectors/track, 1048560 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/md11: 1000.2 GB, 1000203747328 bytes
2 heads, 4 sectors/track, 244190368 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/hdd-data: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/ssd-usr: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 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: 0x00000000
Disk /dev/mapper/ssd-var: 15.0 GB, 15032385536 bytes
255 heads, 63 sectors/track, 1827 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: 0x00000000
Disk /dev/mapper/ssd-home: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 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: 0x00000000
在这里我看到了我有多少个物理卷
[root@u17669867 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/md11 hdd lvm2 a-- 931.51g 927.51g
/dev/md3 ssd lvm2 a-- 217.57g 195.57g
这里我尝试添加一些空间，例如 10G 到我正在使用的磁盘
[root@u17669867 ~]# lvextend -L +10 /dev/md1
Path required for Logical Volume "md1"
Please provide a volume group name
Run `lvextend --help' for more information.
[root@u17669867 ~]#
但我不是专业人士，也不知道在哪里添加空间……只要我的网页内容存储在 /var/www/ 目录中即可。所以我可能必须将磁盘安装到该目录，因为正如我从这里看到的：
[root@u17669867 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md1 4.0G 2.7G 1.4G 67% /
/dev/mapper/ssd-var 4.0G 2.7G 1.4G 67% /
/var 上没有挂载任何内容
如果可能的话，请帮助我。
答案1
您有一个“md11”磁盘，这可能意味着您在盒子上安装了软件 raid。好消息是，您在主磁盘上获得了大量空间 1T，SSD 驱动器上获得了 256GB。
您应该粘贴您的 fstab、lvs 的输出和 mount 的输出。
解决空间问题最简单的方法是
lvcreate -L 10G -n var_www hdd
mkfs.ext4 /dev/mapper/hdd-var_www
在 fstab 中添加以下行：/dev/mapper/hdd-var_www /var/www ext4 defaults 0 1
然后输入 mount /var/www 来检查您编辑的 fstab 是否正确。
或者，如果 lvs 和 mount 的输出确认你的斜线位于 lv 上，你可以输入
lvextend -L +10G /dev/mapper/<vg-lvname>
并使用与 fs 对应的文件系统工具命令，将 fs 大小增加到分区大小，对于 ext2,3,4 来说，它将是
resize2fs /dev/mapper/<vg-lvname>