我对 lvm 有一个（非常）粗略的了解，但我发现掌握循环设备有点困难。无论如何，这是我的问题：
有人为我运行了 Ubuntu 服务器安装，可能使用了所提供的任何默认 lvm 设置。我现在需要修复这个问题。该服务器有两个 146GB 的物理驱动器。最初的意图是在一个分区上设置一个大约 100GB 空间的 raid-1。
相反，我得整理一下乱七八糟的东西。以下是一些信息：
fdisk -l （不是很清楚，见下文）：
Disk /dev/sda: 146.8 GB, 146778685440 bytes
255 heads, 63 sectors/track, 17844 cylinders, total 286677120 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0006e6c2
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 499711 248832 83 Linux
/dev/sda2 501758 286676991 143087617 5 Extended
/dev/sda5 501760 286676991 143087616 8e Linux LVM
Disk /dev/mapper/nmk203-root: 77.8 GB, 77791756288 bytes
255 heads, 63 sectors/track, 9457 cylinders, total 151937024 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/nmk203-root doesn't contain a valid partition table
Disk /dev/mapper/nmk203-swap_1: 68.7 GB, 68706893824 bytes
255 heads, 63 sectors/track, 8353 cylinders, total 134193152 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/nmk203-swap_1 doesn't contain a valid partition table
Disk /dev/mapper/loop0p1: 20.0 GB, 19998967808 bytes
255 heads, 63 sectors/track, 2431 cylinders, total 39060484 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/loop0p1 doesn't contain a valid partition table
Disk /dev/mapper/loop0p2: 1023 MB, 1023410176 bytes
255 heads, 63 sectors/track, 124 cylinders, total 1998848 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/loop0p2 doesn't contain a valid partition table
Disk /dev/mapper/loop2p1: 20.0 GB, 19998967808 bytes
255 heads, 63 sectors/track, 2431 cylinders, total 39060484 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/loop2p1 doesn't contain a valid partition table
Disk /dev/mapper/loop2p2: 1023 MB, 1023410176 bytes
255 heads, 63 sectors/track, 124 cylinders, total 1998848 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/loop2p2 doesn't contain a valid partition table
parted /dev/sda 打印全部：
Model: HP LOGICAL VOLUME (scsi)
Disk /dev/sda: 147GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 1049kB 256MB 255MB primary ext2 boot
2 257MB 147GB 147GB extended
5 257MB 147GB 147GB logical lvm
Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/loop2p2: 1023MB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Number Start End Size File system Flags
1 0.00B 1023MB 1023MB linux-swap(v1)
Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/loop2p1: 20.0GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Number Start End Size File system Flags
1 0.00B 20.0GB 20.0GB ext4
Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/loop0p2: 1023MB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Number Start End Size File system Flags
1 0.00B 1023MB 1023MB linux-swap(v1)
Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/loop0p1: 20.0GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Number Start End Size File system Flags
1 0.00B 20.0GB 20.0GB ext4
Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/nmk203-swap_1: 68.7GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Number Start End Size File system Flags
1 0.00B 68.7GB 68.7GB linux-swap(v1)
Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/nmk203-root: 77.8GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Number Start End Size File system Flags
1 0.00B 77.8GB 77.8GB ext4
fstab：
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
/dev/mapper/nmk203-root / ext4 errors=remount-ro 0 1
# /boot was on /dev/sdb1 during installation
UUID=26b5157b-8db8-47f3-a8ec-398e92d5e4cf /boot ext2 defaults 0 2
/dev/mapper/nmk203-swap_1 none swap sw 0 0
山：
/dev/mapper/nmk203-root on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
cgroup on /sys/fs/cgroup type tmpfs (rw,relatime,mode=755)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu type cgroup (rw,relatime,cpu)
cgroup on /sys/fs/cgroup/cpuacct type cgroup (rw,relatime,cpuacct)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,relatime,freezer)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,relatime,blkio)
/dev/sda1 on /boot type ext2 (rw)
/dev/dm-2 on /tmp/tmpq2vQ64 type ext4 (rw)
/dev/dm-4 on /tmp/tmptlvPgg type ext4 (rw)
DF-H：
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/nmk203-root 72G 5.1G 63G 8% /
udev 32G 4.0K 32G 1% /dev
tmpfs 13G 316K 13G 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 32G 0 32G 0% /run/shm
cgroup 32G 0 32G 0% /sys/fs/cgroup
/dev/sda1 228M 54M 162M 25% /boot
/dev/loop1 19G 630M 17G 4% /tmp/tmpq2vQ64
/dev/loop3 19G 630M 17G 4% /tmp/tmptlvPgg
所以我的第一个问题是。这些循环设备安装在 /tmp 文件夹中是什么？我可以简单地删除它们并使用 / 中的空间吗（或者不是因为交换等）？我该如何减少其他分区以向 / 添加空间（并最终进入原始 raid-1 计划）？我宁愿避免此时重新安装（如果可能的话）。
提前致谢