nmon中看到磁盘如dm-0..dm-4。如果分区时使用了LVM，则一般生成dm-N逻辑卷。它类似于普通分区的一个分区sda0。只不过它利用了Mapper Device机制，在Physical Volume上虚拟出来的分区信息。
查看映射关系
[root@hpcentos1 ~]# cd /dev/mapper; ll
total 0
crw-rw---- 1 root root 10, 58 Dec 27 10:32 control
lrwxrwxrwx 1 root root 7 Dec 27 10:32 vg_hpcentos1-LogVol03 -> ../dm-4
lrwxrwxrwx 1 root root 7 Dec 27 10:32 vg_hpcentos1-LogVol04 -> ../dm-3
lrwxrwxrwx 1 root root 7 Dec 27 10:32 vg_hpcentos1-LogVol05 -> ../dm-2
lrwxrwxrwx 1 root root 7 Dec 27 10:32 vg_hpcentos1-lv_root -> ../dm-0
lrwxrwxrwx 1 root root 7 Dec 27 10:32 vg_hpcentos1-lv_swap -> ../dm-1
查看DM上的文件系统
[root@hpcentos1 mapper]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_hpcentos1-lv_root 50G 3.0G 44G 7% /
tmpfs 48G 336K 48G 1% /dev/shm
/dev/sda1 485M 37M 424M 8% /boot
/dev/mapper/vg_hpcentos1-LogVol03 193G 12G 171G 7% /home
/dev/mapper/vg_hpcentos1-LogVol04 1.6T 901G 651G 59% /opt
/dev/mapper/vg_hpcentos1-LogVol05 45G 6.8G 36G 16% /usr
查看磁盘分区与LVM
[root@hpcentos1 mapper]# fdisk -l
Disk /dev/sda: 3000.5 GB, 3000513552384 bytes
255 heads, 63 sectors/track, 364791 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 262144 bytes / 786432 bytes
Disk identifier: 0x0000b2de
Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512256 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 267350 2146970112 8e Linux LVM
从上面可以看出，sda2就是lvm对应的分区
如果觉得《linux查看映射文件关系 Linux磁盘映射DM》对你有帮助，请点赞、收藏，并留下你的观点哦！
