The “dmsetup” command is used to manage device mapper devices, by which we can create and manage virtual block devices on top of physical storage devices. It can also be used to create, modify, and remove device mapper devices, as well as to view information about existing physical devices.
- It is a command using which we can do low level logical volume management.
- It comes from “device-mapper-1.02.53” package.
- Path: /sbin/dmsetup
Examples:
1. To list the device mapper devices
| # dmsetup ls |
2. To get information about any DM device
| # dmsetup info /dev/VG00/LV00 |
3. To get DM device info in column wise
| # dmsetup info -c /dev/VG00/LV00 |
4. To list the DM device dependencies
| # dmsetup deps /dev/VG00/LV00 |
5. To get the status of a DM device
| # dmsetup status /dev/VG00/LV00 |
6. To destroy the inactive table for a device
| # dmsetup clear /dev/VG00/LV00 |
7. To send message to target.
| # dmsetup device_name sector message # dmsetup /dev/VG00/LV00 0 “My Logical device” |
8. To remove a device
| # dmsetup remove /dev/VG00/LV00 |
9. To remove all the devices
| # dmsetup remove_all |
10 To rename the device
| # dmsetup /dev/VG00/LV00 /dev/VG00/LV04 |
11. To suspend a device
| # dmsetup suspend –nolockfs /dev/VG00/LV00 # dmsetup suspend –noflush /dev/VG00/LV00 |
12. To un-suspend a device
| # dmsetup resume /dev/VG00/LV00 |
13. To output the table for a device
| # dmsetup table /dev/VG00/LV00 |
14. To get the dmsetup version info
| # dmsetup version |
15. To display the help information
| # dmsetup -h |
