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What is Dev Mapper?
The device mapper is a framework provided by the Linux kernel for mapping physical block devices onto higher-level virtual block devices. It forms the foundation of the logical volume manager (LVM), software RAIDs and dm-crypt disk encryption, and offers additional features such as file system snapshots.
How do I find my dev Mapper?
How to map /dev/mapper/mpathY device from /dev/dm-Z device
- To determine which /dev/mapper entry corresponds to this /dev/dm-* entries, run the following ls command:
- Now, examine the friendly names for these devices.
- The fifth and sixth fields are the device major and minor numbers.
What is the use of multipath command?
You can use the -l and -ll options of the multipath command to display the current multipath configuration. The -l option displays multipath topology gathered from information in sysfs and the device mapper.
What kind of partition is in / Dev / mapper?
1 Answer 1. The entries in /dev/mapper are LVM logical volumes. You can think of these as Linux’s native partition type. Linux can also use other partition types, such as PC (MBR or GPT) partitions. Your disk is divided in MBR partitions, one of which (/dev/sda2) is an LVM physical volume.
What kind of device is in / Dev / mapper?
The server in question is using Logical Volume Manager (LVM), which is a vastly superior way to manage storage space compared to just creating regular partitions with file systems on various disks. The devices in /dev/mapper are Logical Volumes.
Why does fdisk-l not find a partition table?
It’s technically possible, albeit highly unusual and rather pointless, to have PC partitions inside an LVM logical volume, so fdisk -l looks there and reports that it doesn’t find a partition table. This is normal. On Ubuntu, you wouldn’t see anything about the LVM logical volume if the volume group is not activated.
How to add space to / Dev / sda5?
When running fdisk -l i can see that ive successfully added the new space to /dev/sda5. You can see that here: