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Questions tagged [device-mapper]

The device mapper is a block layer component which allows the creation of virtual block devices. LVM2 is based on it.

1
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0answers
379 views

Mount success but property of device mapper that dmsetup create is lost

I tried to create device mapper with dmsetup as followed: dmsetup create error_disk 0 20000 linear /dev/loop0 0 20000 1 error 20001 20959 linear /dev/loop0 20001 Then I check with command below: dd ...
4
votes
1answer
2k views

Cannot mount LVMm: resume ioctl on failed

I wanted to resize my LVM, followed some tutorial on the net and the system totally crashed (I got some boot error with UUID not found). I ran a LiveCD and tried to at least recover some files but I ...
2
votes
0answers
445 views

About dev mapping of partitions

New Linux user. Today had bright idea of making a backup of two partitions on an sd card to another sd card already in use. Did this: shrunk partition on backup sd, thus creating unallocated space, ...
1
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0answers
44 views

opening old external encrypted partition: error

I have an encrypted hard disk with luks encryption. When I try to open it via: cryptsetup luksOpen /dev/sdc1 backup It prompts me for a password, but then errors out on me: device-mapper: reload ...
6
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2answers
2k views

remap read-only LUKS partition to read-write

cryptsetup can be invoked with --readonly or -r option, which will set up a read-only mapping: cryptsetup --readonly luksOpen /dev/sdb1 sdb1 Once I have opened a device as read-only, can I later re-...
5
votes
1answer
223 views

How do I temporarily extract a flash drive or HDD in Linux?

Suppose I mounted a disk in this way: mount /dev/sdb /mnt/tmp I have some files opened on this filesystem and don't want to unmount it. However I want to temporarily extract the device, then ...
3
votes
1answer
566 views

RAID-1 mirror has become a single hard disk

I have an HP N40L microserver, with 2 identical drives, I used the system to hardware-RAID them as a mirror. I then installed mint on the system about a year ago. This has been running perfectly, ...
3
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0answers
150 views

Device mapper target to “change” sector size?

I'm wondering if there exists a device mapper target that I can use to make a device appear to have a different sector size. For example, let's say I set the "virtual" sector size to 448; then, every ...
13
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1answer
2k views

Why are there two different values for the size of a drive and how to reconcile them with device-mapper and LVM?

I have a 1 TB drive attached via USB. It contains an LVM physical volume filling the entire device (without any partition table). When I tried to extend a logical volume by using the entire PV, the ...
6
votes
1answer
5k views

GNU/Linux: “device mapper: create ioctl failed” “device or resource busy”

I can't mount my encrypted devices anymore. The error is: device mapper: create ioctl failed device or resource busy This error arises both with two different programs to access TrueCrypt ...
4
votes
2answers
11k views

device mapper on RHEL6 unable to create devs for LVM logical volume

I have XEN guest running RHEL6, and it has a LUN presented from the Dom0. This contains an LVM volume groups called vg_ALHINT (INT for Integration and ALH is an abbreviation of its Oracle database ...
1
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0answers
1k views

dm snapshot - how does it work?

Fedora uses dm-snapshot for making the root filesystem read-write. At least for me, when running a livecd (even without touching it), it will become unusable relatively quickly meaning it has ...
1
vote
1answer
755 views

Can we create lvm volume group with mapped device?

I can create a lvm volume group with a loop device. But if I use dmsetup to map the loop device into several devices, then I can't create a lvm group with /dev/dm-. Why is it not possible to create ...
4
votes
3answers
21k views

list the devices associated with logical volumes without using lvm2 package commands

I want to list all the physical volume associated with logical volume. I know lvdisplay, pvscan, pvdisplay -m could do the job. but I don't want to use these commands. Is there any other way to do it ...