Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [device-mapper]

30 questions
1
vote
1 answer

using same LVM volume for devicemapper and a bind mounted volume

I'm running an Amazon EC2 machine with a 512GB EBS mount. My plan is to split the EBS into two parts - one to be used by Docker 1.11 for its images (via devicemapper) and another to be bind-mounted to the docker VM (for storing some big pieces of…
Sandeep
  • 117
  • 4
1
vote
0 answers

Is it possible to extend the data device of an Thin Provision pool setted by device mapper?

TL;DR : How can I extend the Thin-Pool if I'm not using LVM but Device Mapper itself directly? Detailed version: As far as I know, when we create a thin-pool by dmsetup, we can set a low_water_mark; once the watermark is reached, a dmevent will be…
Ruinland
  • 11
  • 3
1
vote
0 answers

dmcache - is removing cache device without suspending safe?

I'm using plain dmcache for SSD cache - unmount procedure goes this way: umount fs suspend cache device remove cache device close lvm close LUKS shutdown However sometimes dmsetup doesn't allow me to remove cache device throwing Device busy error,…
Lapsio
  • 363
  • 1
  • 5
  • 15
1
vote
0 answers

Is it possible to migrate between two physical disks without (much) downtime?

I have a server with a medium-sized database on a disk which is filling-up. There is no LVM or RAID or anything like that in play at this point. I already have the new disk installed in the server. Is it possible to migrate the data to the new…
Christopher Schultz
  • 1,105
  • 2
  • 12
  • 22
1
vote
0 answers

cache_writeback of thin-provisioning-tools running failed

I use Ubuntu 16.04 with kernel 5.4 and thin-provisioning-tools version 0.8.5 I want to test the cache_xml and cache_writeback tools of thin-provisioning, but it failed. It always failed and I don't know how to debug. I have two SSD as RAID0 and use…
code_worker
  • 161
  • 6
0
votes
0 answers

sar -dp reports individual disks higher than their devicemapper logical volume

I am trying to figure out how sysstat is reporting the utilization of the device mapper logical volume, lower than the individual disks that make up the logical volume. I keep trying to do the math but I cant make sense of it. This is the…
cdiehl
  • 46
  • 4
0
votes
2 answers

How do you specify how much disk space for each mount point on vsphere?

I created a vm via the vsphere web client. The ESX version is 6.5 and the vsphere version is also 6.5 Via the menu: create virtual machine Option 2f: customize hardware Virtual Hardware: New Hard disk I selected 128GB and created my vm But when I…
ARL
  • 105
  • 3
0
votes
1 answer

Seeing Multiple Partition for same LUN

Anyone knows why I am seeing multiple device for the same LUN?I checked with storage team they only exposed 360000970000196801239533036304532 for this server but why I am seeing these many partition(p1..p7) lrwxrwxrwx 1 root root 8 Jan 20…
Prashant Lakhera
  • 713
  • 2
  • 10
  • 25
0
votes
1 answer

duplicate entries /dev/mapper

The system is Fedora 23. This occurred after a system upgrade. The issue is duplicate entries in /dev/mapper. As seen by /dev/mapper each partition is represented twice. How can the device based names be removed? ls /dev/mapper…
dan sawyer
  • 141
  • 2
  • 12
0
votes
0 answers

Linux, dev-mapper: How to mount a folder with different options than parent folder

I'm using CentOS 7.1 with device-mapper, and /home mounted as /dev/mapper/centos-home on /home type xfs (rw,relatime,seclabel,attr2,inode64,noquota) I'd like to include in fstab an entry for mounting /home/xyz with different options than those for…
Diego Shevek
  • 133
  • 5
0
votes
0 answers

How to get rid of “Duplicate IMA measurements will not be recorded in the IMA log.”?

In the journal of my Debian 12 kernel linux-image-6.1.0-10-amd64 version 6.1.37-1 I discovered the following lines: … … hostname systemd[1]: Starting systemd-journald.service - Journal Service … … hostname kernel: device-mapper: core:…
AlMa0
  • 101
0
votes
0 answers

Some "dispappered" dm-? files under the /dev directory

Recently I took over a few RHEL systems running with the native DM-multipath, which had been installed & configured by other persons. My doubts focus on the following questions: 1). Why there would only a part of dm-? files from dm10~dm19 under the…
lylklb
  • 3
  • 3
0
votes
1 answer

use mount with LUKS2

Back in times of LUKS1, it was possible to use a command like $ mount /dev/luks-encrypted-partition /mnt/a [enter passphrase upon being prompted] as a shortcut for $ cryptsetup luksOpen /dev/luks-encrypted-partition some-name $ mount…
LaTechneuse
  • 161
  • 6
0
votes
0 answers

What are the best practices for device-mapper multipath?

Background: We are setting up the new storage for an HPC Compute cluster for applied statistics, bioinformatics, and genomics. Contrary to our expectations, an active-active configuration did not improve I/O performance compared to failover under…
Nicolas De Jay
  • 209
  • 2
  • 11
-3
votes
1 answer

VMWare device mapper size smaller than parition size

I am trying to understand what is going on with my VMWare instance. I have had 50GB partition that I extended to 150GB and resized the partition. However, the partition still shows that it only has 50GB size. Here is a screenshot from GParted: Here…
Gasim
  • 977
  • 4
  • 14
  • 23
1
2