Logical Volume Management provides storage abstraction, a generalization of disk partitioning.

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Swap /dev/mapper/* devices

I have been given a box that has /dev/mapper/root mounted as / and mapped to /dev/dm-0. It has /dev/mapper/home mounted as /home and mapped to /dev/dm-2. The dm-0 device is 5G and the dm-2 device is ...
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47 views

RHEL: FDE w/o password - boot from key on partition

I'm trying to accomplish encrypting my OS w/ LVM on RHEL 7.2 and have it boot without entering a password by using a key on an unencrypted partition. LV VG Attr LSize Pool Origin Data% ...
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94 views

md raid not mounted by dracut

Background I'm running Centos 7. Originally, it was running on a single disk that looked something like this: 1 200M EFI System (/boot/efi) 2 500M Microsoft basic (/boot) 3 465.1G ...
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36 views

One LVM volume across multiple mdadm arrays

I'm about to set up a new nas and basically want to know if it's a bad or a good idea to have one lvm volume on multiple mirrored mdadm arrays, kind of like raid 10. I thought this would make it ...
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49 views

LVM devices not showing in initrd but working on boot [duplicate]

I am currently working on a custom initrd based on the CentOS 6.7 (2.6) kernel with the following modules loaded. The initrd is designed to backup files off a old RHEL system into memory, unmount the ...
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80 views

how to create another physical volume/partition with existing unused lvm space without data loss?

I have a 1T USB disk with Fedora 20 installed. It shows as sdd in the first image below. I only used about 50GB. There are 3 logic volumes under the sdd2 and also there are about 620GB of free space ...
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242 views

Dependency failed for mount after dist-upgrade

Last weekend, I ran an apt-get dist-upgrade on a home Debian 8.3 system, and was surprised to see that it entered emergency mode on the next boot. The server in question runs LVM on top of a mdadm ...
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22 views

Is there any profit in using contiguous space in lvm?

When creating an LVM on linux, there's couple of options to set up. One of them is -C y, which sets contiguous space that a logical volume can use. Should I use this parameter or not? I know that you ...
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21 views

How to handle (with LVM or DM (device mapper)) when a drive has gone away and come back as a new block device

(This correct answer is to one that bears little surface resemblance to this one. Asking the question and answering it myself with reference to that one.) Consider a virtual host environment in which ...
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29 views

What is the order in which physical volumes are used in a volume group?

I have a volume group which contains 2 physical volumes 400g on a 7200rpm hdd 250g on an ssd. Can I ensure that the ssd is used first/ the hdd is only used when the ssd is full? Note I will have var ...
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37 views

Snapshot size in lvm

I am trying to understand how to select a proper size for snapshot. As I know simple snapshot uses space which is needed for covering difference between two logical volumes. So, what size of snapshot ...
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128 views

How to mount a logical volume?

I would like to mount /dev/sda2. How am I supposed to do that? I have tried this, I'm not sure about the result, df still does not show the free space. mount -v -o ro /dev/sda2 /data mount: unknown ...
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195 views

LVM drives have same pvid

I am trying to remove a corrupt drive from a LVM volume group but when I try to pvmove data I get # pvmove -v /dev/sda1 Cluster mirror log daemon not included in build. Found same device ...
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26 views

Removing drive from LVM that has the /boot partition

I have two drives /dev/sda and /dev/sdb that are in a Volume Group with three volumes: /boot, /root, and /home, mounted respectfully. If I remove /dev/sda after doing # pvmove /dev/sda # vgreduce ...
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84 views

Setting up OpenVZ container private area

I would like to install two OpenVZ templates, each one in a different logical volume. I have created a separate partition, made it a physical volume, assigned it a group volume and separated in two ...
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3k views

LVM unknown device: how to recover?

I have a server with two hard drives that I thought I had correctly installed with LVM, until I discovered that the second hard-drive did not actually seem to be used. I investigated the problem and ...
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398 views

What is the proper way to activate VGs/LVs automatically on boot?

I have used Buildroot to create a system that runs in RAM on my ARMv5 Kirkwood SoC -based NAS-box. I use BusyBox as my init system, and /dev management is done using devtmpfs only. I've selected LVM2 ...
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400 views

How to create an /opt partition on an existing installation without loosing data?

I've shrinked my /home from 2.7TB to 100G, I've extended /root, /usr, /tmp and /var but I have been looking for a way to create an /opt partition for 3 hours now, and can't find it. The setup is 3TB ...
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822 views

How can I remove a disk from a group with striped volumes?

I have an HP-UX B.11.11 system with two disks. I would like to remove one, but as far as I can divine, it seems that the volumes are striped across the pair and I can't figure out how to ...
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516 views

Duplicate UUID's for Physical Volumes But PV's aren't in a Volume Group

I have some dead/stale/non existent logical volumes without group pvs said File descriptor 3 (pipe:[306492]) leaked on pvs invocation. Parent PID 30844: -su Found duplicate PV ...
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4k views

resize root volume with lvextend insufficent space error

My root partition is running out of space, so I'm trying to extend/resize it. Filesystem Size Used Avail Use% Mounted on /dev/mapper/u64-root 19G 18G 823M 96% / none ...
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259 views

Built new kernel, LVM won't mount from initrd

I need to upgrade my kernel on a RHEL 5 system to build with some experimental drivers. I have configured the kernel with module loading for LVM (dm_* modules). Once the initrd runs the /init ...
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781 views

Debian Squeeze RAID 5 Install?

I have a box with four Hard Drives on it. I am going to install Debian Squeeze (I know it's old... I have to) on it. I want to be able to treat the the four Hard Drives as a single Harddrive. Durringt ...
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553 views

How do I recover an ext4 volume overwritten by an LVM logical volume?

I was running an Ubuntu desktop. The OS was installed on a SSD. I had two additional drives formatted ext4 and mounted on /storage (1TB) and /storage-bak (1.5TB). I installed Centos over Ubuntu on ...
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Restored VG has shifted volumes

I'm recovering a PV on a mdadm RAID 1 with a single VG containing several LVs. The underlying devices have several bad sectors (one just a few, the other really much) and a silly typo made it ...
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341 views

How to create LV

I want to create some LV in my VG I have this: LV Name /dev/vg_appli/lv_grt LV Size 10,00 GB LV Name /dev/vg_appli/lv_sap LV Size ...
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351 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 ...
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983 views

HPUX: changing LVM paths or disk device names

Our installed HPUX system has a VG called "vg00" whose data was stored in partition "/dev/dsk/c3t5d0s2" Now that disk failed and we have an exact copy of that disk. However when we use the new disk, ...
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155 views

How to add RAID5 to existing crypto-LVM?

I recently installed Debian Wheezy and let the installer guide partition the disk using a whole partition with encryption (LVM). Later on I've added four disks and setup RAID5 on them (using mdadm). ...
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785 views

Debian doesn't boot anymore

I use Debian Wheezy. Yesterday I added a new HDD to the system and expanded the LVM using the system-config-lvm gui-tool. I have a logical LVM group for root, /, and one for home, /home. I also ...
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223 views

When should I create a new volume group instead of a new logical volume?

I currently have 3x1TB physical volumes in a VG and a LV that spans the entire capacity of the VG. This LV is meant to store specific files. Now I have another 2TB drive that I want to use LVM with. ...
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939 views

How to resize root Volume Group

How Can I reduce size of root volume group? /dev/VolGroup00/LogVol00 I just have SSH access to Linux host.
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1k views

How to extend second CentOS 5 partition in VMware

I know this question has already been answered for a primary partition, but what about a secondary? I have extended the space to 30G in VMware. When I perform an fdisk -l, here's the output: Disk ...
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933 views

How do I attach my LVM RAID's to a new Ubuntu install?

I have an Ubuntu 9 Desktop system that I mainly use as a media server. I have a 2TB RAID5 and a 500GB RAID1, both using LVM. The OS drive is a 4GB CompactFlash card which has finally run out of space. ...
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24 views

Can I mix SAS and SATA HDDs together using LVM?

I was playing with my server with a 300G SAS HDD. However, recently I am considering making it into a production server which demands elastic storage. So I meet the question that whether it is okay to ...
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44 views

Ext4 corrupted and unrecoverable after LVM resizing + power failure

I have a completely standard, single hard drive Fedora 23 desktop. The dual-boot installer set up the Linux partition as LVM, with root, swap and home logical volumes; root and home were both ext4. ...
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29 views

How to wait for detected LVM volumes?

I have the following problem: I have a machine running arch and which contains a encrypted LV in a LVM. Inside the (encrypted) LV is another PV located. So I have in fact two VGs: One which contains ...
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Boot Entry for Loading Encrypted LVM

So, I recently installed Arch Linux (EFI) with the root folder in an encrypted LVM. I am loading the correct modules and hooks on startup, but it's telling me it can not load the encrypted space after ...
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48 views

bcache not working as expected with ramdisk as cache device

I was trying out bcache but i don't have an SSD so wanted to use free memory as a substitute. As ramdisk is listed in /proc/devices as block device i assumed this would work OK but with below simple ...
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68 views

Automatic unlock LVM partitions with a Key LUKS dm-crypt

I'm trying to make an automatic unlock of other partitions, I have 9 Logical volumes including root, and I know root LVM will unlock manually true password to have a key decrypted. My goal is unlock ...
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99 views

ArchLinux: Error installing grub on encrypted lvm partition(lvm on luks)

I am trying to install Arch Linux on an encrypted partition (LVM on LUKS). I followed the relevant Arch Wiki guide, but when I do: grub-install --recheck /dev/sda it gives me this output: ...
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53 views

LVM: How to clone thin-volume

I'd like to know how it's possible using the lvm cli tool to clone an existing lvm thin volume, creating another thin-volume with the same contents (but possibly a larger size) as the original one. ...
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51 views

Not able to finish setting up LUKS

I am trying to encrypt a new VM with LVM on LUKS. I formatted and partitioned the HD (1 partition). I ran: # cryptsetup -c aes-xts-plain64 -s 512 luksFormat /dev/sda1 /mnt/dok/31.jpg typing ...
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173 views

Why is OS constantly writing to disk (ext4) on a Ubuntu 14.04 machine? Is it normal?

I'm quite sure it didn't happen before I started using LUKS and LVM on my disk (2 or 3 weeks ago), but now root user is constantly (every 2-3 seconds) writing (not reading, just writing) on disk and I ...
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44 views

One SSD cache for two partitions on two separate disks?

I have two hard drives: one for my operating system and the other for other data. I recently bought an SSD drive that I would like to use an LVM cache for those two devices. The problem is that I ...
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58 views

Restoration of physical and logical volume group with data

My idea was to simulate such situation on VirtualBox as: some crash happened with my hard disk drive, but I had had LVM and it was not a big deal to restore data using it. My steps were: step1: ...
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74 views

When using dm-cache, how do you do snapshots on a cached LV?

In dm-cache, how do you do snapshots on a cached LV? I attempted the usual way on a CentOS 6.7 installation and got the following results:- # lvs LV VG Attr LSize Pool ...
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Backup location in LVM

By default, the metadata backup is stored in the /etc/lvm/backup file and the metadata archives are stored in the /etc/lvm/archives file. What should I do If I want to change directory for backup? For ...
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401 views

Backup partition in LVM using Clonezilla

I installed a Debian Jessie machine on a 1.4TB disk (technically a hardware RAID but this shouldn't matter). At installation, I created an unencrypted LVM with 3 volumes, including a 30 GB volume I ...
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Moved /var/log to a new logical volume now data is missing

I have a RHEL server that has /var mounted inside an LVG on its on dedicated LV. Per RH Security Advisory CCE-26215-4 I needed to migrate /var/log to its own dedicated partition. So I shrunk /opt to ...