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

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45
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Does LVM impact performance?

I have to migrate a few servers to Linux, and one important aspect that I need to evaluate is that my new host system must have elastic storage capacity. Naturally, doing some basic research, I came ...
25
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6answers
16k views

SSH to decrypt encrypted LVM during headless server boot?

When I installed Ubuntu 10.04 and, now, 10.10, I was offered the option of enabling "encrypted LVM" for my hard drive. After choosing that option, I am prompted for my password during boot to decrypt ...
15
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4answers
4k views

The merits of a partitionless filesystem

I ran into something a couple of weeks ago that I'd never seen before: A filesystem (ext3 I believe) installed to a storage device without a partition. In essence /dev/sdb was the entire filesystem. I ...
14
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7answers
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Should LVM partitions be used in virtual machine images?

Should LVM be used for the partitions when creating VM images (e.g., KVM images)? It seems like it adds complexity if you want to, say, mount a qcow2 image in the host if the image has LVM partitions. ...
13
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2answers
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How to reduce Volume Group size in LVM?

[root@localhost ~] vgdisplay --- Volume group --- VG Name vg_root System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 7 VG ...
11
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1answer
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How to create a read-only snapshot in LVM, and then rollback to it after some work?

What are the commands to use in LVM in case I want to: create a read-only snapshot of a volume; (do some experiments in the volume); and then rollback the volume to the snapshot?
11
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1answer
5k views

Using a LVM partition as a Virtualbox drive

Is it possible to use a LVM partition as a Virtualbox disk? I can't find any option to use a device as a Virtualbox disk, only disk images.
10
votes
4answers
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lvm devices under /dev/mapper missing

I'm using Debian squeeze, and running LVM on top of software RAID 1. I just accidentally just discovered that most of the links under /dev/mapper are missing, though my system seems to be still ...
10
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3answers
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Trim with LVM and dm-crypt

I tried to setup TRIM with LVM and dm-crypt on ubuntu 13.04 following this tutorial: http://blog.neutrino.es/2013/howto-properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/ See the ...
10
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1answer
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Defragmentation of LVM2 logical volumes

Question: Is there a tool supporting de-fragmentation of LVM2 logical volumes ? (Making their extents into consistent sequences) Preferably by defining desired order of extents (something like ...
10
votes
1answer
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Leaking file descriptors

What does it mean if file descriptor leaking File descriptor 6 (socket:[901758]) leaked on lvextend invocation. Parent PID 10035: /bin/zsh File descriptor 9 (/dev/pts/1) leaked on lvextend ...
9
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2answers
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Choosing filesystem for a 16TB Raid

I'm just putting together a machine with eight 2TB disks. I will be using Raid 6 (12TB of usable capacity) on top of them, but I'm not sure whether I should make LVM on top of the RAID, or what ...
8
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5answers
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Is it possible to put root in LVM without using initrd?

I have just set up a Gentoo base system (which means I can boot and log in and do stuff with it now). My root partition is in an LVM2 virtual group (with a separated /boot partition). In order to boot ...
8
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3answers
5k views

How can I check for bad blocks on an LVM physical volume?

When you're using ext4, you can check for badblocks with the command e2fsck -c /dev/sda1 # or whatever. This will "blacklist" the blocks by adding them to the bad block inode. What is the equivalent ...
8
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1answer
6k views

Updating disk free size without rebooting the host

I use RHEL4 with LVM2 on it. At times even after removing large files more that a GB the partition size is not getting updated when is see using df command. -bash-3.00$ df -h Filesystem ...
7
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3answers
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What is the best practice for adding disks in LVM

According to the Linux manpages you can add raw disks as well as partitions to a volume group. In other documentation (RedHat, CentOS or openSUSE), all examples refer to adding partitions to the VG ...
7
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3answers
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Any reason for encrypted /?

I am a big fan of linux and like trying out new distros now and then. I usually have my home folders and roots in a lvm atop an encrypted partition, but this tends to become cumbersome with every ...
7
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5answers
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Arch GRUB asking for /run/lvm/lvmetad.socket on a non lvm disk

I am running this script based on the ArchWiki setup procedure. It fails on the GRUB configuration step I am using the archlinux-2013.12.01-dual.iso inside VMware Player with 1 GB ram, sda is 810 ...
7
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5answers
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Partition manager that can handle LVM?

I have been looking but neither Gparted nor KDE Partition Manager can handle LVM. Working with the command line is probably fine but it would be clearer to have a GUI tool here. Does such thing exist? ...
7
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2answers
1k views

RAIDing with LVM vs MDRAID - pros and cons?

In his answer to the question "mixed raid types", HBruijn suggests using LVM to implement RAID vs the more standard MDRAID. After a little investigation, it seems LVM also supports RAID ...
7
votes
1answer
329 views

Do LVM snapshots ultimately cause fragmentation?

I'm planning on using LVM in order to be able to take atomic snapshots of large files and rsync them to a remote site. What I'd like to know is whether there is any long-term impact on the main ...
7
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1answer
2k views

LVM + LUKS + SSD + Gentoo — making it all work together

I'm finding a lot of conflicting information out there, and as of yet haven't found anyone trying to pull together all of the components that I'm trying to do, so I'm hoping someone who understands ...
7
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2answers
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Can't resize lvm volume “lv_home is in use. e2fsck: Cannot continue, aborting” [closed]

I would like to shrink my logical volume for home directory, so that I can extend volume for root. df -h /dev/mapper/vg_mitoscomp-lv_root 50G 33G 15G 70% / /dev/mapper/vg_mitoscomp-lv_home ...
7
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0answers
315 views

Couldn't fill logical volume maps [closed]

So I have a big problem here. On our server, there is an LVM raid with one volume group called raid. It contained two volumes, secured and unsecured and some unallocated space. Today I tried to remove ...
6
votes
4answers
2k views

Any good LVM tutorial?

I'm planning to user LVM in my next Linux installation, any links to good LVM tutorials/guides/FAQs would be welcomed.
6
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3answers
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Mapping between logical and physical block device names

I cannot figure out the mapping between different logical and physical block device names. The output of "cat /proc/diskstats" is : 104 0 cciss/c0d0 ... 104 1 cciss/c0d0p1 ... 104 2 ...
6
votes
3answers
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How do I combine two logical volumes that reside on a single physical volume in LVM?

I have two logical volumes, one is mounted as /, the other is mounted as /home. I want to combine them, because the / volume is constantly running out of space. (Yes, I know what's using all that ...
6
votes
1answer
650 views

Determining LVM Extent numbers for given file

I'm currently engaged in a non-work related homework exercise. I have an ext4 filesystem sitting on a logical volume. I'm testing different performance tuning strategies and this idea occurred to me. ...
6
votes
3answers
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merging LVM volume groups

Situation: I have a server with 4 1TB drives in LVM as shown below. The server is a openvz hardware node with a dozen or so openvz containers. At this time each container uses one disk only. This ...
6
votes
2answers
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How can I resize my root partition in Debian?

I am trying to add space to my root partition and am really not sure the safest way to go about it. I have read this thread, Can I resize the root partition without uninstalling and reinstalling ...
6
votes
1answer
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How to set keyboard layout used to enter password on an encrypted filesystem?

After my upgrade to Debian 6 (Squeeze), the keyboard layout used to enter the password of encrypted filesystem has been changed. How can I revert it back to previous one? My understanding is that, ...
6
votes
1answer
6k views

How to configure a filesystem+LVM for effective usage of SSD?

ext4 is one of the filesystems recommended for using on SSDs (with a number of built-in techniques and advices how to tune it for better performance and wear-levelling of SSDs). I want to install a ...
6
votes
1answer
638 views

Linux device-mapper & ext4: what happens when the COW table fills up?

Consider the following scenario: I use Linux device mapper to create a snapshot of an ext4 file system. The snapshot is mounted as read-only; the source volume is mounted as read-write. I read the ...
5
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5answers
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Consumer Level software RAID5 and LVM

Hi I am going to build a 6 drive consumer level RAID 5 (10TB) with Ubuntu10.10 and using EXT4 as filesystem, and OS on another drive. Question: Should you use LVM on top of the RAID5 or should just ...
5
votes
2answers
210 views

Where does LVM store its configuration?

I am trying to understand how / where LVM stores its configuration data. Does pvcreate /dev/sdb write any metadata to /dev/sdb? if so what is written? Where does vgcreate data /dev/sdb /dev/sdc ...
5
votes
3answers
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mdadm with overlaying lvm - remove a hard drive

This is a hypothetical question, I'm just evaluating in which way I should configure my hard drives for my home-server and for that I need to know this: Let's say I have a Raid5 configured with mdadm ...
5
votes
2answers
4k views

Permanently changing the ownership (or group) of LVM volume

How can I permanently change the ownership (or at least the group) of a LVM volume? I figured that I have to use udev, but I don't know how the rule should look like? Let's say I want to change the ...
5
votes
2answers
295 views

Slow access to btrfs on LVM/

We have this setup on our server: Ubuntu 14.04 (used to be 12.04) 10TB RAID-6 system LVM (one VG, two LV) ext4 partition ( ~2TB) Btrfs partition ( ~8TB) After a reboot last month the system was ...
5
votes
4answers
715 views

How to identify LVM-over-LUKS or LUKS-over-LVM

I recently installed Fedora 20. I don't recall what exact options I chose for encrypting the disk/LVM during installation. It installed fine and I can log in etc. Here is the situation I have: I ...
5
votes
2answers
2k views

Does swap need to be on a contiguous LVM logical volume

I am setting up a machine to run a number of virtual machines. I am using a single HDD with a boot partition and an LVM partition. I read on the Arch wiki that logcial volumes which will be used for ...
5
votes
3answers
879 views

How does LVM find drives after setup

I want to move all my 14.5 TB of media drives (not OS) to a combined LVM file system due to constant problems arranging things to fit into multiple smaller file systems. My question is if after setup ...
5
votes
2answers
3k views

Does LVM increase the risk of data loss?

Let's say I have two identical disks, and I set one LVM logical volume on them (no mirroring). Question: What will happen when one of the disks fails? I will lose all the data from all the disks I ...
5
votes
1answer
1k views

Can LVM snapshots be writable? (and used for temporary experiments)

It seems that usually it is talked about snapshots as read-only. (In a scenario where one creates a snapshot, then does some experiments with the main volume, and then restores the old state by ...
5
votes
2answers
317 views

Choosing the file system to use with LVM

Since I found out about LVM I have been giving more thought to the process for choosing the file system for my future installs. Usually I'd always choose whatever default option the distro would ...
5
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1answer
656 views

Alternatives to LVM

I was thinking about alternatives to combine several HDDs together. The only options I know so far are using LVM and/or RAID. The thing is, using LVM, I will most probably lose all data, if one ...
5
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1answer
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Logical volume missing after reboot

Centos- 6, LVM2 after a system hang and hard reboot. lvdisplay and lvscan return no volumes. It had volumes earlier...how to recover? there is data on LV (logical volume) - shared as NFS export.. ...
5
votes
1answer
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Why my encrypted LVM volume (LUKS device) won't mount at boot time?

I'm trying to setup an encrypted volume following this guide Everything is setup but mounting the encrypted volume fails at boot-time with the error: fsck.ext4: No such file or directory while ...
5
votes
2answers
4k views

/dev/md127 refuses to stop. No open files

So I'm trying to stop /dev/md127 on my Ubuntu 12.10 box. It was set up as RAID1, but I'm trying to move everything (well, rename) to md0. I read that renaming isn't possible, so I'm trying to remove ...
5
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1answer
95 views

LVM: is this mirrored? is copy this slow?

Background: My Windows Home Server bit the dust - some kind of OS Hang. The drives and hardware were still good; after making sure I had all my data backed up, I decided to investigate Ubuntu and ...
5
votes
1answer
1k views

NFS server causes high load even when idle

I have an Ubuntu (12.04) NFS server that has a high load (larger than 10) even when nothing is running. In detail, the storage is provided by an iSCSI device, on which I have 5 logical volumes (LVM) ...