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

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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 ...
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How to Expand LVM2 Partition in Fedora Linux

I've been using Fedora 15 on a VMWare virtual machine. Over time, the disk space I initially allocated for the file system began to run out, only 12GB left. I've expanded the disk space an extra 25GB. ...
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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 ...
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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 ...
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RHEL6 LUKS with TPM support?

I'm surprised that this question is not asked more frequently, but (in RHEL) does LUKS support TPM's the way that Windows BitLocker does? If so, how is this feature implemented, and does it provide ...
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Is it sensible to use multiple LVM layers with mdraid

I'm building up a home server that will be used for a handful of different things. I'd really like to try a Btrfs raid 1 array for a large data store, but I'm using CentOS 7 (older kernel although ...
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Resize a btrfs partition inside a logical LVM volume

Following derobert's trick to resize the underlying filesystem when resizing a LVM volume: lvm> lvextend -r -l +100%FREE /dev/VolGroup00/lvolhome fsck from util-linux 2.25.2 /sbin/fsck.btrfs: ...
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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 ...
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Define physical volume inside non-partitioned disk

I've been able to define a physical volume (LVM) in two ways: Creating a 8e (Linux LVM type) partition and then # pvcreate /dev/sdb1 Usign pvcreate directly using a non-partitioned disk and then # ...
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“Found duplicate PV”

SERVER:~ # pvs Found duplicate PV Wb0b2UTCKtpUtSki0k2NnIB24qNj4CEP: using /dev/mapper/36005076304ffc2500000000000004903 not /dev/mapper/36005076304ffc2990000000000004903 PV ...
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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 ...
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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 ...
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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 ...
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Is there any performance penalty to having multiple segments for one volume in LVM?

We have a big drive that we've split up using LVM. We allocated one segment to the root filesystem and several other segments to other filesystems. Then we wanted to add more space to the root ...
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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.. ...
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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 ...
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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) ...
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Why do some of my lvm partitions have “-real” appended to their names?

In the /dev/mapper directory I can see my lvm partitions, but then I'll see some other ones with the same names, but with "-real" appended to them. What's that about?
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How to resize an LVM partition at the beginning

I have resized lvm partitions in the past, but after the resize there is space at the end of the partition. What I want to achive is to have the space at the beginning of the partition instead. The ...
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How does grub2 load the kernel from an LVM volume?

Grub2 is able to load the kernel even if /boot is placed on an LVM volume. To use this feature one needs to add insmod lvm (the module can be on the grub bios partition that is not on an LVM volume) ...
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How can I find out the free space on an LVM PV in human readable format?

I'm looking for a way I can get the free space on an LVM physical volume without having to use a calculator. I know the pvdisplay command will show me the size of a PE size as well as the free PE, ...
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Partitioning a 2tb drive

Im new to linux Im planning to install Squeeze on a 2tb hard drive a follows: / - 10gb swap remaining space will contain /home, around 1.9tb i hope, i will try to use as lvm to add my old 1tb drive ...
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Move logical volume to a new physical disk

I have three logical volumes in a single volume group using a single physical volume (the whole existing disk /dev/sda). I now want to move one of those logical volumes to a new, faster disk, i.e., ...
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Must the filesystem be unmounted while extending an LVM logical volume?

I have seen some tutorials on extending an LVM2 logical volume. None of them instruct you to unmount the filesystem. They claim that you can extend an LVM volume while it is in use. Is this right?
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LVM with SSD and SATA hard disks

Is it possible to create LVM partitions for both SSD and SATA hard disks? I mean if there isn't any conflicts.
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Which device is using this logical volume?

I'm trying to remove an LVM logical volume, which I believe is not currently in use. However, when I attempted to remove it, I get an error: # lvremove /dev/vg_service1/lv_home Logical volume ...
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218TB XFS LVM filesystem. 144TB Free. Error message “No Free Space Left on Device”

I have a giant 218 TB RAID6, across LVM. It is actually 2 separate RAID6s joined together through LVM to form one giant RAID6. df -h shows all space was available, and I mounted to /share. I wanted ...
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Grow LVM RAID10?

RHEL LVM has supported RAID4/5/6 as of 6.3 and RAID10 as of 6.4. It's well-known that mdadm won't let you --grow raid10, my question is whether this is a limitation of LVM RAID10 too? If it is ...
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CentOS can't use new extented space on system disc

I have CentOS installed in my VirtualBox and there was small HDD for the system itself(about 8-9GB). After some time of using this, this virtual disc got full and I couldn't install updates so I ...
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lvm: what's the purpose of a Volume Group?

Each Volume Group can have many resizeable Logical Volumes. each of Logical Volume can have different filesystem, encryption options etc. that means having a single Volume Groups is enough. so why LVM ...
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SSD as a read cache for FREQUENTLY read data

I'm looking for ways to make use of an SSD to speed up my system. In “Linux equivalent to ReadyBoost?” (and the research that triggered for me) I've learned about bcache, dm-cache and EnhanceIO. All ...
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How to Format an LVM partition

I need to format a partition. But I have one LVM on my machine (VirtualBox) that is composed of two different two partitions of two Virtual HDD's (sdb5 and sdc5) fdisk output df output
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Uninstall the Encrypted LVM function to remove the prompted password entry during Ubuntu Boot

When I installed Ubuntu 11.04 and 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 the LVM. ...
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How to stop caching a LVM partition?

I currently have LVM-cache set up on my Ubuntu install as described in https://rwmj.wordpress.com/2014/05/22/using-lvms-new-cache-feature/. (I did have to install some of the vivid/proposed packages ...
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LVM2 pvdisplay and vgdisplay disagree

In my laptop, I have a single hard drive (/dev/sda). On this hard drive, I have an EFI partition (/dev/sda1), a boot partition (/dev/sda2), and an encrypted partition containing / (/dev/sda3). Inside ...
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iSCSI device mapped to different SCSI device

I have an iSCSI disk array connected to a server (Ubuntu). When I login with iscsiadm -m node --login -p 192.168.1.240 the device used to appear as /dev/sdb. I created a volume group with LVM using ...
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Recovering overwritten LVM metadata

Yesterday I was trying using the Debian install in rescue mode in order to fix my Grub (The menu-item for Debian was suddenly gone). Now I wasn't able to fix it and didn't have a lot of time, so I ...
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Combine LVM logical volumes?

It's a server with 128GB SSD. There are two LVs, / and /home. I want to combine them into one since the space is limited. I checked the HOW-TO but didn't found the tutorial for this task. How can ...
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What filesystem has best support for shrinking?

Most mainstream filesystems can be grown fairly reliably, but what if I think I would like to shrink in future? XFS is a non runner. Reiser seems to have good support but gives scary BETA warnings , ...
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Resizing logical volume with no free extents but with free disk space

I have a 7.9 TB logical volume formatted with XFS filesystem. I have 8 1 TB RAID devices as physical volumes, and 1 volume group that contains all of these devices. I have 2.5 TB free space on my ...
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LVM Mirrored Logical Volume Performance

I read that when mirroring a logical volume a log of some sort is used to keep the files in sync. You can either set it so this log is in a separate physical volume or in memory. I also read that if ...
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Resize XFS home directory in LVM

I am desperately trying to increase the swap space available to my server from 4GB to 16GB, however at present XFS + something is making this impossible. I have a single SSD hosting the OS (CentOS ...
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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 ...
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Using LVM with SSD and SATA drives

I saw in this question that it is possible to place both a SSD and a standard SATA hard drive into a single LVM volume group (VG). How does this affect performance? Is there a way to force the OS ...
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I/O errors on Linux LVM

I have a CentOS 6 box with LVM setup and one of the PVs is a USB disk (I know). One of them is getting the error: Oct 30 10:57:07 alpha01 kernel: lost page write due to I/O error on dm-3 Oct 30 ...
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Install grub on LV container for VM

I'm having difficult time installing grub in LVM LV container for a VM. This is the partition table: # parted /dev/mgtvg/linux2os print Model: Linux device-mapper (linear) (dm) Disk /dev/dm-7: 129GB ...
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Create a volume group from a logical volume instead of a physical volume

Is it possible to create a volume group from a logical volume instead of a physical volume? If so, are there any pitfalls in doing so? Use case: Installing OpenStack Compute on a a system that ...
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Extending/resizing Fedora Guest-OS root-drive in VirtualBox

I hope you can help me with that: My VirtualBox Guest-OS (Fedora 19) told me, that there is not enough free disk-space availabe, so I first increased the .vdi-file by using the Windows-Commandline: ...
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Why does activation of LVM partition with large snapshot takes long time?

After creating large snapshot (I assume it drifted about 30GB from the original) I noticed that vgchange -ay took noticeable longer (to the point I thought computer hanged). What does the activation ...
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LVM cache and TRIM

I have set up LVM to cache a logical volume (located on an HDD) on a partition of an SSD (in writeback mode if this matters). As far as I can tell, this works correctly and the cache uses all ...