In computer storage, Logical Volume Management or LVM provides a method of allocating space on mass-storage devices that is more flexible than conventional partitioning schemes.

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Increased virtual disk size (vid) but /dev/mapper seems to be unchanged

I run a webserver on a virtual box, which needed to be increased in disk size; so I expanded the vdi using vboxmanage command and repartitioned to full capacity. Now fdisk -l says what follows: ...
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237 views

Linux LVM: move free space from a volume group to another

I've just read "How can you re-allocate space from one Volume Group to another Volume Group in Linux?" How can you re-allocate space from one Volume Group to another Volume Group in Linux? But I'm ...
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28 views

Convert LVM logical volume to use striping?

I don't want to change the size of LVM, I just want it to use striping. We made LV on single volume, but now we want to migrate to 3 volumes, each smaller, but have the LVM stripe across all 3 of the ...
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334 views

Mount LVM in rescue mode

I am having trouble mounting a LVM to extract a Proxmox virtual machines data. Any ideas on how I can mount it? The data is on one of the two 2TB hard drives. I think they are RAID 1 root@rescue:~# ...
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58 views

Backup strategy for LVM file sytem on NFS file server connected to SAN

I have setup a server (CentOS) on which I have connected to several LUNs from a SAN via iSCSI then multipath, resulting in multiple physical volumes I can use for LVM (dm1 ...). From the file server, ...
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34 views

lvconvert number of mirrors

I have a logical volume that is mirrored, it has two copies of the data and also its log is mirrored. It was created using something like: lvcreate -m 1 --mirrorlog I am planning to move this data ...
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1answer
107 views

Fsck finds errors in OS, but not using LiveCD

Running fsck on a booted machine yields errors on the root file system. In an attempt to fix this, I booted from a LiveCD - but fsck on the LiveCD instance doesn't find any errors at all. I also tried ...
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73 views

Unable to mount “lvm2” volume

I had to reinstall CentOS on a system with a separate disk array for data. I installed on the OS disks and kept the other disk array as storage (so they were not formatted). When I try to mount the ...
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103 views

Bad sector on disk, part of a LVM over RAID1 array, which files are affected?

My RAID1 array /dev/md1 is rebuilding after one of the disks has been replaced. Problem : the source disk has Unrecoverable Errors, and my only choice if I do not want to lose the whole data set (no ...
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1answer
268 views

KVM: how to resize guest VM disk via LVM

on the Debian host nl-ams02c-kvm02 there is CentOS guest VM nl-ams02c-ispbgp02. i resized the corresponding LVM like : root@nl-ams02c-kvm02:~# lvextend -L +10000G /dev/raid50/nl-ams02c-ispbgp02 root@...
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16 views

LVM showing fuller than it is [duplicate]

I have a LVM setup on my server and recently it reported the partition /var as being full. I extended it and extended the file system to get over the immediate problem. But on further investigation, ...
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190 views

how to get creation date of a lvm snapshot?

Is there some way to get the date that an lvm snapshot was created? lvs --version LVM version: 2.02.66(2) (2010-05-20) Neither lvdisplay nor lvs provides this information. Looking through the ...
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240 views

Linux LVM replicated Volumes

I am migrating storage arrays, on two sites.The DR site has synchronous block replication from main site that will be cut during the migration, however once the volumes are migrated the replication ...
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1answer
204 views

NFS export configuration for multiple LVM logical volumes

I have setup a file server that contains two large file systems, each consisting of a single LVM logical volume (10TB and 16TB) within a single volume group. The physical volumes making up the LV are ...
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62 views

How to resize LVM thinpool?

I am trying to partition an ubuntu 14.04.3 server where I need to have thinly provisioned LVM volumes of 20G in size. Therefore I created a thinpool of 20G and inside a LVM volume of equal size. Now ...
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2answers
26 views

How to speed up restore process with gziped LVM?

I am experimenting with creating/restoring backups with the help of LVM. It works, but the restore process takes about 8 min. on an idel XEON with 32GB RAM and SSD. The system does not even seam to ...
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2answers
6k views

pvcreate: device /dev/sdXX not found (or ignored by filtering)

I'm unable to add a new volume (provisioned by a SAN storage) as a PhysicalVolume for the host's LVM volume. Here is the error message: #sudo pvcreate /dev/sdc1 -v Device /dev/sdc1 not found (or ...
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2answers
155 views

How check progress of lvconvert --replace

I'm replacing few disks configured with RAID5 at LVM. The command used to replace is lvconvert --replace /dev/oldpv vgname/lvname /dev/newpv It's start the process in background. The parameter -i ...
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3answers
667 views

No volume groups found - CentOS

I have migrated a CentOS 5.11 server from VmWare to Hyper-V and when trying to boot the server. I'm getting the following error messages: "No volume groups found" ""VolumeGroup00" not found" and ...
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1answer
605 views

How to automate GlusterFS backups with snapshots and dd?

I want to automate backups on a glusterfs 3.7.3 share with snapshots. Creating snapshots on a LVM manualy works, but how are they secured to a different server? I was able manage that process ...
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49 views

After installing a new disk, can't use old mount points on linux

So, I'm stumped on this one. I have functionally two volume groups. vgold and vgnew, and I migrated the lvms from the old one to the new one (via rsync of the files to an external drive first, not ...
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226 views

Freshly created LVs do not survive reboot - check of thinpool failed

In order to use gluster snapshots, I am trying to create LVs through LVM as thinly provisioned logical volumes are needed to make gluster snapshots work. Creation works, but the setup does not ...
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101 views

Problems with Booting “red hat”. disk volumes issue

I recently installed the Red Hat 6 OS on HP proliant server. This server has 8 1TB drives. I created two volumes RAID 5 each having four hard drives (and 2.7TB). On one of the volumes, I installed ...
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109 views

Striping LVM Across Multiple MD-RAID Arrays

I have a machine with three, fifteen drive mdraid RAID-6 arrays (md10, md20, md30.) These three arrays are then setup as physical volumes for LVM and combined into a single volume group. I then have ...
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24 views

Uneven load of 2 disks in 1 volume group

We have an application server with 2 Fusion-IO SSDs put into one volume group forming one single volume. Inside this volume there are 128 files of 40GB each accessed through memory map. When looking ...
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143 views

RedHat Cluster 6 node won't see shared volume group

I try to create a shared clvm volume group shared between 2 nodes of a Red Hat Cluster 6. Here is the procedure I followed: [root@node1 ~]# pvcreate /dev/mapper/mpathab [root@node1 ~]# vgcreate -c y ...
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2answers
430 views

Installing Windows on KVM with LVM disk

I am trying to install a windows server 2012 on a KVM. The host system is Ubuntu Server 14.04. I would like to use a logical volume, say /dev/VG/win, as main device for the guest system. However, the ...
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129 views

lvremove a snapshot: “-real” files left around, what are they, safe to remove?

I removed a snapshot volume with lvremove. It says it successfully removed it. But I noticed there is a "-real" file still in /dev/mapper. I believe these "-real" files are somehow associated with ...
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2answers
52 views

Need clarification on what lvm snapshots are and how they work [duplicate]

My understanding of LVM snapshots is that: when a block changes on the origin, the block is first copied (prior to the change) to the snapshot. The block is then changed on the origin as it would ...
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51 views

LVM partition says no space even though it's not

I'm trying to do backups on my Proxmox both to an NFS share. The NFS share is on an Ubuntu (14.04) server with a 2TB HDD separated into 2 x 1TB partitions with LVM. For some reason (looking with ...
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129 views

Growing docker's volume on an LVM

I followed the instructions here to set up docker on CentOS using the LVM. I fed it a 16G disk. It consumed 6.37GB. Now, one of my containers ran out of disk space. What do I have to do for docker to ...
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110 views

Can't merge an LVM snapshot into it's origin

I recently had a problem with an LVM volume because it's ran out of CoW space. I added more space to the volume and restarted it, now it shows CoW is only 66% full. It seems LVM created a snapshot ...
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18 views

delete a snapshot created before LVM extension

I believe that snapshots and disk extensions are not friends, having said that... Is it safe to delete a VMWare snapshot created before adding a new virtual hdd to my LVM partition? What I mean is: ...
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1answer
1k views

Create file system on multipath volume

I'm completely new to linux admin and file system. Recently we acquired an HP MSA P2000 san. I've setup the disk into a vdisk and created 3 volumes on it. On Centos 7, I've also setup the multipath ...
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74 views

The RAID 1 Time machine

Last night my server crashed, after reboot I have found it has a disk failure The configuration is 2 x 500GB sata on Centos 6 sda3/sdb3 is software RAID1 sda1/sdb1 = ext3 for / sda2/sdb2 = swap ...
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322 views

V2P - Using Clonezilla with VMware - but I have two virtual disks

Don't ask me why but I've been requested to V2P a VMware machine. I'm using Clonezilla and a couple tutorials online. But, my VM has two virtual disks (screenshot). Currently in the process, but if ...
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65 views

issue in increasing disk size in ubuntu guest vmware

Have followed link I was trying to increase the size of my disk allocated to ubuntu guest in vmware below are the things i have already done Increased max setting in vmware settings - Done ...
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3answers
3k views

Cloning LVM partitions

I need to clone a CentOS installation from a 1TB disk partitioned with LVM, to several identical machines. The disk is mostly empty since only the operating system and some software are installed and ...
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2answers
35 views

I've just increased the disk's size but the old size is still display, what could be the cause and how can I fix it?

I need to increase the size of the root logical volume on one of my CentOS 6 virtual servers. I've extended the virtual machine disk space from 16g to 30g. Then I've connected to the machine and ...
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0answers
94 views

Why is nfs server not seeing resized filesystem size?

On the NFS server, when I extend the the logical volume (using lvm2) and subsequently the ext4 fs on top of it (using resize2fs), I'm able to see the new size locally with df. But the NFS clients ...
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1answer
269 views

df is reporting wrong information in an LVM

I had a full disk usage on /var/log (100%) and deleted a few files to increase space. this is and ext4 partition mounted with default options. However, when I df -h I get: Filesystem ...
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1answer
135 views

Extending partition on centos 6

I have a VPS which appeared to lack some space somewhere. It should've been 150GB but was only 50GB. I've been trying to extend the partition but I can't seem to find out how even with the help of ...
2
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1answer
80 views

creating new partition for backup

I got a new server form hosting company. It has 2x2tb hard drives. I told the provider I would be using one drive for data/OS and the other for backup.Before doing offsite backup. I moved all my ...
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3answers
52 views

Logical Volume 100% Use but 50G Appears Free

I am resizing logical volumes on a CentOS server and I have come across an issue where the volumes say that they are 100%, though the "Size" and "Used" columns seem to indicate that there should be ...
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1answer
38 views

Listing all logical volumes in LVM2 that are snapshots

I have a logical volume that has snapshots where the lv name has the date in it. I'm trying to locate that snapshot using lvs and i'm getting close but can't figure out how to list logical volumes ...
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1answer
89 views

Steps to move an ubuntu 14.04 server install disk (damaged) with lvm to a new disk on the same system

Need some clarification on how to move the following : I have a Ubuntu 14.04 server install with LVM and its disk was failing. I have managed to clone the disk without any errors to a new disk of same ...
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1k views

Mounting Single San Drive on Multiple Hosts

I'm not sure exactly how to ask this, but here goes. We have a san. Within the san, we have the ability to connect a single volume to multiple systems as a raw disk. The Servers themselves would see ...
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1answer
117 views

Adding new physical volume in encrypted volume group (LUKS)

I have a CentOS 6.6 desktop and chose the encrypt option upon installation. This created a LUKS volume group. Everything works fine, but I want to add an additional drive to the volume group. From ...
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1answer
159 views

how to identify which physical drive(s) correspond to an entry in /etc/fstab [duplicate]

Using Centos. Situation: I have multiple drives off of two RAID controllers. I also have multiple entries in the fstab, such as /dev/sdb, /dev/sdc, etc. What I need to know is how I can identify ...
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890 views

Extending LVM Volume Groups with Physical Extents & pvresize

I have two somewhat related LVM questions regarding extending LVM managed volumes. Firstly, from (edit: old) documentation that I've read about LVM and the relationship between Volume Groups and ...