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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Need help recovering RAID 6 array

My CentOS 6.5 server had its primary drive fail the other day. Our hosting company replaced the primary drive and reinstalled the OS. The system is up and running, but the 15TB of RAID6 storage isn't ...
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408 views

Why won't my Ubuntu 12.04 Preseed file work with LVM

Here is my preseed file: d-i partman-auto/disk string /dev/sda d-i partman-auto/method string lvm d-i partman-lvm/device_remove_lvm boolean true d-i partman-lvm/device_remove_lvm_span boolean true d-...
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287 views

Volume unreadable in KVM guest after host volume resize

I have a KVM guest requiring more space on one of it's partitions. This partition is actually an LVM volume on the host. So I first unmounted the partition in the guest, switched to the host and ...
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231 views

udev rule for disconnection and hibernate/suspend

I have an external hard drive which contains different GPT partitions. One of them is a LVM partition. This partition is contained in a LVM volume group (called "volga"), which in turns splits into ...
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365 views

Ubuntu 10.04 Server stuck at grub prompt

I have a virtualized server running 10.04 LTS that is no longer booting. We had a number of issues with our SAN that abruptly disconnected the storage from the virtual machine infrastructure and ...
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312 views

LVM failure recovery

We have an server PC with "intel matrix storage manager" raid (or maybe 'fake' raid) controller. Firstly there were one RAID-1 with two equal seagate disks of 1TB size. We've installed ubuntu server ...
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330 views

Backing up VMs to a tape drive

I've got myself one of these fancy tape drives, HP LTO2 with 200/400 GB cartridges. The st driver reports it like this: scsi 1:0:0:0: Sequential-Access HP Ultrium 2-SCSI T65D I can ...
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87 views

Single drive LVM to RAID6 LVM

I cloned my entire LVM volume group from a single drive to a RAID5 array with 3 disks. The VG is formed by these logical volumes: root swap home ... and other volumes of some XEN virtual machines. ...
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86 views

Setup cloadmin on Centos installed in LVM

I installed CentOS 6 with default LVM partition pattern. according to this pattern Can I use Cloudmin and store KVM Disks in LVM as Logical Volume?
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104 views

command line LVM issue on CentOS 5

I am able to create from using lvm GUI to do as follows: /dev/var-v0l/var /var ext3 defaults 1 2 /dev/varopt-vol/var-opt /var/opt ext3 defaults 1 2 ...
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707 views

I/O error on non-existent device?

Getting the following in /var/log/messages: Sep 17 10:38:53 server1 kernel: end_request: I/O error, dev sde, sector 0 Sep 17 10:38:53 server1 kernel: end_request: I/O error, dev sde, sector 63 Sep 17 ...
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221 views

Linux software Raid LVM restore volume group

first of all: excuse my bad english :) We use a Archlinux server with 3 HDD in software raid 1 mode. There should be two lvm extended partition from which i think they should be work in volume groups....
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263 views

lvm/xfs does not utilize full raid device

My older 2 CPU server (32-bit LV Xeon, centos 5) drives a raid6 array. Since I grew it from 7x2T to 8x2T (I had to CD boot a "more modern" fedora to even do the 82-hour growing, but that's another ...
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325 views

After upgrade to SLES11 SP1 - LVM on top of software RAID5 not working anymore

On a system where I have been running OpenSuSE11.1 for some time I performed a fresh installation of SLES11 SP1. The system used a software RAID5 system on top of which an LVM was setup with a single ...
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408 views

Imaging LVM-based Linux system to new computer: UUIDs change?

We are attempting to use Acronis TrueImage to copy the hard drive from one standalone Red Hat Enterprise Linux 5.5-based computer across to two others as part of a production operation. We are using a ...
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636 views

squeeze with lvm on top of raid 0 fails to boot using grub2

GRUB Loading Welcome to GRUB! error: no such device: <GUID>. Entering rescue mode... grub rescue> ls (hd0), (hd0,msdos2) (hd0,msdos1) grub rescue> set prefix=(hd0,msdos1)/grub root=hd0,...
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85 views

Configuring multiple XFS filesystems with external logs on LVM

I'm configuring an NFS server with multiple filesystems for use by different groups of users. Other similar systems we have installed recently have used XFS filesystems on logical volumes, on top of ...
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15 views

df use% shows wrong output even space is available

suddenly facing a space issue on production server , df -h shows there is a free space but the percentage calculation is wrong. Filesystem Size Used Avail Use% Mounted on ...
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11 views

Cannot reduce logical volume due to busy device

[root@lab7-mongo-7 /]# lvdisplay /dev/vg_lab7mongo7/lv_home --- Logical volume --- LV Name /dev/vg_lab7mongo7/lv_home VG Name vg_lab7mongo7 LV UUID s4Cwkh-...
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45 views

LVM Raid1 mirror leg lost

Odd one. I have 3 x 3TB disks in my server. /dev/sdc[1] is a raw 3 TB disk /dev/sda2 is /boot /dev/sda3 is 3TB /dev/sdb1 is 3TB sda3 and sdb1 were a raid1 mirror The server was up for some time, ...
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37 views

lvs command cannot find LVM partitions, what tool to use to interact with these partitions?

When doing a fdisk -l there are two "Linux LVM" partition, but using lvs returns nothing and lvmdiskscan returns "0 LVM physical volumes". What tool should I use to interact with these partition ? (...
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28 views

Am I wasting half my disk space by not mounting a volume?

I inherited a Debian server from the previous sysadmin who left, without much documentation. I'm not a sysadmin, but I guess for now I'll have to be, and I'm trying to understand what disks and ...
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13 views

centos 7 /etc/lvm/archive flooded

not sure how to track down this but /etc/lvm/archive is seeing multiple entries created per minute. there is no cron job set up to do such archiving. also other similar servers do not have this issue (...
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13 views

DD + LVM Snapshot + Space shortage

Here is the scenario : I have a production system that can't be shutdown for very long, it has the following root filesystem LVM: [root@an2 ~]# df -h Filesystem Size Used ...
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35 views

LVM difference between LV size and Cow-table size?

I created a snapshot: lvcreate -n Snapshot -L 512M -pr -s /dev/fedora_2016/home now with lvdisplay it says that LV size is 2GB and Cow-table size is 512MB. 1.What is the difference between LV size ...
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54 views

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 ...
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71 views

How to recover XenServer vm's from a mdadm raid 1 HDD

I have an older server, namely, Fujitsu Siemens Primergy TX 150 S6 on witch i have installed XenServer 6.5.0-90233c. On it i have multiple virtual machines of different sizes of witch i need to ...
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25 views

lvcreate reports disk full, vgdisplay says space still exists

I'm attempting to create some new lvm partitions for a Xen VM. The drives are already set up - running sudo vgdisplay give me the following: --- Volume group --- VG Name n3850a-vg0 ...
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82 views

Hardware raid, LVM and KVM cache policy

I have a question about right cache policy for KVM using LVM and hardware raid-controller. So from the bottom: 1. We have LSI RAID controller 9260, 512Mb cache and BBU. Later we also will have ...
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25 views

LVM - VG not recognised - how to fix?

I have a (CentOS) server running a KVM and a number of (Ubuntu) VM's. Each VM servers disk is mapped to its own LV on the CentOS server. I discovered today that one of the VM's is failing to reboot ...
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33 views

LVM File Systems created with multipathed ISCSI storage LUNs are automatically going to Read-Only mode

I am using my RHEL 5 server with SAN LUNs to take the backup of my domain mails of all the users. For the redundancy, I configured multipathing for those LUNs. For scalability, I used those ...
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50 views

Encrypted LVM stops when mounting swap

I have configured a disk with LUKS this way (Ubuntu server 15.10): Boot partition Rest partition (LVM group) LVM data -> Encrypted (pass) -> ext4 /data LVM root -> Encrypted (pass) -> ext4 / LVM ...
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20 views

RHEL 5 LVM: “dmsetup info” showing “Tables Present” as None

We have running a huge Live Setup on RHEL 5 and Storage LUNs configured on LVMs. Until recently the server is running fine but we have triggered a reboot over the machine for some maintenance purpose ...
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49 views

setting nr_requests for build server - LVM partition

I have a build server with a free ram of about 120 GB after boot. I also have 3 disks in total, which I am using as one LVM with 3 stripes. I would like to increase nr_requests for the block device. ...
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42 views

Options to display only snapshot volumes for lvs

Please consider the following configuration: Hard Disk: /dev/sdb (Size 10 GB) VG: vg_root on /dev/sdb THIN_POOL thin_pool occupying the whole physical extent lvcreate -y --extents 100%free --thin ...
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16 views

The tool thin_delta segfaulting

I am trying to run thin_delta and it is segfaulting. OS : CentOS 7. Cmd: /usr/sbin/pdata_tools thin_delta --verbose --thin1 1 --thin2 2 /dev/mapper/vg_root_thin_pool_tmeta I have a thin volume and ...
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31 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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60 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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77 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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263 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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74 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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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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150 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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88 views

Data recovery seems impossible after kernel upgrade. MDADM (Raid1) LVM2

I opened a question about rebuilding a bad partition My Problem that din't take me anywhere. Bad news is the company trying to rescue the data says it's finding huge inconsistencies they can see some ...
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94 views

Backup MySQL with LVM, questions about the MySQL Session

I want backup my mysql database with lvm. I will do the backup with cronjob. Here the pseudocode Open mysql session Run SQL FLUSH TABLES WITH READ LOCK Do backup lvcreate -l100%FREE -s -n mysql-...
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276 views

mkfs.gfs2 failing silently on centos7 cluster?

I'm building a test cluster using centos7 and pacemaker, with shared storage on GFS2 over clustered LVM. I've set up a 2-node cluster, dlm and clvmd, both nodes can see the clustered logical volumes. ...
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181 views

lvm disk corrupt after force power down

I have virtual machine running on kvm host. But after force shutdown (unplugged power supply of physical server), virtual disk corrupted, cannot boot to OS (OS: CentOS 32bit, include 2 partition, ...
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37 views

Failed RAID 1 drive in a logical volume - lost cause?

I have a non-critical CentOS 6.5 server with a rather quirky disk setup: The main logical volume (mounted as /) comprises two RAID 1 disk pairs, so it's made up from md1 (2TB) and md2 (1.5TB). ...
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586 views

EC2 instance with partitions for /boot as ext4 and root / as lvm possible?

I've been playing about with this for a few days now. I haven't managed to find an example of someone running an EC2 instance with the root volume partitioned to have /boot on ext4 (or 3 or 2) and ...
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584 views

swapoff running forever on LVM volume

I'm currently trying to resize my swapspace on a Proxmox VE server with LVM volumes, as I'm running out of space for LVM snapshots and the swapspace is fairly oversized: root@rb-srv-gus:~# free -m ...