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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Does the LVM DM UUID contain any metadata?

For example within the name listed below is there any metadata within the name, eg based on server serial number or date created or such: ...
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102 views

Please help recovering lost volume group

After a reboot, the volume group on my server completely disappeared. [root@dal01 log]# vgdisplay No volume groups found [root@dal01 /]# lvdisplay No volume groups found [root@dal01 ~]# pvdisplay ...
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64 views

How can I specify to lvconvert which mirror leg to drop when specifying the physical volume is ambiguous?

I have managed to end up with an LV with the following mirror setup (output from lvs -a -o name,devices,lv_attr): rawphotos ...
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109 views

Restore LVM if VG is not consistent (XenServer 5.6.1)

i have a VG that uses the PVs /dev/md1 and /dev/md2. Now one hdd failed in /dev/md1: [root@xenserver1 ~]# cat /proc/mdstat Personalities : [raid1] md1 : active raid1 sda3[0] 382320128 blocks ...
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137 views

Convert single O/S disk to RAID 1 - Ubuntu 12.04 LTS

I have a server running Ubuntu 12.04 LTS with only a single drive. There are 2 more empty hot swap bays in the chassis. I want to add a little redundancy by adding a RAID 1 to the system. The ...
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281 views

Almost All Xenserver Logical Volumes Disappeared - Recovery?

We had a hard disc crash of one of two hard discs in a software raid with a LVM on top. The server is running Citrix xenserver. On the hard disk which is still intact, the volume group gets detected ...
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606 views

LVM DRBD Shared between nodes proxmox

Context : I have proxmox cluster with the volume group shared with drbd for the VM - KVM. I have a problem with drbd. Indeed, when a node disconnect, the associate link between the differents nodes ...
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130 views

Debian: preseed partitioning results in deadlock

I'm using this code in my preseed.cfg for debian testing (wheezy): #Partman partman-auto partman-auto/init_automatically_partition select 50some_device__________regular partman-auto ...
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304 views

How to clone LVM thin provisioning volume?

I googled many times but couldn't find an answer. What I want is cloning an LVM thin provisioning volume to another thin volume. For now I know dd can clone a thin volume as following: dd ...
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217 views

pvcreate not working: can't open exclusively

After having added 2 disks of 1Tb to a Dell PowerEdge, I went through their initialization with the goal to add them to an existing LVM VG. When the MegaCli background initialization went complete, I ...
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268 views

linux hardware raid 10 / lvm / virtual machine partition alignment and filesystem optimization

I've been reading everything I can find about partition alignment and filesystem optimization (ext4 and xfs) but still don't know enough to be confident in setting up my current configuration. My ...
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174 views

What is the default metadata size in temporary volume during a pvmove?

I ran into an interesting error when attempting to address a particular problem. We had an issue where we have to move the extents over to new physical volumes because the metadata size was too ...
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421 views

How do I create a RAID10 array using EBS on Amazon?

Basing this question on information I got in Why does df shows only half the size of a RAID10 array?, how should I create a RAID10 array using EBS volumes on Amazon, in a way that will not be ...
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reusing existing raids on preseeded instalation

I'm trying to automate reinstall process of existing ubuntu installation. partition layout : md0( raid1, /dev/sda1#/dev/sdb1 ) - swap (2G) md1( raid1, /dev/sda2#/dev/sdb2 ) - / (20G) md2( raid1, ...
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39 views

Migrate CentOS VM using LVM on IDE to run with VirtIO

I'm trying to migrate existing IDE-using, LVM-based CentOS 5.2 VMs to use virtio. The symptom is a kernel panic upon boot when the system can't find any volume groups. Does anyone know how to make ...
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20 views

reclaim space from xen server

i found xencenter stotage => general tah display 1096.6 GB used of 1107.7 GB total (708.5 GB allocated) seen some space have been eaten and not release. the SMLog show that [13816] 2014-03-28 ...
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82 views

Debian Preseed use whole device for LVM Physical Volume

I have the following recipe for a preseed install (truncated for readability): d-i partman-auto/expert_recipe string \ boot-root :: \ 1 1 1 free \ $iflabel{ gpt } \ $reusemethod{ } ...
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55 views

SSD+MDRAID+LVM+KVM results in lower performance than expected

We use kvm for virtualization, the disk images are stored as logical volumes. The logical volumes are stored on a bunch of software-RAID1 (mdadm) arrays composed of Intel DCS3500 SSDs (each array is a ...
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25 views

Change the logical volume

I am quite new this snapshot process. Let, I have three logical volumes as A, B, C. I worked on logical volume C. But accidentally when I restart the system, it goes to the snapshot A. How can I ...
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32 views

Attach Multiple disk LVM from old Xenserver to new Xenserver

hope you can help me with this one... We have a Xenserver 6 with 4 320 Gig disks as a one LVM Volume Group. Suddenly past friday one disk failed and we were unable to start the server. I have tried to ...
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82 views

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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22 views

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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129 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 ...
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144 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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78 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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142 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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193 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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162 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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76 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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68 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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97 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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164 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 ...
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221 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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249 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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327 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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543 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 ...
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78 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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24 views

Optimizing disk performance on KVM VM configuration

I have a KVM host server running Ubuntu 12.04 LTS, bare bones installation with only KVM installed. The server has an 8 Core Intel(R) Xeon(R) CPU E3-1230 V2 @ 3.30GHz CPU with 32GB of RAM and SATA ...
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36 views

Any disadvantage of running a virtual machine using files for its drives hosted on freenas/zfs?

I recently got tired of the really slow I/O reads and latency (10-30 MB/s read, not sure for latency but very slow) from a provider I rent a virtual machine from. He uses freenas, the virtual machine ...
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how to fix a PV in LVM without uuid in a new linux?

I have a server which its first hdd was broken , the server has 2 HDD , the first hdd crashed . datacenter replaced it for me with a new hdd. the second hdd used to have 2 PV on 2 partitions , and ...
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28 views

Ubuntu 12.04 multipath boot device with LVM

I'm bootstrapping Ubuntu nodes using cobbler, with a predefined preseed. Due to a bug in Ubuntu: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/959749 it doesn't work too well to install on a ...
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33 views

lvextend onto a ramdisk or tmpfs

I want to be able to run system image backups of my root partition without downtime. I've read that I can use LVM snapshots and dd to create such images, but my current lvgroup has no unallocated ...
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119 views

VDI size limited to 2TB in Citrix XenServer 6.2

I would like to know if it's possible to create a VDI greater than 2TB with Citrix XenServer using LVM over iSCSI. This limitation is not viable in a virtualized repository server. There's any ...
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37 views

LVM - after server reboot data changes of last 6 month lost

I have a server setup with a Proxmox VE on LVM groups. Today I could not kill some processes, so I decided to reboot the server. This did not work eighter so I had to press the reset button. After the ...
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Ubuntu server - Installation to second harddisk - LVM

I have VPS with crashed filesystem ( missing /etc direcotry after fsck ) and 2 virtual block devices: /dev/vda and /dev/vdb Partitions on /dev/vda: 1# /boot 5# LVM root swap Partitions on ...
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299 views

KVM LVM-based guest… kernel: Buffer I/O error on device. Failing drive?

Currently setting up a small KVM host to run a few VMs for a small business. The server has 2 drives in software md RAID 1, then I have it set as a PV in an LVM setup. Guests and hosts are all CentOS ...
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189 views

Installing Debian 7.1 on FakeRAID/Intel Z77 results in boot with no grub menu

I'm trying to install Debian 7.1 from DVD onto 2x500GB drives which are set up in a FakeRAID mirror using the on-board FakeRAID provided by the Z77 chipset. I have followed the guide here ...
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24 views

Decrease block size of ext4 on lvm

is it possible to ecrease block size from 4096 to 2048 of an ext4 on lvm partition without loosing data? Thanks for Help Heiko
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74 views

Speed up lvm2 mirroring process

(As a LVM2 noob) I have converted a linear volume to a mirror, now it is slowly (iostat says around 7/sec) mirroring everything over. Can I speed up the mirroring process by adapting some tunable? ...
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179 views

Raid superblock missing on single partition. Recovery needed

Ok so I have a 2 TB raid 1 setup that has three partitions: sdc1: linux sdc2: swap sdc3: LVM for data However the LVM will no longer mount. So I thought that I would take the spare drive, mount it ...