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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586 views

Grub2 reports physical volume pv0 not found on server non bootable anymore

I first installed my ubuntu server (11.10 amd64) using lvm but not fully mastering the concept of it. I think that's partly what made the mess of partitions on my two disks (seems to me). I installed ...
4
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1answer
394 views

rsnapshot LVM fails to remove snapshot volume

I am using rsnapshot on a Debian Wheezy server. This was recently upgraded from squeeze. Since the upgrade, I am getting the following error from the hourly cron job: remote rm -rf ...
4
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1answer
131 views

Logical Volume Recovery

I have a machine with 180 or so logical volumes as well as an OS partition that were wiped out with a format when reinstalling centOS6. I made a terrible mistake, not being familiar with the interface ...
4
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1answer
486 views

EC2 disk goes to 100% util, but fine after reboot

We've been running some production services on Amazon EC2 for a while, using mainly t1.large and t1.xlarge instances (non-EBS). Every so often one of the attached (ephemeral disks) will get into a ...
2
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1answer
29 views

Expanding RAID6 with LVM

My question is a bit broader than the question title, but here is my situation: I have Synology Hybrid Raid (SHR) built on 2 x 2TB drives. I want to migrate to a software-RAID on a homegrown linux ...
2
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1answer
66 views

Is it possible to create metadata only snapshots with LVM?

Using dm thin I understand it is now possible to store the metadata separately from the snapshot itself. Does anyone know if it would be possible to create metadata only snapshots which do not incur ...
2
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1answer
377 views

clvmd problems during the RHEV cluster deployment

We are deploying Red Hat Enterprise Virtualization cluster and we faced a problem attempting to start clvmd service after the lvm partition creating. The following has been completed successfully: ...
2
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1answer
452 views

KVM guest won't boot from hard disk image, but will from CD-ROM image

I'm using KVM to host a Debian unstable guest on a Debian unstable host. Emphasis on 'unstable' :-) Until recently (and until a recent round of Debian package updates on both host and guest) this was ...
2
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1answer
53 views

Why the I/O rate difference between an LV and PV?

I have been doing some benchmarks reading with dd from both the LVM device and the PV device and I got some unexpected results: $ sync ; echo 3 > /proc/sys/vm/drop_caches; dd bs=1M count=1024 ...
2
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1answer
142 views

LVM+MongoDB. Dropping in speed of backup creation

Till recent time we have been making mongo backups archiving LVM snapshot on hidden SECONDARY server with RAID10 on SAS disks. Currently operation on making snapshot from volume with 500 Gb of data ...
2
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1answer
436 views

I can't mount a LVM snapshot on a XEN host

I'd like to backup my XEN VMs by copying-rsyncing a LVM snapshot. I'm trying to mount a snapshot that contains a XEN guest's virtual disk (ext4). Below are all the steps I follow. I can't mount the ...
2
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1answer
88 views

LVM2 volume group lost

I updated one of my servers, but - although I took care not to modify - the volume groups on /dev/sdb1 were lost, although the physical volumes seem to be still there: [root@server ~]# pvscan PV ...
2
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1answer
918 views

why does my lvm2 volume group only work with multipath device mapper and not powerpath

my server is Oracle Enterprise Linux 5.4 (RHEL5) on an hp blade (x64) with qlogic HBAs connected to an EMC clariion SAN. we are migrating from multipath to powerpath because emc and the company ...
2
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1answer
370 views

can't recover LVM volume: Please specify a *single* volume group to restore

I'm trying to recover a deleted LVM volume but can't see to get the syntax right. Running the following command gives me a list of backed up LVM volumes: root@usaxen02:[~]$ vgcfgrestore -l ...
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1answer
146 views

In a distributed filesystem like MooseFS or XtreemFS, should individual nodes expose “raw-er” storage, or LVM'd storage?

When preparing an infrastructure to utilize a distributed storage system like MooseFS or XtreemFS, how should individual nodes present storage to the rest of the environment? Is it better for ...
1
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1answer
35 views

Encrypted partition on Debian requiring multiple keys to unlock

The title pretty much sums it up, but I want to create a second data partition on a web-facing server which is encrypted and requires two people to provide passphrases before it can be unlocked. Is ...
1
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1answer
75 views

Breaking off /tmp using LVM

I've recently been put in charge of a RHEL6 server running our NMS. I don't know much about Linux filesystem administration. What I'm needing to do is create a partition for /tmp, instead of having it ...
1
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1answer
51 views

identical drivers different pv size

i've got strange situation with identical drives: pvdisplay --- Physical volume --- PV Name /dev/sda5 VG Name group1 PV Size 465.52 GiB / not ...
1
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1answer
106 views

Does Ubuntu 12.04 LTS support booting from RAID 6?

I'm setting up a new Ubuntu server using 12.04.2 LTS. I have five drives that I am setting up in a RAID 6 with LVM. Can I use this for bootup? Or should I make a separate RAID 1 partition for bootup ...
1
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1answer
189 views

Exporting Volume Group From One Server To Another Difficulties

I'm attempting to migrate a volume group from one Ubuntu 12.10 server to a new Ubuntu 12.10 Server(upgrades). My existing VG is spread across 3 physical drives, and within the VG is 2 logical volumes. ...
1
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1answer
417 views

volume group disappeared after xfs_check run

EDIT** I have a volume group consisting of 5 RAID1 devices grouped together into a lvm and formatted with xfs. The 5th RAID device lost its RAID config (cat /proc/mdstat does not show anything). The ...
1
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1answer
253 views

high load and OOM-killer on domUs while pvmove

Situation xen 4.0.1 dom0 (debian squeeze) domUs all with LVs as disks: disk = [ 'phy:/dev/vg-00/domu-swap,xvda1,w', 'phy:/dev/vg-00/domu-disk,xvda2,w' ]) one VG (vg-00) with 2 PVs Goal Move all ...
1
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1answer
589 views

Assembling Software RAID in Live CD for data recovery

I need help recovering some data that's on my RAID which is on a LVM on my server running Ubuntu. What happened was I deleted the logical volume that controlled my swap space which was on a partition ...
0
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1answer
30 views

sed fix for BusyBox - boot fail unable to mount LVM

BusyBox why u no vi?! Summary: Ubuntu 14.04 Server after upgrade first boot, only boots to BusyBox v1.21.1 initramfs with "gave up waiting for root device" due to missing /dev/mapper/xxx-root as ...
0
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1answer
22 views

LVM - Moving data between Logical Volumes within the same Physical Volume

I will have two logical volumes that exist within one physical volume (RedHat Linux LVM). I will also be moving a lot of data between these LVs. My question is: Does the data get moved on the actual ...
0
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1answer
24 views

Very high load during pvmove in domU

I had a pretty bad time this evening. I had to move LVM2 LVs from one PV to another (source PV backed by NFS stored vdisk, target PV backed by an iscsi LUN). Moving small LVs of ths VG (few gigabits) ...
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48 views

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 ...
0
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57 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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47 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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174 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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47 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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49 views

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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616 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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321 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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28 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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87 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? ...
0
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221 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 ...
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72 views

How to install a Debian on the remote Server with running Debian alreadz?

There are many tutorials (e.g. the main I think: D.3. Installing Debian GNU/Linux from a Unix/Linux System), how to install a new Debian from one another. But they all sounds for me like you need a ...
0
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129 views

Why does Xen fail to create domUs/start the virtual network interface?

I have received two errors while trying to create a new domU on Xen. First, I received this error: Unable to complete install: 'POST operation failed: xend_post: error from xen daemon: (xend.err ...
0
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82 views

Trouble resizing LVM volume after expanding Areca 1280 RAID 6

My problem is very similar to Trouble resizing LVM volume after expanding Areca 1220 RAID 5 array; however, my 2 LVs are created on a unpartitioned raid volume: # pvdisplay --- Physical volume --- ...
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69 views

Create a Rawdisk from LV with partitions

For emergency in my old machine (CentOS with Xen server) i made clone my LVs with dd example: dd if=/dev/vg/lv0 of=/backups/vg_lv0.dd now in my new machine i've created a LV with the same size ...
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581 views

XEN Domain crash - kernel panic

I have a server with CentOS 5.8.Final, running the 2.6.18-308.4.1.el5xen kernel. I installed the Virtualizorpanel 2 months ago and my VPS are OK, but yesterday one of my VPS crashed. I changed theRAM ...
0
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544 views

Failed to activate logical volume

When running the following LVM command: lvcreate -n new_20_SdHv -L 96M new_20_SdDg I get this error message: error:Not activating new_20_SdDg/new_20_SdHv since it does not pass activation filter ...
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939 views

Can't mount logical volume, RAID/MD/LVM problems

I have a file server with 48 2TB HDDs split across 2x 3ware 9650SE-24M8 RAID cards. Both cards have 24 drives in RAID 1+0. MD softraid is setup in raid 0 with the two RAID 1+0s making RAID 100. LVM2 ...
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128 views

CentOS Volume Group remount after reboot

Using centos 6.2x86_64 /dev/sda is primary disk /dev/sdb is secondary disk. The volume group size of /dev/sda was not enough so i increased the size of volume group using vgextend command. It was ...
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475 views

Ubuntu 10.04 Server w/ root on LVM2, Cannot boot after kernel update

I am running an Ubuntu 10.04 Server with root on a md raid 5 / LVM2 volume. After a kernel update, boot hangs at initramfs saying it gave up waiting for root, "ALERT! /dev/disk/by-uuid/##..## does ...
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118 views

Recover data from failed volume group disk

I have a tale of woe to tell. I had (notice the past tense) a LVM VolumeGroup comprised of two physical volumes that failed due to the accidental deletion of one of those volumes. I am now trying to ...
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109 views

Detect corrupted LV/partition encryption type and fix and mount

Due to several recent power outages and a failed UPS, an encrypted logical volume is no longer accessible. It has been a while but I'm sure the encryption was done by using Ubuntu's installer, so it ...
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199 views

Redhat ext3 and/or powerpath issue

We are running Redhat EL 5 update 3 with Powerpath 5.3sp1. We did a FLARE upgrade on clariion and during SP upgrade, one of the emcpower devices which is mounted as ext3(using LVM) mounted as ...
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220 views

Please explain how to implement this: Portable DiskSafes With LVM Snapshots

I read a description of a very intriguing backup strategy that seems to fit my requirements. I need help to: implement it manually one time automate it to run periodically Here's the original ...