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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best way to create lvm snapshot of / partition [closed]

I need to know the best way to implement the snapshot of root partition "/" on a kvm guest. What I have is as follows 1- /dev/vda ..... 10G free -- /dev/vda1 boot partition (ext - 83) -- ...
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LVM meta data missing from a device

Here is the situation. I have a MD device, /dev/md0, which is fully functional, but seems to have no LVM meta data. As far as everything I know how to do is concerned, it isn't part of a volume ...
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86 views

How can I make the root logical volume smaller without problems and downtime?

[root@tst-01 puppet]# lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert lvhome vg00 -wi-ao 2.00g lvroot vg00 -wi-ao 38.75g lvswap vg00 -wi-ao 4.00g lvtmp vg00 -wi-ao ...
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55 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 ...
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118 views

Add new partition to Centos hard drive

My hard drive currently has (I believe) 2 partition; boot (sda1) and everything else (sda2?). Some of the hard drive is also being used as swap memory, but I don't really understand how that effects ...
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844 views

Very high memory usage, but not claimed by any process?

While stress-testing LVM on one of our Debian servers, I came across this issue where memory would fill up a lot to the point where it would run the server out of memory, but no process would claim ...
3
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1answer
126 views

Backup of write heavy Solr / MySQL server

I am attempting to set up an automatic backup for a server running Ubuntu. This server is used to host a couple applications which are rather write heavy and subject to a good amount of traffic. To be ...
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1k views

What is the difference between the Linux and Linux LVM partition type?

Fdisk shows multiple partition types. What is the difference between choosing 83) Linux and 8e) Linux LVM? Choosing 83) Linux also works fine for using LVM, even creating a physical volume on ...
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312 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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434 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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3k views

How to change Volumegroup PE size

I am trying to increase the PE size of one of my Volume groups. I mistakenly set it as 4M to start when it should have been 32M . When I try to change the size I get vgchange -s 32M the_vol New ...
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173 views

Extending ext4 partition on debian7.0 on vsphere

I have allocated thin provisioning of 15GB when i found 8GB as insufficient. Now debian guest is not able to recognize the change of size. root@debian7-x64:~# lvdisplay --- Logical volume --- LV ...
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1answer
2k views

XFS slow performance on LVM'ed RAID, faster when RAW or non-LVM

longtime user of this website, first time poster. I have a weird issue with a server I am setting up. It's for a filesharing-type website, so fast IO and plenty of capacity are the requirements. OS ...
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238 views

lvm-managed gpt partition: partition length exceeds the loop-partition-table-imposed maximum

CentOS 6.4 /dev/sdb is a hardware raid. I'm getting this error reported from 'parted -l': <snip> Model: JetStor JetStor -VOL#000 (scsi) Disk /dev/sdb: 39.0TB Sector size (logical/physical): ...
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204 views

Reallocate Storage in Red Hat 6

Is it possible to (safely) reallocate storage space in /home to the root filesystem? $ df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_yavin-lv_root 50G 35G ...
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454 views

is there any advantage mounting an LV by UUID instead of by path?

I know I can specify mounts in fstab by either putting their path (like /dev/sda1 or /dev/mapper/myvg-logicalVolume1) or by fs label (LABEL=root) or by UUID (UUID=1234-5678-...). I see a clear ...
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188 views

How to restore a logical Volume Group with missing devices?

I have a volumegroup which consists of three harddisks and several LVs (var,tmp,root,swap). One of the harddisks crashed recently, but i urgently need some data from LV var. So, after rebooting the ...
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290 views

ext4: Online resize not detected

On a RedHat 6 server, we ran into an issue with online resizing of an ext4 filesystem. With only /dev/sda we had 13GB available in the volume group, but needed 20GB more on one logical volume which ...
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81 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 ...
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3answers
114 views

Preventing server (Git/ssh) access during LVM snapshot

If a Git operation is ongoing at the time of an LVM snapshot, the repository can (and will) be snapshoted in a corrupt state. (This has been discussed a lot ...
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323 views

Is it possible to resize a mounted LVM partition on the fly?

Situation: We have a server that has a 40GB SAN (Fiber Channel) mounted as /opt/application. If the LUN is expanded to 60GB, what needs to be done to expand /opt/application on the RHEL-server to ...
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127 views

Linux automatically creating LVM partitions on RAID members?

I've had a software RAID1 array in production for over a year which has LVM partitions on top of /dev/md0. I rebooted over the weekend to apply some kernel patches and now the array won't come up. ...
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362 views

RAID1 LVM, XEN and flashcache

I am regarding to question: Improving IO with FlashCache I have setup a RAID1 (/dev/md0) LVM (*/dev/vg_xen*) and executed following command: flashcache_create -p thru flashcache0 /dev/sdc /dev/md0 ...
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67 views

Convert a LVM into a RAID 5

I have 3 disk (600GB) only one in use. is possible convert into a RAID5 without need a external disk my system is: Ubuntu 12.04.1 LTS 3 x SAS 600GB Hitachi (only 1 in use in a VG)
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465 views

find file by block number on ext3 fs on lvm

smartd has detected a bad block on my hard drive and I'd like to know what file does that block belong to. I have ext3 filesystem on a logical volume. Google gave me a lot of tutorials (like this one: ...
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1k views

extend unallocated disk to an existing lvm

im using vmware on my ubuntu server, initial setup was 10GB disk utilization, increased it to 15GB using lvextend and added another 5GB for a total of 20GB. below displays my fdisk -l Disk /dev/sda: ...
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LVM thin provisioning

I am looking to create a group of thin provisioned LVs using LVM. Is it possible to create a volume group in which every logical volume created is by default thin provisioned, or perhaps there is ...
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190 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 ...
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2answers
613 views

Hybrid RAID with LVM + mdadm

So I've been looking Synology and their idea of Hybrid RAID to make mixed drive RAID arrays both fault tolerant and efficient. So, I'm testing an idea (performance isn't a concern here), with a mixed ...
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533 views

Grub can't find Xen multiboot file

I am running Debian Wheezy on a software RAID 0 with LVM. I'm trying to get Xen to work but grub refuses to boot in it. I installed Xen by following the instructions here: http://wiki.debian.org/Xen ...
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545 views

Are ext4 RAID5 tuning options useful under LVM?

I'm setting up a system with a system with a mdadm RAID5 which is the sole PV for a VG which hosts 4 LVs. When I make the filesystem, would the mkfs.ext4 -E option be useful? Or is its effect not ...
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352 views

“LV Status NOT available” after converting root from lvm2 to lvm2+raid1 (lvconvert --type raid1)

I just converted by lvm2 root filesystem from linear lvm2 (single HDD:sda) to lvm2 raid1 (using lvconvert -m1 --type raid1 /dev/ubuntu/root /dev/sdb5 command). But after this conversion I can't boot ...
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211 views

ext3 converted to ext4 still being mounted as ext3

I have a somewhat bizzare problem at the moment with my Debian-system (mainly testing). I used to have a root-partition on lvm that was formatted as ext3. I now booted a live-system and converted ...
2
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124 views

Recover data after lvreduce on “/”

I accidentally ran lvreduce on / instead of "/home" on a RHEL 5.9 system that unfortunately had a lot of code that was not backed up, and the system will not boot now obviously. What is the best way ...
0
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52 views

Easiest way to change directory into its own logical volume in LVM2

I have a dir called /mydir on logical volume /dev/vg1/lv_root ( / ) var is on its own logical volume, so is opt and /usr.. If I have free space in the volume group, what is the easiest way to change ...
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110 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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376 views

Using LVM to extend 2TB diskd on a linux VM?

Currently have mounted on one of my web servers a linux box on VMware with two external drives in. These are both 2TB drives which is the limit to what you can add into VMware. I want to use lvm to ...
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74 views

Storage virtual machine. LVM or loop devices? [closed]

Actual situation: I'm the administrator of a virtual machine. The virtual machine is a Debian. This machine will be mainly a storage machine with different services (svn, ftp... ), and a webserver. ...
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1k 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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5k views

Used vgextend/lvextend to add addtional 8GB space but it is not reflected in df output

I have created an instance of ubuntu VM in VirtualBox. At the beginning I have only allocated 7GB for the storage and the VM has now run out of space. First I added another 8GB (/dev/sdb) to the VM ...
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2answers
86 views

mount a partition on an lvm partition

I have a xen dom0 server (named virtserver), which contains a guest machine, let's call it "virtguest". The virtguest used to be a physical machine earlier, and the whole old disk (with several ...
0
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1answer
95 views

KVM copy contents of image into raw smaller LVM2 partition

I have a KVM guest, running on a KVM host...both Gentoo Linux. The guest is called webserver.img. It is 21 gigs large, but I am only using 5 gigs inside the image. I want to make a logical volume ...
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212 views

Snapshot a KVM guest with non-file storage

I am preparing at least one Windows 7 guest on a KVM Linux (ubuntu) host. I have made an LVM-based storage pool which I would like to use. My main concern is snapshots. The disk-image will be ...
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400 views

LVM mirror with data and logs mirrored on same 2 devices

I'm trying to set LVM mirroring with only 2 devices. It works perfecly when I add third device for mirrorlog, or use corelog. But with only 2 devices and --alloc anywhere LVM nearly always creates ...
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108 views

How does data storage on Amazon EC2 work especially for databases?

I've been playing around with Amazon's Web Services for over a year now, however I don't quite understand how it works. When I for example select an AMI of my choice from the EC2 console and I ...
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260 views

VMWare ESXi: to extend a partition or create a new drive?

Is it better to extend an existing partition or to create a new drive in a VMWare ESXi virtual machine? I'll be using LVM to put the drive in an existing volume group on my VM and to extend a SAN ...
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187 views

lvconvert --merge how to undo?

I have created a script for users who work on KVM virtual machines to be able to perform lvm snapshots on the logical volumes where their VMs are installed. Snapshot restores are performed via ...
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132 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 ...
2
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2answers
6k views

LVM: “Couldn't find device with uuid” yet blkid finds the UUID

I have a SLES 11.2 PPC (3.0.58-0.6.6-ppc64) system that lost track of its volume group (containing LVs with data that is not critical but would be rather nice to get back). The disks are connected ...
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78 views

LVM Snapshot confusion

I think I understand some of the lvm snapshot concept, but am confused about one last thing. After you take the snapshot, if you don't mount it, will it be active? What I really want to know is will ...