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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LVM volume falsely reporting itself as full

I am standing up a new CentOS 6 system to do some data processing. As I load the data into a brand new 100gb LVM volume, I reach about 35% full, and it starts to report that there is no space left on ...
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170 views

Cannot see available disk space in LVM

I have iSCSI disks connected to my server. i want to resize their capacity. It has LVM on the disk. when i resize the disk in equallogic SAN, i gave it 700GB. and when it check its disk space by fdisk ...
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2k views

LVM drive is not mounted after boot

I have created an LVM with three physical disks named "orcafiler1". Problem is, every time after boot, the LVM drive is not mounted and I have to manually run vgchange -ay orcafiler1 The fstab ...
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106 views

Is it possible extend filesystem on a non-LVM?

I have an Amazon Line AMI with two drives, one for root and one for data, 8G / 1024G /data the data partition almost full 93% /data, and I want to extend the data partition without wiping the ...
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How to convert lvm to ext3/4? [closed]

I have an old box(CentOS 5) that was formatted as lvm but now I want to convert it to ext3/4 file system without losing data. I have some empty disks that can be used, so is there an easy way to do ...
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3k views

Multipath device unpresented to host. How to delete it from LVM and the system?

OS: Red Hat Enterprise Linux AS release 4 Storage people had unpresented a couple of disks previously exported to the system (things that... sometimes happens). Well, there is no problem with this ...
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255 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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Device /dev/sdb1 not found (or ignored by filtering)

I am trying to add a physical volume for use to add volume groups and thus LV inside them. Sadly I am getting the following error. [root@server ~]# pvcreate /dev/sdb1 Device /dev/sdb1 not found (or ...
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Is it possible to on-line shrink a EXT4 volume with LVM?

Today I tried this on my machine with OpenSUSE 12.3 (kernel 3.7): # resize2fs /dev/mapper/system-srv 2G resize2fs 1.42.6 (21-Sep-2012) Filesystem at /dev/mapper/system-srv is mounted on /srv; on-line ...
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22 views

Taking storage from swap and adding to LVM

My current output of df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 20G 2.1G 17G 11% / tmpfs 64G 0 64G 0% /dev/shm /dev/sda1 ...
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158 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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83 views

LVM system space is not consistent

I have found some problem in my server, here it is: df -H | columt -t Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_test-lv_home 212G 177G 25G 88% ...
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1answer
181 views

Re-mount EBS vol on EC2 instance

I am new to sysadmin. I am trying to launch a EBS-backed EC2 instance. I did the following based on mongodb docs: sudo mdadm --verbose --create /dev/md0 --level=10 --chunk=256 --raid-devices=1 ...
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298 views

Is it possible to either abort or interrupt and later continue a lvconvert -m1 operation?

I have run the command lvconvert -m1 rootvg/newroot /dev/sdb to convert a linear logical volume to a mirrored one. The operation has not yet finished; I interrupted the command with ctrl-c at ...
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103 views

Two drives, how can i max reliability and uptime? [closed]

I have an asterisk pbx. It has 2 drives in a raid 1 setup. However if my main drive fails my 2nd won't boot, as it has no boot partition. The most important thing for me is up time. If there is a ...
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237 views

How do I make a volume within a LVM survive a reboot?

I have a xenserver that has a local ISO repository created following Inside the LVM found at this link: ...
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601 views

Creating raid1 array with mdadm cuts space

I'm trying to create RAID1 mirrored disks on already deployed system (CentOS 6.4). I have two disks: source /dev/sda with the OS and /dev/sdb which will be the mirror. The disks are connected from ...
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503 views

Multiple 2 TB LUNs — ZFS or ext4-over-LVM

I am going to deploy an Ubuntu 12.04-based archiving system. Due to limitations of the SAN Storage, it can only present me with 2TB LUNs. So, I have to merge multiple 2TB LUNs to achieve the desired ...
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1answer
942 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 ...
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135 views

LVM - spanning single VG across multiple PVs

while configuring a small-business server (CentOS 6.4) I came across a doubt that I have regarding LVM managing and I was hoping you can help me clarify. The machine has the following storage setup: ...
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1answer
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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 ...
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152 views

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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1k views

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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96 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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59 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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134 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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1k 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 ...
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150 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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1answer
2k 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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519 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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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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189 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
3k views

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

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 is CentOS 6.4 64-bit The server in question is a HP ...
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323 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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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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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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347 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 ...
2
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1answer
346 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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93 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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121 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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1answer
543 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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1answer
140 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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474 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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100 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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693 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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2k 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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232 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
800 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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697 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 ...