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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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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Libvirt does not see updated LVM volume

All VMs run off an LVM pool. I resized one of the LVM volumes to increase VMs drive copacity. Resized it with lvextend as usual. Everything is successful and lvs shows the new size. Libvirt does not ...
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33 views

unmounted logical volume is “busy”?

I'm trying to shrink an ext4 filesystem on a CentOS 6 server. I did a lazy unmount of the filesystem while I waited for some processes to finish running. They've all finished running but I can't ...
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Can LVM VG Contain PVs With Different Filesystem Types

Assuming of course, that both filesystems support LVM functionality. I originally thought yes, since this is an abstraction layer, but when googled couldn't find a direct confirmation.
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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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Disorganized disks because of different disk technologies - LVM an answer?

I have a 1 TB spinning HD, and a 256 GB SSD. I keep my OS and large projects on the SSD, for speed. The rest is on the spinning HD, because of its size. The problem: This means I have things to ...
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176 views

How to extend LVM PV to the beginning of disk?

I have server with 2TB disk, that someone initially partitioned like this: 300GB standard primary partition for operating system files(CentOS 7). 1.7TB LVM with some pretty big logical volumes - for ...
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18 views

Reverting LVM to separate partitions

I have an VMWare Virtual Machine (Ubuntu Server 11.04) that's using three VMDKs, then all of them are parte of an LVM. The problem I'm facing is at the creation time every one of those VMDKs were ...
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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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11 views

New Swap Drive - Linux Hangs during Boot

An application checked the swap space during install and required it to be the same amount as ram. So i added a new disk (Server is a VM) and done the following: swapoff /dev/mapper/ol-swap vgcreate ...
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Bit copied a disk image using the dd command to a new and bigger disk. How do expand whole LVM? [duplicate]

I just copied a 50 GB disk image using dd for bit copying to a new harddisk with 200 GB storage. On the disk is LVM including the system partition EXT4 and a swap partition (both LVs). Well the copy ...
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Combine grub2 + GPT partition + LUKS + LVM (grub overwrites LUKS header) [migrated]

I'm trying to configure system to boot from one GPT encrypted LVM partition. But when I set partition type to 8300 grub-install complains on warning : this GPT partition label contains no BIOS boot ...
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1answer
22 views

Use Lvm snapshot for a new (KVM) virtual machine

I need to migrate one CentOS5 (32bit) physical server to in a virtual machine. My idea is to take a snapshot of the LV and then import in kvm creating a new vm. Is this a good idea? More precisely, I ...
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1answer
52 views

Are bcache and/or dm-cache considered stable for production in 2016?

I would like to use linux SSD caching (dm-cache or bcache) with Debian Jessie production servers. (kernel 3.16) My question: Are dm-cache and bcache modules reliables in linux 3.16 ? Do I need to ...
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28 views

LVM partition not available after creating partition while mounting

This is what I needed, 1. Add new disk 2. Create New pv, vg and lv as per below plan Plan /dev/mapper/PJR_sapvg1-USR_SAP_PJR /usr/sap/PJR/sapmnt/GJR 20Gb /dev/mapper/PJR_sapvg1-SAPMNT_PJR ...
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43 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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How to resize an LVM if default block size is changed to 1K from 4K

I am working over RHEL 5.4 and using LVMs over the storage LUNs for storing my files. Each LVM infact reaches the size up to 16TB on ext3 even. And my server is in production. Just for introduction of ...
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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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22 views

How to use lvconvert with two disks for mirroring? - Insufficient suitable allocatable extents

On a RHEL 5 I have to create an LVM mirror from multipath disks. There are enough free extents, but - on two disks, because the VG was made out of 4 disks. [root@SERVER ~]# pvs -v --segments | head ...
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35 views

Copy centos 6 modify mdadm raid 1 and clone to new mdadm raid 1 ssd

I have: Centos 6.7 grub-install -v grub-install (GNU GRUB 0.97) lsblk two new SSD 128gb Live usb with Parted_Magic_2015.03.06 /boot/grub/device.map # this device map was generated by ...
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LVM Raid 1 + SSD Caching

I have three disks: /dev/sda slow hdd /dev/sdb slow hdd /dev/sdc fast ssd /dev/vg0 volume group consisting /dev/sd{a,b,c} Each logical volume (lv) should be raid1 mirrored and ssd cached. With ...
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32 views

Scan only new files whit clamav [duplicate]

I have a cron script witch makes snapshots every day and scan the whole partition whit clamav. But if possible it would bee a better idea to scan only the modified files i think. The snapshot is ...
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External Drives on RAID/LVM configuration

I had 2 drives corrupted and now replaced with new ones sitting on RAID 0. After installing the new drives I have attached the 2 old corrupted drives via usb to retrieve data from them. These 2 drives ...
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57 views

low write disk speed of windows kvm guest with LVM

I have a trouble with my windows 2008 R2 KVM guest. It write speed to disk extremely slow: But on another VM (windows 10) on this KVM host write speed is ok: # cat /etc/system-release CentOS Linux ...
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60 views

Server fails to boot with lvm error : ¨Invalid argument for --available: ay Error during parsing of command line.¨

We have problems with our storage server, it was not updated for a while so we tried to updated it, tho during the update process (it needed some 2k package updates) it totally blacked out. (no screen ...
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23 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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19 views

LVM2: Can I change the LV size (not COW-table size) of a snapshot?

I'm curious if it is possible to create a snapshot of (e.g.) 10G volume, and then resize the snapshot to be 20G, along with the file-system within? Using lvresize or lvextend only alters the ...
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1answer
21 views

LVM thin snapshot unavailable

To test out thinly provisioned snapshots before applying them to a production system for backup purpose, I did the following: lvcreate -L1G -T storage/thinpool lvcreate -V10M -T storage/thinpool -n ...
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211 views

Extremely slow disk speeds Centos 6

Setup looks as follows: + HP Proliant DL380 G7 + 6 x 3TB Sata drives (surveillance level) configured with hardware RAID 1+0 with the SATA controller on board. Model is Seagate SV35 + 192GB RAM ...
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How to unlist partitions from fdisk command in linux

While working on one of my server I noticed that there are no partitions listed under "fdisk -l" command. However the machine is working just fine. Wanted to know following things if anyone can help. ...
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47 views

Merge Logical Volume groups

I want to increase root LVM volume space. Is it possible to merge LogVol01 to LogVol00? My LVM setup looks like this: [root@server~]# lvs LV VG Attr LSize Origin Snap% Move ...
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Transaction id mismatch on thinly provisioned LVM-Volumes

I have setup a thinpool with 3 thinly provisioned LVM volumes inside. After increasing the size of those I did run into serious problems and now I would like to remove the thinpool in order to start ...
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97 views

Can't remove LVM thinpool - unable to deactivate tdata, tmeta

I somehow messed up some thinly provisioned lvm volumes on ubuntu 14.04 and now I want to start fresh by deleting the thinpool with all its volumes and data inside. Unfortunatelly this failes and I ...
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How to mount large LVM image on ubuntu 14.04 on root?

I am running ubuntu 14.04.03 and need to mount thinly provisioned lvm volumes for glusterfs to the system. I did this first by adding them to /home/glusterfs/dir, this worked as /home has 120G of ...
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55 views

lvs output : Data% column

Following is a example of standard lvs output: LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert POOL VG twi-aotz-- 399.80g 28.12 14.75 ...
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35 views

Volumegroup using entire disks instead of partition - Extending online Vmware

Is it possible when using entire disk for volume groups to extend the assigned disks space from the vmware console, and then online the volume group after rescanning host to know the new size, or to ...
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Mirroring on external SCSI and iSCSI disks inside same volume group

On IBM P5 505 (maint level 5300-07) servers there is a concurently accessed external storage, which is connected using external Ultra320 SCSI port (DAS). External storage is detected as hdisk2 which ...
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1answer
26 views

Change partitions of disk with RAID and LVM

TL;DR: How to combine RAID + LVM partitions online (not touching rootfs)? I have a server which was used for something else before and had a certain partition structure create. df -h shows ...
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95 views

Mirroring VGs between two Linux server

I have two nodes , each has 20 HDDs (identical size) . Both nodes are configured with 2 VGs , each VG was created using 10 disks . 1 VG is called SAN the 2nd is called NAS . Node1- will provide nfs ...
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How to stop unmounting of lvm volumes when autoextend fails?

We are using lvm thin pools with autoextend enabled: thin_pool_autoextend_threshold = 80 thin_pool_autoextend_percent = 10 This is how we create the pool and the volumes: pvcreate /dev/sdb ...
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31 views

extend sda partition under LVM

My server has 4 primary partitions with data I can't delete but I need to extend the hdd as it is running out of space. I already increased the size of the vmdk file but when I try to create a ...
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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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lvm PV on top of dm-cache

I am running a private cloud (opennebula, KVM) where I am running VMs both directly using LVM Logical Volumes and using disk images on a file system (one is faster, the other is easier to migrate), ...
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228 views

Insufficient free space: X extents needed, but only Y available

I'm trying to extend a LVM in a Vmware Workstation 12 Pro CentOS VM. Below are the steps I am following and where I stopped because don't know how to folow from there: Create the primary partition ...
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Set up DRBD to replicate root LVM volume

I have a server using /dev/vg1/root as its / mount. I am trying to set up DRBD so that ServerA's vg1-root is mirrored to another LVM volume on ServerB, vg1-ServerA-root. I am able to create the ...
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LVM Reduce a RAID6 array

I made the mistake of setting up RAID6 using LVM directly. For better flexibility, I need to switch to managing RAID through MDRAID. Is there a way I can reduce the size of the array (freeing up ...
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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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Figure out the used space on the snapshot thin volume

I have the following lvm 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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2answers
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How to mount new logical volume (adding to fstab and mtab)?

I created a new LV for the first time using this command: lvcreate -L 20G -n iew-vm-lv /dev/ubuntu-vg #create the new LV When I try running mount /dev/ubuntu-vg/iew-vm-lv, I get the following ...
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How to mount a this logical volume

I would like to mount /dev/sda2. How am I supposed to do that? Bellow is the output of fdisk, df, lvmdiskscan, lvdisplay, vgdisplay, lvscan. [root@IctThtSoluti-06 ~]# fdisk -l Disk /dev/sda: ...