Logical Volume Management provides storage abstraction, a generalization of disk partitioning.

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KVM linux guest, 2nd HDD, LVM partition or whole disk

I've got a RAID 10 arrays on a couple of KVM host machines. The RAID 10 array is one big VG. I usually create a small LV for guest disk image storage then the rest of the VG I carve out as LVs to add ...
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0answers
209 views

Unmount external drive with LVM2 Physical Volume on it

I've got my Ubuntu 13.04 install backed up to my external hard drive using deja-dup. I formatted the drive with lvm so I could use the rest of the drive for external storage while having the resize ...
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0answers
2k views

What steps can I use to recover a RAID 1 array with LVM and EXT3 on it?

Someone handed me a drive that used to be part of a RAID 1 (mirror) array. The drive apparently has LVM (1?) on it and EXT3 (I believe). What steps can I take to regain access to this drive? ...
2
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1answer
298 views

LVM issue with VM - Physical disk not present

Am trying to troubleshoot an issue that has arisen during a DR test and admit from the outset that LVMs are not my forte. We have a RHEL6 VM running on ESXi 5.1. We are using a LUN to LUN ...
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2answers
8k views

Change Partition Table with GParted

I have an Ubuntu 12.04 LTS server that has 6x600GB SAS drives in a RAID 5 configuration (Perc 6/i). The partition scheme looks like this: Partition File System Mount Point Size /dev/sda1 ...
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1answer
344 views

LVM keeping harddisk awake?

I have a Lenovo W530 running Arch with kernel 3.79 (for bumblebee) and laptop-mode is configured properly and running. It has one SSD (sdb) and one harddisk (sdb). The sdb disk has two lvm-volumes: ...
2
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1answer
711 views

Problem with permissions when sharing a mounted filesystem

I am setting up a linux to act as a fileserver, using CentOS 6.3. Since I want to have disk quotas and can't install LVM (it is a 32 bit machine), I am using an LVM volume with ext4 mounted as ...
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1answer
3k views

Install Backtrack 5 r2 into running LUKS setup installed with ubuntu

One Harddisk (sda) Two Partions. With a working ubuntu running. 1) /boot 2) LVM with this virtual volumes/partions/ or whatever they are called inside: Swap Ubuntu Home Prepared for Backtrack Of ...
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603 views

Migrate an entire volume group LVM2 to RAID5

I have a Virtual Host server build with Ubuntu and Xen SO Ubuntu 12.04.1 LTS 64Bits xen-hypervisor-4.1 Disk Hitachi SAS 15K 147GB (x2) in a Volume group sda1 1GB /boot sda2 146GB lvm sdb1 ...
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3answers
42 views

Resize an existing LVM partition and add the space to another LVM partition

I'd like to resize an existing LVM partition and add the space to another LVM partition. [root@dckapstaging ~]# df -h Filesystem Size Used Avail Use% Mounted on ...
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2answers
125 views

How to find the underlying disks of a mirrored volume in LVM (linux)?

When I run command lvs -a the output shows the logical volumes from which the mirrored-volume has been made but how to find the actual disks from which the sub-logical volume were allocated. Any ...
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2answers
5k views

How to extend LVM in RHEL 5.6

I need to extend the LVM on one server. This is the output of df -h: Filesystem Size Used Avail Use% Mounted on /dev/cciss/c0d0p2 58G 26G 29G 48% / ...
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2answers
2k views

How to resize logical volume to fit filesystem

How can I resize logical volume to fit filesystem automagically?
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2answers
76 views

What's the difference between a partition and physical volume?

Why can't we directly create a volume group over a disk without creating a physical volume from it? What is a physical extent? Do we even have physical extents in a partition?
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1answer
258 views

Is fdisk needed with lvm?

Most documentations about LVM have roughly these steps: fdisk /dev/sdb pvcreate /dev/sdb1 vgcreate fileserver /dev/sdb1 lvcreate --name share --size 40G fileserver mkfs.ext4 /dev/fileserver/share ...
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2answers
2k views

What does a mirrorlog do in LVM mirroring?

http://www.tcpdump.com/kb/os/linux/lvm-mirroring/intro.html states that when mirroring a Logical Volume in LVM we need a "A volume for the log "... ehh, what exactly is a mirror log? Is it always ...
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97 views

Increase root partition by reducing /home

Hi I need to increase root partition space by reducing /home, in a Centos 6.6,my situation is this: /dev/mapper/VolGroup-lv_root 50G 46G 1,6G 97% / tmpfs 1,9G ...
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1answer
94 views

Creating separate volume for /var/log/ and /var/log/audit/

I need to migrate /var/log/ and /var/log/audit to separate volumes. Currently the entire /var/ directory is on a logical volume with ample space (45G). I understand how to shrink and create new ...
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2answers
179 views

How to obtain info about physical volume as non root user

Hello the pvs command gives me the following output: PV VG Fmt Attr PSize PFree /dev/sd** ***** lvm2 a- 59.49g 47.49g /dev/sd** ***** lvm2 a- 25.00g 8.00m This only works if ...
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2answers
2k views

mount: warning: /etc/mtab is not writable (e.g. read-only filesystem)

Working on my system I noted that the root filesystem is mounted read-only. My system worked for months, today I get this error: mount: warning: /etc/mtab is not writable (e.g. read-only filesystem). ...
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1answer
3k views

Is there any way to do a CentOS minimal install without LVM / ext4?

I'm trying to benchmark the disk throughput of a base CentOS install on my lab XenServer setup, and am installing from the CentOS 6.4 minimal CD. However, the install ISO boots into a text-mode ...
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1answer
494 views

Cannot mount filesystem under luks. Device does not exist

I made one big luks device and re-used it on my debian install, then i ran into some boot problems and i need to acess the filesystem. The problem is, i decrypt the luks device and when i try to ...
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1answer
428 views

Turn on Swap after resize /

I resized with lvresize the swap from 4 to 2G and can't turn it on. swapon /dev/VolGroup/lv_swap swapon: /dev/VolGroup/lv_swap: swapon failed: Invalid argument lvdisplay /dev/VolGroup/lv_swap ...
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1answer
23 views

KVM host, add LV to guest

I have a KVM host with a software RAID 10 array. The software RAID 10 array is a PV on the host and there's a single VG. I have a couple of LVs used at the host level (a datastore for KVM guest .img ...
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1answer
33 views

Using the SSD area of a H-HDD drive with LVM/bcache

I heard that LVM/bcache can be used in Linux to store the most accessed files if there is a separate SSD drive. With a hybrid drive (SSHD/H-HDD), can the flash area be manually used by LVM/bcache as ...
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1answer
49 views

Move data from regular partition to lvm

I've read a bit about lvm and decided that I want to switch to using it. It seems like actually setting up lvm can be done from the debian installer, so I suppose that'll be easiest. What I'm not sure ...
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34 views

need to repartition logical volumes

I have bad balance between my root/home LVs. Please note that I'm extremely new to understanding disk management and Linux in general, so I'm probably going to say a few things incorrectly. My goal ...
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2answers
218 views

Why it is not recommended to put boot partition on lvm?

I read somewhere that it is not recommended to put boot partition on lvm based partition. But, I'm doing it anyway. Then the only problem I've faced on this is sometimes when I install a new Linux ...
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2answers
95 views

VGEXTEND: How to avoid wiping a swap signature in /dev/sda3?

The problem: [root@195623 ~]# vgs VG #PV #LV #SN Attr VSize VFree fedora_195623 1 3 0 wz--n- 9,50g 0 [root@195623 ~]# vgextend fedora_195623 /dev/sda3 WARNING: swap ...
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1answer
265 views

How can I recreate removed LVM Logical Volumes?

I accidentally removed all my Logical Volumes with lvremove. After reboot the lvm backups were lost (live CD) so I can’t use vgcfgrestore. testdisk can find the partitions by analysis so they are ...
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1answer
122 views

Experimenting with Xen on already running Debian without LVM

A co-worker of mine was telling me about using Xen for virtualizing systems on Debian, and it peaked my interest. I looked up the instructions on Debian's Wiki regarding installation. I already have ...
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1answer
570 views

How to make grub mount encrypted LVM partition

I have such boot sequence: system boots from external disk, right after start it asks about password for LVM encrypted partition (which holds /root and /home), I enter it, the partitions are mounted, ...
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1answer
120 views

LVM Snapshot mount read-only or not?

In this page of Linux LVM Howto it's said that "LVM2 creates read/write snapshots by default". In this other page of Red Hat docs it's said that "Because the snapshot is read/write, you can test ...
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2answers
146 views

How to reduce and remove Physical Volume from active Logical Volume?

For testing purposes I've tried to extend my logical volume by attaching one more Physical Volume (USB drive). Making the USB drive part from the logical volume with the following steps: Created ...
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1answer
58 views

LVM + LUKS partition - Is this architecture dependent or independent?

I've been recently dealing with an LVM + LUKS partition trying to install a new linux (ubuntu in this case). I tried a few different options to make it work, but the pc resisted, the only system I ...
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2answers
586 views

Very poor read performance compared to write performance on md(raid1) / crypt(luks) / lvm

I'm experiencing very poor read performance over raid1/crypt/lvm. In the same time, write speeds are about 2x+ faster on the same setup. On another raid1 setup on the same machine I get normal read ...
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1answer
246 views

How can we resize the LVM in Fedora 17?

I was trying to install Backtrack along with Fedora 17. While installing the BT I found there was no free space in my system. When I checked the FS in Fedora, all my space in HDD is used as LVM.
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1answer
836 views

LVM hangs while trying to create my root device node

Followup to How can I check for bad blocks on an LVM physical volume? The title mostly sums it up. Basically, I have a box partitioned with a regular /boot partition and then an LVM physical volume ...
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1answer
98 views

Is it safe to reformat an lvm root partition?

My system currently has a volume group containing root, swap, and home logical volumes. I would like to reinstall the operating system in the root volume and format the partition in the process. I ...
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1answer
120 views

How can I use two HDD as one on Debian?

I have installed Debian on my server with a 250GB HDD. Now I have bought another HDD that is 2TB large, but I don't know how I could use that 2TB with my webhosting solution. I heard about LVM, but ...
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2answers
800 views

Transfer a Fedora system to another computer

I'd like to transfer my Fedora to a remote machine. Fedora is under Grub 2.0 and on the remote machine there is a Centos system and Grub 0.97. In fact, I have two questions. First is how to properly ...
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1answer
206 views

Reading encrypted partition with broken LVM2 inside?

I overwrote some LVM2 metadata in much the same way as Recovering overwritten LVM metadata . That is, I attempted to install Debian 6.0.7 on a system with existing encrypted volumes and LVM2 volumes. ...
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2answers
675 views

Should I be worried? Segfaults reported in syslog when merging LVM snapshot (reverting the original back to the snapshot)

I was just experimenting with snapshots in LVM on Ubuntu 12.10. I created a snapshot logical volume of 6.5 GiB, and after making some changes to the origin decided to merge the snapshot back in to ...
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1answer
1k views

Need to change the mount Point of LVM /u001/app/oracle to /u001/

This is the situation.I installed the RHEL 5.5 on client's system and created LVM mount point at /u001/app/oracle and now he has installed DB on /u001/app/oracle. He is asked me to change the mount ...
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1answer
689 views

Complete install on RAID1 + LVM

When doing a complete install of Linux is it possible to install everything including /boot on 2 software RAID 1s (4 hdds) + LVM? I haven't been able to figure out whether this is definitely ...
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1answer
872 views

Partitioning scheme for a virtual machine host

I am planning to use an Ubuntu Server 12.04 with KVM to create 2 virtual machines. Reading some docs on the net, I have found that a good approach is to use LVM based VM, so my idea is to have: 1 ...
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3answers
919 views

How to find all disks & their size before using them?

I need to know the following information, before using the harddisk to create logical volumes or database.. Any perl modules or snippet would be of great help. how many hard disks are presented to ...
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1answer
146 views

# of reads/writes for LVM vs. “regular” partitioning?

I am going to be installing linux to a USB flash drive (an actual install, not a "live usb"). I need it to be completely portable, so I can't realistically have the high-access partitions (swap, var, ...
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1answer
691 views

Resize a Physical Volume, resize2fs won't work with it

I need to resize my PV so that I could make room for a new partition, /dev/sda7 --> belongs to Volume Group: vg0 vg0 has 23g free space not allocated, so I tried pvresize ...
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1answer
7k views

How to decrease the size of a logical volume/fs aix?

oslevel -s 6100-03-03-0943 IF I have a Logical Volume that I need to shrink, then how can I do it? [there could be several FileSystems on it...]. What is the process?