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

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219 views

Mount LVM volume as external usb drive? CentOS 6

I'm trying to mount my old 2x500GB drives to the new server which has the same drive volume. Both have LVM structure but it's not working. root@server [/mnt/usb]# ls /dev/sd* /dev/sda /dev/sda2 /...
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1answer
548 views

Corrupt LVM metadata header after kernel update

I'm running Debian Wheezy (Linux wheezy3.2.0-4-amd64 #1 SMP Debian 3.2.63-2+deb7u1 x86_64 GNU/Linux) as an encrypted LVM with hardware raid 1 (Adaptec 6405E) on a supermicro server. I was encounting ...
3
votes
1answer
242 views

stdout redirect. sh: resource temporarily unavailable

I have large batches of bash processes. Each bash script invokes executeables which have their stdout redirected to distinct log files. About 5% of the runs end up with: sh: [name of log]: Resource ...
3
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147 views

Replicate a complex partition structure with LUKS and LVM volumes

I have two external hard discs on an OpenSUSE 13.1 system. On one I have created a partition structure: An encrypted LVM partition (LUKS) Several volumes (10) on this LVM partition, some formatted ...
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639 views

How to recover a physical volume in LVM that shows as an unknown device?

I've been wanting to learn more about LVM, so I finally have taken the time to dive into it. Being the very smart computer guy that I am, I had the great wisdom to experiment with LVM on one of my ...
3
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1answer
2k views

How do I resolve an error when booting, “Couldn't find device with UUID…”

I have a RHEL 6 system, running on a VMWare machine. The admin of the VM server added a second RAID volume to the server, which my RHEL system does not use. Now, when I boot the RHEL system, I get a ...
3
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228 views

LVM RAID 1 for root [closed]

I have LVM RAID 1 (not mdadm RAID 1, but exactly LVM2 RAID 1) for my root partition. I would like to make my system boot without either of the HDDs where the underlying PVs of the root LVM partition ...
3
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1answer
353 views

Having trouble with LVM snapshot

I have a funtoo linux machine which I am trying to add ubuntu to (thats a whole other issue). It is encrypted with luks and has lvm on top of that. I have a 2 TB harddrive (sdb) which I would like ...
3
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0answers
304 views

Setup Cloudmin on Centos installed in LVM

I installed CentOS 6 with default LVM partition pattern. according to this pattern Can I use Cloudmin and store KVM Disks in LVM as Logical Volume? I think Cloudmin requires creating new logical ...
3
votes
1answer
349 views

Create Logical Volume Snapshot at boot and before mount

I'm using Kubuntu 11.10 and before I upgrade to 12.04, I want to make snapshots of my filesystems. Coming to think of that, I realized that it can be very useful to create snapshots of logical volumes ...
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10k views

LVM2 can not wake up suspended logical volume

Read my story below. I'm using LVM2 with following information: Scan for VG: # vgs VG #PV #LV #SN Attr VSize VFree unix 1 1 0 wz--n- 115.00g 45.00g Scan for LV # lvs LV ...
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2answers
302 views

after adding one more physical volume and enlarging logical volume, grub fails

Several years ago I installed Debian on my 500 GiB hard disk. During installation I chose to have encrypted filesystem. So installer created one small unencrypted boot partition (I guess that grub ...
2
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1answer
904 views

Why are there symlinks in /dev? (LVM)

[root@SERVER ~] ls -la /dev/vg/root lrwxrwxrwx 1 root root 17 2012-10-28 10:29 /dev/vg/root -> ../mapper/vg-root [root@SERVER ~] QUESTION: Why are there symlinks? Why there couldn't be only 1 ...
2
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3answers
648 views

Resizing LVM within a in KVM-based VPS

I have a VPS (based on KVM, not sure which storage technology) for about two years now. It's mainly a learning machine, a utility proxy, or a seldom-used VPN gate, or whatever--no real work, no ...
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2answers
579 views

How come lvextend allocates less than the specified amount of space?

I am trying to extend a volume, let's call it /dev/vol1. I see the initial volume size is 500MB when I call: df --block-size=M /dev/vol1 then to extend it 100MB more I call: lvextend -L+100M /dev/...
2
votes
1answer
2k views

mdadm raid0 with disks of different size?

Currently I'm using LVM just to merge a few disks of different size. I want to know if it is possible to use mdadm with stripes instead of LVM? Will it give me additional performance? Will it use ...
2
votes
1answer
521 views

How to extend an ext3 partition over LVM inside a file (virtual machine)?

I need to extend the root partition of a virtual machine (VM) using LVM (Logical Volume Manager). I can afford a few minutes of downtime so a VM shutdown/reboot is fine. The virtual hard disk is in ...
2
votes
1answer
271 views

Device node LVM

There is mention of a device node, when I was reading about LVM. I can't find anything useful as to what it is or functions as. Any help or suggestion of where to look would be appreciated.
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2answers
3k views

How to change dm_crypt aes/256 LVM password after install?

I installed Fedora 14 & Ubuntu 10.04 LTS on my PC. I used dm_crypt/LVM with aes256 in both installs (2 VolumeGroups, each encrypted, so there is 2 separated & encrypted linux distro on this ...
2
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1answer
42 views

Why the ext4 filesystem can be shrunk only when not mounted?

I'm playing a little bit with LVM. I've noticed that I can add a new HDD, include it in the volume group, and add some space to all of the existing volumes without unmounting theirs filesystem or ...
2
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1answer
80 views

swapon command is not listing the lvm name

I am facing issues with swapon -s command. It is displaying some other filename instead of my lvm name which i have given ( swap is LVM partition ) swapon -s command is not listing my LVM Name for my ...
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2answers
971 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 ...
2
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1answer
1k views

Is it useful to setup RAID0 on laptop? [closed]

I have a Dell laptop, which I am going to replace the CD-ROM hub with a HDD. I am thinking if I setup a RAID0 on my original HDD and the new HDD, would I have some I/O performance improvement? ...
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2answers
115 views

How to configure hard drive

I have a hard drive that is not configured, it shows this in fdisk -l: Disk /dev/dm-2: 107.4 GB, 107369988096 bytes 255 heads, 63 sectors/track, 13053 cylinders Units = cylinders of 16065 * 512 = ...
2
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1answer
9k views

fdisk isn't showing my hard drive as properly formatted (but it is)

I've got 3 1TB drives which I've set up to use LVM. Here's the output of pvdisplay: --- Physical volume --- PV Name /dev/sda1 VG Name vgpool PV Size ...
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2answers
4k views

Moving /usr to its own filesystem/logical volume

My Fedora 17 (x64 - running on VMware Workstation 8) root filesystem is running out of space (this was an install using the default layout as suggested by the Fedora installer): # df -h Filesystem ...
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2answers
6k views

How to check LVM mirroring under Linux?

How can I check the LVM mirroring under Linux? E.g.: are there any mirrors on a given machine & some details about them, etc.
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1answer
2k views

how to check the filesystem type of a logical volume

How to check the filesystem type of a logical volume using lvm or any other utility.. For example, if my logical volume is /dev/vg1/lv1 then how to check its filesystem type ? I have made a ext4 ...
2
votes
1answer
54 views

Secure deletion on BTRFS in LVM

I have a BTRFS filesystem in an LVM logical volume, which exists inside of a LUKS disk. For reference's sake, let's call the LV lvm-root, and the LUKS disk crypt-root, and the BTRFS filesystem fs-root....
2
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1answer
38 views

After changing LVM, I have “residue” of old PV's

I used to have an LVM LV based off of two smaller disks. I introduced a new, much larger disk, migrated the data, and retired the old disks. Everything works fine. The 3Tb disk /dev/sdb1 is fully ...
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1answer
314 views

SSHD drive caching algorithm vs bcache/LVM

I read somewhere that the algorithms used by LVM/bcache are much better than the algorithms implemented by the H-HDD/SSHD drives. Is it true?
2
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1answer
837 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 ...
2
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1answer
38 views

Can one physical disk provide space for several volume groups?

Can one physical disk provide space for several volume groups? Or one disk can have only one volume group in the Linux LVM? Can we use one disk in several VG's?
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2answers
438 views

Does the debian setup with lvm also encrypt the swap partition?

I'm planning a fresh debian install on my notebook and want to have full disk encryption. But I mainly hibernate, which is why I want my swap to be encrypted as well. During the graphical expert ...
2
votes
1answer
851 views

Replace hard drive in ubuntu

I know variants of this question have been asked before, but I couldn't find a specific answer to my situation. So here goes: Running ubuntu server 12.04 with the os on a separate drive and two 1,5 ...
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1answer
1k views

bootloader configuration with GPT, RAID1, and LVM

Using the GUID Partition Table and RAID 1, the bootloader (syslinux or GRUB) is not able to boot into the machine, which was installed with Arch Linux. First off, there are two drives identical ...
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2answers
282 views

Why is LVM metadata backed up to /etc/lvm and not /boot?

Recent question I saw got me thinking on this particular point: If bootloader restrictions usually cause /boot to be outside LVM, why isn't this the target of LVM metadata backups? Putting it ...
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1answer
890 views

Equivalent to “copies=2” feature of ZFS in Linux with LVM

I have a laptop with only one HDD and is impossible add other HDD. The feature "copies=2" of ZFS is the perfect solution for to add redundancy to my /home in the laptop. I would like emulate the ...
2
votes
1answer
469 views

Guide for Gentoo setup with full disk encryption using LUKS+LVM

I'm looking for a way to make the following setup happen in Gentoo: /dev/sda1 -> /boot (ext2) /dev/sda2 -> Luks encrypted | +-lvm-vg1 | +- /dev/mapper/root-fs -> / (ext4) +- /dev/...
2
votes
1answer
2k views

grub-install : File descriptor 3 leaked on vgs invocation

I installed Debian Jessie on a LVM in a software RAID 1. To make sure MBR are written on both disks of the RAID 1, I run dpkg-reconfigure grub-pc (as suggested here) and select both disks. I get ...
2
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1answer
3k views

Debian error message: “Unable to find LVM volume”, but then boots successfully

I was trying to encrypt all the HDD during the installation process of Debian 8 Jessie using full disk encryption + LVM, and I did it, but, there are a little "problem". Before the system asks me the ...
2
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5answers
201 views

space-efficient disk snapshots on Linux

I like the ability of VirtualBox to instantly create and restore snapshots and I was wondering, if it's possible to do similar things on the host machine. First I looked at lvm snapshots, but some ...
2
votes
2answers
983 views

How to add a dm-cache to an already existing luks setup?

I've got two physical devices, a fast SSD and a large HDD. The SSD is in VG ssd and ends up serving as mountpoint /, the HDD is in VG dump and serves as mountpoint /home. Both go through LUKS for ...
2
votes
1answer
238 views

RAID1 that can be enlarged when adding a new disk: convert to lvm --type raid1? [closed]

For the last ten years, I have been making inexpensive servers for small businesses. Each server has two identical drives mirrored with raid1. Later, SATA became available, then eSATA. In the past,...
2
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1answer
831 views

Physical volumes, logical volumes, superblocks gone… how to boot?

A story fairly similar to this one happened to me yesterday. Update: My only hard drive /dev/sda was originally partitioned this way: Device Boot Start End Blocks Id System /dev/...
2
votes
2answers
950 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 ...
2
votes
1answer
1k views

Multipath to a logical volume in a staging VM

How do I configure multipath in testing VM (purpose is purely academical)? I made new logical volume, modified multipath.conf to be as follows: defaults { udev_dir /dev ...
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votes
2answers
1k views

Restore formated Partition Table on LVM Physical

I have a machine (guest VM running CentOS 6.5) with 2 disks. Main OS on sda and then a 2TB LVM on the second sdc. I added 2 more 2TB disks to the machine and was going through the process of ...
2
votes
1answer
197 views

Why is df -h size, util and dispo not corresponding to each other

When I'm using the command "df -h" I'm having the following output : Filesystem Size Used Avail Use% Mounted on /dev/mapper/fedora-root 20G 9,4G 8,8G 52% / devtmpfs ...
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2answers
960 views

Transfering whole linux system to a new disk

Few weeks back I installed linux as a virtual machine on my windows 7 system but I didn't gave much thought to(or miscalculated) the size of various partitions and even worse I'm not using 'lvm'. ...