Debian :: LVM Setup With 3 Logical Volumes?
Nov 25, 2010
I have done a recent install of Debian squeeze on a laptop. I set up LVM with 3 LV's, one for the root filesystem, one for /home, and another for swap. I then used lvextend to increase the size of the LV's. This additional space is shown if I enter lvdisplay (shortened for clarity):
- Logical volume -
LV Name /dev/auriga/swap
LV Size 4.66 GiB
- Logical volume -
LV Name /dev/auriga/root
LV Size 15.97 GiB
- Logical volume -
LV Name /dev/auriga/home
LV Size 169.01 GiB
However, if I use df, it still shows the previous size.
/dev/mapper/auriga-root 14G 8.0G 5.2G 61% /
/dev/sda1 221M 16M 193M 8% /boot
/dev/mapper/auriga-home 147G 421M 139G 1% /home
I have even tried restarting as well. I do not understand why df would still show that /home is 147GB, when I extended it to 169GB using lvextend. Similarly for the root, which was extended by 2GB from 14GB to 16GB.
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Apr 24, 2011
I have let the debian installer set up with separate partions forrootusrvarhometmpIt ended up with a huge home partition and little place for the others.So I wanted to give some of home's space to the others and didlvreduce on homelvextend on the others.Following some info on the net it tells you toe2fsck -f partition1 followed by aresize2fs partition1But when I try to fsck the reduced home partition I got the following error:The filesystem size (according to the superblock) is 73113600 blocksThe physical size of the device is 20447332 blocksEither the superblock or the partition table is likely to be corrupt!Abort? yesIs there any way to save this?
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Jan 28, 2010
I have a system where the logical volumes are not being detected on boot and would like some guidance as to how to cure this. The box is a Proliant DL385 G5p with a pair of 146 GB mirrored disks. The mirroring is done in hardware by an HP Smart Array P400 controller. The mirrored disk (/dev/cciss/c0d0) has 4 partitions: boot, root, swap and an LVM physical volume in one volume group with several logical volumes, including /var, /home and /opt.
The OS is a 64-bit RHEL 5.3 basic install with a kernel upgrade to 2.6.18-164.6.1.el5.x86_64 (to cure a problem with bonded NICs) plus quite a few extras for stuff like Oracle, EMC PowerPath and HP's Proliant Support Pack. The basic install is OK and the box can still be rebooted OK after the kernel upgrade. However, after the other stuff goes on it fails to reboot.
The problem is that the boot fails during file system check of the logical volume file systems but the failure is due to these volumes not being found. Specifically the boot goes through the following steps:
Red Hat nash version 5.1.19.6 starting
setting clock
starting udev
loading default keymap (us)
setting hostname
No devices found <--- suspicious?
Setting up Logical Volume Management:
fsck.ext3 checks then fail with messages: No such file or directory while trying to open /dev/<volume group>/<logical volume> There are also messages about not being able to find the superblock but this is clearly due to the device itself not being found. If I boot from a rescue CD all of the logical volumes are present, with correct sizes; dmsetup shows them all to be active and I can access the files within. Fdisk also shows all the partitions to be OK and of the right type. I am therefore very sure that there is nothing wrong with the disk or logical volumes....
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Jan 8, 2011
How would I go about encrypting my lvm2 logical volumes on Debian Squeeze? Is it possible without backing everything up to a different drive and restoring afterwards?
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Jun 23, 2011
I've read the first 40% of the RHEL 5 Logical Volume Manager Administrator's Guide, but still have one outstanding, burning question.
During the installation of Centos 5.6, I set up LVM physical volumes, volume groups and logical volumes. I can list these using pvdisplay, vgdisplay and lvdisplay commands.
How would I list what filesystems I have that are using my logical volumes?
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Sep 15, 2010
Are there any maximum amount of logical volumes a LVM2 volume group can contain?
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Nov 15, 2010
I upgraded aaa_elflibs as per Eric's advice here:URL..Now I can't access anything.it boots into tty1 and won't mount any of my logical volumes.
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Jan 6, 2011
I am trying to use e2label to label one of my Logical Volumes. the labeling is done successfully. but my findfs output is like this:
/dev/mapper/VolGroup00-TEST
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Jan 20, 2009
i cannot resize mounted lvm volumes with reiserfs by using yast like in a previous version 10.x !?
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Nov 3, 2010
I would like to ask if is it possible to boot Slackware with the installation CD when in a pinch with a system on logical volumes? For the usual fdisk partitions the procedure is known:
Code:
boot: root=/dev/sda1 noinitrd ro or something like that. This way, the system boots with mounted basic partitions. My question is whether there is an option to achieve the same if the system is installed on logical volumes? I need to do this on a machine with dual booting Windows + Linux. The Windows needs to be reinstalled, but as is well known, the boot sector will then be overwritten. So after the Windows reinstallation I will need to boot Slackware with the installation CD and run lilo.
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Sep 9, 2009
Does everybody do major upgrades in place on production servers?Am I over-engineering by creating a new logical volume, syncing my working root volume to it and upgrading the new volume to test services? Then, after a week or 2 or 4, removing the old LV...
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Sep 11, 2011
I inherited a 3ware 9550SX running a version of gentoo with a2.6.28.something kernel. I started over with CentOS 5.6 x86_64.tw_cli informs me that the 9-disk RAID 5 is healthy.The previous admin used lvm (?) to carve up the RAID into a zilliontiny pieces and one big piece. My main interest is the big piece.Some of the small pieces refused to mount until I installed theCentOS plus kernel (they are reiserfs).The remainder seem to be ext3; however, they are not mounted at boot("refusing activation"). lvs tells me they are not active. If I try tomake one active, for example:root> lvchange -ay vg01/usrI get:Refusing activation of partial LV usr. Use --partial to override.If I use --partial, I get:Partial mode. Incomplete logical volumes will be processed.and then I can then mount the partition, but not everything seems tobe there.
Some of the directory entries look like this:?--------- ? ? ? ? ? logfilesIs it possible that the versions of the kernel and lvm that wereon the gentoo system are causing grief for an older kernel (andpossibly older lvm) on CentOS 5.6 and that I might have greaterfortunes with CentOS 6.x ?Or am I missing something fundamental? This is my first experiencewith lvm, so it's more than a little probable.
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Jul 9, 2011
So today I needed to switch from openSolaris to a viable OS on my workstation and decided to install openSUSE after having good experiences with it on my personal laptop. I ran into some problems partitioning one of the two hard disks installed on the system. I was limited on the amount of time I could spend at the office doing the install so I decided to use LVM on the one hard disk that seemed to work okay.
I picked LVM because although I don't know much at all about LVM, I at least know enough that it would allow me to expand the root and home partitions once I get the 2nd hard drive working correctly. So now that I've gotten the 2nd disk working okay, I've created two physical volumes on the 2nd drive, one to expand the root partition and one to expand the home partition. So, my question is, can I expand the root an home partitions while they are mounted or should I boot into a live CD environment before I expand the partitions? If I could expand them without booting into a different environment, that would be so great as I don't want to have to drive out to the office again before Monday. BTW, I am a new openSUSE user and an ex Ubuntu user. I loved the Ubuntu forums but had to switch because I do not agree with the direction that Ubuntu is taking.
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May 26, 2011
I have a setup that looks like this
[Code]....
and I'm dumped into recovery mode. However, if I remove these mounts from /etc/fstab via comments, I can wait for the system to boot (which it does very quickly) then mount the mapper devices myself. So what is going on? Has something changed wrt logical volumes, or is this just systemd? I can live with manual mounting, but any advice on resolving the automatic mounting situation would be great.
[Code]....
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May 15, 2009
what the maximum number of logical volumes is for a volume group in LVM ? Is there any known performance hit for creating a large number of small logical volumes vs a small number of large volumes ?
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Apr 1, 2009
I have Fedora Core 8 installed. I would like to reinstall it so as to get back commands that have been lost. To preserve my user data that has been stored in logical volumes, what selections should I make in the installation process? Are these selections essentially the same for Fedora Core 10?
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Feb 8, 2011
i have a fedora 11 server which can't access the ext4 partitions on lvm logical volumes on a raid array during boot-up. the problem manifested itself after a failed preupgrade to fedora 12; however, i think the attempt at upgrading to fc12 might not have anything to do with the problem, since i last rebooted the server over 250 days ago (sometime soon after the last fedora 11 kernel update). prior to the last reboot, i had successfully rebooted many times (usually after kernel updates) without any problems. i'm pretty sure the fc12 upgrade attempt didn't touch any of the existing files, since it hung on the dependency checking of the fc12 packages. when i try to reboot into my existing fedora 11 installation, though, i get the following screen: (click for full size) a description of the server filesystem (partitions may be different sizes now due to the growing of logical volumes):
Code:
- 250GB system drive
250MB/dev/sdh1/bootext3
lvm partition rest of driveVolGroup_System
10240VolGroup_System-LogVol_root/ext4
[code]....
except he's talking about fake raid and dmraid, whereas my raid is linux software raid using mdadm. this machine is a headless server which acts as my home file, mail, and web server. it also runs mythtv with four hd tuners. i connect remotely to the server using nx or vnc to run applications directly on the server. i also run an xp professional desktop in a qemu virtual machine on the server for times when i need to use windows. so needless to say, it's a major inconvenience to have the machine down.
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Mar 2, 2011
Is there a limit to the number of partitions/logical volumes you can create using the partman-auto recipes? If not, any thoughts on why my preseed using the values included below results in only a /boot partition and logical volumes root, swap, and user? Is there another way to achieve putting /, /tmp, /var, /usr, /usr_local /opt, etc on their own logical volumes with preseeding?
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Oct 21, 2010
I am very new to LVM, as well as not especially experienced at linux, and have some questions about how lvm works. A few months back I set up a server running FC10 and tried creating Logical Groups during the the initial setup. We've realized that we are not using all the available space on the physical drive, and I realized that for some reason (I'm thinking this might have been the default?), we initially created two Logical Groups (VolGroup00 and VolGroup01) and it appears two Logical volumes in each (LogVol00 and LogVol01). LogVol00 in VolGroup00 is mapped to /, and the other Group was actually unused. I figure that it would be simplest to just use all this space mapped to /, so I thought the thing to do would be to simply merge VolGroup01 to VolGroup00. I tried this:
[root@office mapper]# vgmerge VolGroup00 VolGroup01
Logical volumes in "VolGroup01" must be inactive
So after a bit of research, I tried this:
[root@office mapper]# vgchange -a n VolGroup01
Can't deactivate volume group "VolGroup01" with 1 open logical volume(s)
So apparently There's an open volume, but I don't know how to go about closing it. I removed the LogVol00 from that group, but LogVol01 won't budge.
[root@office mapper]# lvremove VolGroup01
Can't remove open logical volume "LogVol01"
So how do I go about closing this Volume? At one point, there was some output that told me LogVol01 was being used as swap space. How do I handle that?
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Aug 22, 2011
After fixing drive partition numbers, I got the following error from cfdisk: Code: FATAL ERROR: Bad logical partition 6: enlarged logical partitions overlap Press any key to exit cfdisk However, I can see all my partitions with fdisk and gparted, I can mount and use all of them.I used the following guide to fix the drive numbers order: Reorder partition drive numbers in linux | LinkedBits Does somebody know whet is cfdisks problem and how can I fix it?
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Sep 8, 2015
I have installed Debian through the Debootstrap process using the ext4 fs for root and it worked without a problem. When I tried to install Debian mounted on btrfs subvolumes, there are problems mounting root while booting so it crashes... Any clue if Debian supports btrfs subvolumes?
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Mar 25, 2010
How to access Windows volumes from non-root users?
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Aug 23, 2015
I'm having some issues with audio crackling/buzzing when turning up the volume, or on songs that have overclipped / overdriven parts, which doesn't happen on Windows (on it those sections are just "dampened"). Is there some certain settings in ALSA that are used to deal with this? Or is it something specific to the driver for the hardware? Speaking of which I'm using some integrated audio which goes by the name of Intel ICH7, and the chip itself is Analog Devices AD1981B.
I'm only using ALSA, without PulseAudio, and I've made sure the volumes both in the media players and under alsamixer aren't turned too high (PCM is at 47% and "Headphones" -- what is "Master" on Windows and on other soundcards under Linux -- is on 22%), so it isn't an issue with the software mixer being turned up too high. Also I'm using a pair of quality headphones (Sony MDRV55) so it's not an issue with the analog audio output either. I've also tried multiple other headphones and the result is the same.
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Jan 1, 2010
I have a partition that I want to put Debian on, and I'm using UNetbootIn, and whenever I try to use it, I can't make it install to my drive. The only option is for my C drive. Can you tell me another way to install Debian to my partition. Do I need to make the partition a logical drive?
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Aug 31, 2011
I am installing Debian for the very first time and having read websites similar to [url] I have come across parts of the installation which I do not understand.
For example, I have created logical volumes using the logical volume manager however am unclear what the message regarding writing changes to disk before configuring Logical Volume Manager means.
Once I have created the volume group, I am presented with a window that provides me with the ability to
Display configuration details
Create volume groups
Create logical volume
Delete logical volume
Extend volume group
Option 2 is pretty self-explanatory however am unsure whether it is advisable to segment directories between 2 or more volume groups. What benefits does it serve?
Option 5 provides me to extend a volume group however am unsure how this works?
Does it mean I can assign free space available one 1 physical drive to the existing volume group or does it mean I can assign free space available on a second phyical drive or does it mean both? How does it affect security, performance, etc?
Currently the only way I can see the logical volumes I have created by selection Option 4. Is there any other way? How do most people keep track of the logical volumes they have created e.g. checking off against a checklist, etc?
Next I have the ability to map the logical volumes to mount points however am confused what purpose the none mount point serves as I have the option to select it?
What are mount options for?
What do I use labels for?
What are reserved blocks for?
What does typical usage refer to?
How does the option to copy data from another partition work? What is it for?
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Apr 24, 2011
I want to setup a FAI server for which I was looking for the best method of mirroring the Debian Lenny. I want to setup a local mirror with the best method available for mirroring. If it is ftpsync, please provide me some best ways of doing it. I tried ftpsync mirroring but that was not getting properly working due to insufficient I want this mirror to be accessible in my FAI setup so that I can start the installation on multiple machines and start the updates and package installation to be done from the same local mirror.
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May 27, 2011
I installed Debian stable and I see these errors in the xsession error file
/etc/gdm3/Xsession: Beginning session setup...
GNOMEKEYRINGCONTROL=/tmp/keyring-j0E6Br
SSHAUTHSOCK=/tmp/keyring-j0E6Br/ssh
GNOMEKEYRINGCONTROL=/tmp/keyring-j0E6Br
[code]....
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Oct 4, 2010
Is it possible to partition an LVM in two volumes. So that one can be an ext4 filesystem and another can be swap.
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Aug 7, 2011
I was finally upgrading from F12 to F14, and as you'd expect from someone posting for the first time here, I did something stupid. My system has two drives set up as RAID-1 with LVM for the entirety of them. I added a new drive to use as the boot & OS drive, but during the install process I believe I somehow managed to wipe the LVM information from the RAIDed drives (though I did not install to them or format them).
While I have a working F14 install on the new drive, I would like to get access to the data I have on the RAID. However, the LVM tools show the RAID drives as uninitialized. If I try booting off the RAID, it gets partway through the bootup (the white part of the progress bar gets about halfway) before displaying "No root device found. Boot failed, sleeping forever." This occurs regardless of whether I have the new drive plugged in or not. I've been googling for the past several hours and haven't found anything that allows me to access the the volumes on the RAIDed drives.
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Jul 16, 2010
What is the difference between a Partition and a Volume in Redhat Linux 5?
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