CentOS 5 Server :: How To Automatically Resize Logical Volume
Feb 17, 2010
I'm sure many of you here have worked with disk quotas and lvm2 and my problem involves both. Basically what I'm wanting to do is have it so whenever a logical volume gets below a certain constraint (10Gb's) ie. it only has that much left - I want to automatically resize it to add 20 GB's. Obviously this can be done rather easily manually, and with a bit of python hacking it can be done programmatically but since this is for production use I was wondering if there was something a bit more fluid. Since this server is I/O intensive ZFS implemented via FUSE is not an option and neither is the still unstable BtrFS.
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May 17, 2010
Ok so I have one drive. /boot /lv_root and /lv_swap
At the end of the drive I have 32 gigs of free space still contained in the logical volume group. I want to remove it from the LVG but this is on one device. Supposedly there is a way to do this, pvresize and fdisk.
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Quote:
Originally Posted by source
#I've tried to shrink the PV with pvresize which didn't throw errors -
Good.
#but fdisk still shows me the same LVM partition size as before.
That's normal. pvresize "just" updates the PV header and VG metadata.
#So I guess the partition table has to be modified somehow?
Yes. That was mentioned in my reply: "Then shrink the partition in the partition table."
You can use fdisk or any other partition table editor for this. Some don't support resizing a partition. In that case, you can delete and create a smaller one. If doing the delete/create dance, you *must* create the new partition on the same cylinder boundary as the current one to preserve the current data.
Ive read from every source on LVM its not possible to do this. Why on earth would any Linux developer put LVM on a single drive system by default? Were they even paying attention? I dont mean to go off on a rant but if there are multiple drives LVM makes sense. However if you only have one large drive LVM holds your system hostage and you have to crawl thru the pit of hell to get it back.
I understand you have a choice in the matter when you install Fedora but its really the worst possible choice for default. Many newcomers to Linux run into this problem with LVM. If you cannot resize LVG's the software should have never been put into a Linux distro in the first place.
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Oct 17, 2009
I have a network (192.168.x.x) that I want to keep closed and private for the most part. I need however to get access to some files generated on the machines in this private network. So I first tried putting two cards in a machine running centos 5.2 and connecting one to the private newtork and the other to the public network. This worked somewhat but I was not able to see this bridging machine in the private network because I could not run 2 samba instances on this machine ( I need one for the public network). So I setup xen on a machine with the 2 NIC's and assigned one card to the host dom and the other to the guest dom which was connected to the private network.
This worked ok, but the only issue was the shared disk space. I couldn't use nfs because each machine operates in a different subnet and I don't know how to export a nfs drive across domains. So I created a logical volume on a disk and mounted this in both domains. This works some times,. but at other times I copy files from the private machine to the shared volume but i can't see them from the other domain. Also sometimes the guest domain which houses the private network server hangs during boot up saying that the logical volume has been assigned and cannot be mounted.
1) Is what I'm doing using logical volumes across domains legal (best practise, etc)
2) Is there another way for me to achieve what I want (sharing a disk partition across domains).
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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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May 7, 2011
I have a system with a 2TB RAID level 1 installed (2 x 2TB drives, configured as RAID1 through the BIOS). I installed Centos 5.5 and it runs fine. I now added another 2x2TB drives and configured them as RAID1 through the BIOS.
How do I add this new RAID volume to the existing logical volume?
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Jan 15, 2010
I'm wondering if there is a way to shrink an ext3 LV mount as / .I tried to with resize2fs ... but seems that isn't possible if the partition is mounted.
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Apr 8, 2010
I have a huge RAID6 array 21TB+ already partitioned in GPT. This is to be used as the storage location for my company's backup server, and I want to access it as one logical volume. Is this possible with Centos5? I just discovered the product specifications for Centos5, and saw that the maximum file system size is 16TB, but LVM2 should support volumes up to 1EB. Is there any way I can make this work in Centos, or am I going to have to run a different distro?
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Oct 16, 2009
I have a network (192.168.x.x) that I want to keep closed and private for the most part. I need however to get access to some files generated on the machines in this private network. So I first tried putting two cards in a machine running centos 5.2 and connecting one to the private newtork and the other to the public network. This worked somewhat but I was not able to see this bridging machine in the private network because I could not run 2 samba instances on this machine ( I need one for the public network). So I setup xen on a machine with the 2 NIC's and assigned one card to the host dom and the other to the guest dom which was connected to the private network.
This worked ok, but the only issue was the shared disk space. I couldn't use nfs because each machine operates in a different subnet and I don't know how to export a nfs drive across domains. So I created a logical volume on a disk and mounted this in both domains.
Here comes the question now. This works some times,. but at other times I copy files from the private machine to the shared volume but i can't see them from the other domain. Also sometimes the guest domain which houses the private network server hangs during boot up saying that the logical volume has been assigned and cannot be mounted.
1) Is what I'm doing using logical volumes across domains legal (best practise, etc)
2) Is there another way for me to achieve what I want (sharing a disk partition across domains).
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Jun 1, 2011
I ran yum update on my centos 5.6 box a couple of days ago and following this the system would not reboot, dont recall the exact error and don't seem to be able to find it logged anywhere but it was something to do with LVM not being able to find a disk.
In the end I have booted to linux rescue and edited my /etc/fstab file so the system does not try to mount the offending volume group. This enables the system to boot but I need to find out what is wrong with the system and get this volume group accessible again. Here is my edited fstab showing the commented out line. code...
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Jun 5, 2009
I've added a new LUN to my Centos 5.2 server using Powerpath and have added it to an ext3 logical volume. I extended the logical volume using lvextend and the new space shows up correctly in lvdisplay. What I'm having problems with is getting Centos to see the new disk space (df -h shows 500GB, not 600GB as expected). I've tried running a resize2fs on the new volume but it tells me that "the filesystem is already n blocks long. Nothing to do". Does any one know where I'm going wrong? If possible I'd like to sort this without a reboot.
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Jun 22, 2009
I made a mistake with lvm2 on centos 5.2.
I used parted to create a partition inside the logical volume, and then merrily used that partition, which appeared as /dev/pv-whatever/lv-whateverp1
Of course I created the FS as ext3.
So, after a reboot, I can't access anything in that logical volume with standard tools, as /dev/pv-whatever now only has the lv-whatever special file inside.
I can look inside the LV with parted fine, but parted can't copy ext3 filesystems.
Is there any way to get the data out of a partition created INSIDE a logical volume if that filesystem is ext3?
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Jun 14, 2010
I just read and learned about logical volume management today. I have a server running RHEL5.4, LVM2. I have 1 physical volume, with one volume group, and 3 logical volumes. I have no free extents, nor do I have any in my volume group (not sure if it's possible to have free in one and not the other anyway), and I am running out of space on one of my logical volumes. Doing a df -h shows 96% of 9.7GB used on /dev/mapper/MainVG-root, mounted at /. So here's the stupid question: how can I find out what directories/files are taking up what space within this logical volume? As I said I have 3 all together, and the other 2 are mapped to /var and a /var pgsql sub-directory. I figured I could get the sizes of the other directories under / and drill down accordingly, but I seem to be missing some basic rule because the commands I am using and the values I am getting don't add up.
For example, it seemed logical to me to do an ls -lsh on / to try and identify the largest directories. Each directory is listed as being ~4-8K in size. That doesn't make sense to me. So I decided to do a du -sh on each directory. Having done this on all of the / sub-directories and added up those values, there is not enough reported usage here to equal 8.9GB of used space (as df -h / reports).how they would find out how the 9.7GB here is being allocated? Preferably without scripts as I am not ready to add a layer of complexity to this yet without understanding some fundamentals.
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Aug 3, 2009
I have a CentOS 5 server with a 250gb hard drive running close to the maximum space on one of the partitions. 87% of 200gb (/home), roughly. I have a second 250gb hard drive which is completely unused. I just recently did some searching through the forums here and found out about LVM and wanted to implement it. Although the downside is I believe it has to wipe a drive/partition before it can add it as a logical volume.
The process I'm considering following is:
1. add this empty 250gb (SDB) secondary hard drive as a logical volume on LVM and copy everything over from the currently filling up partition on my main hard drive.
2. have LVM add in the old partition on the primary hard drive (SDA)
3. extend my logical volume out to include the old partition. Extending my total hard drive space out to 450gb.
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Jul 5, 2011
I have a 7.9 TB logical volume I've created from 8 1 TB RAID 0 devices. The volume is formatted with XFS so I can resize when ready. However, I think I want to do something that is not possible. I have 2.5 TB free on my logical volume. I'd like to shrink the volume down to be 6 TB by getting rid of 2 of the 1 TB devices in the physical volume. However pvmove seems to require free extents in order to work. Do I need to add 6 TB of storage, pvmove everything onto it, and then decommission the original 8 1 TB physical devices from the volume?
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Oct 4, 2009
Is it possible to stretch the logical volume "/home" over to a second hard drive using LVM? Would this have to be done during the Debian installation or could it be done after the installation is finished? Should I just make a 2nd /home partition?
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Apr 26, 2010
How to create multiple Logical Groups out of a single Physical Volume? Here is the Physical Volume I have created:
Code:
# pvdisplay
--- Physical volume ---
PV Name /dev/sda9
VG Name myVG1
PV Size 54.88 MB / not usable 2.88 MB
Allocatable yes
PE Size (KByte) 4096
Total PE 13
Free PE 11
Allocated PE 2
PV UUID bon4Ao-vmgC-aP1h-EC9X-w3tN-YXNu-0N2dAw
This is how I am creating a Logical Group out of the above Physical Volume:
Code:
# vgcreate myVG1 -s 4m /dev/sda9
Display:
Code:
# vgdisplay
--- Volume group ---
VG Name myVG1
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size 52.00 MB
PE Size 4.00 MB
Total PE 13
Alloc PE / Size 2 / 8.00 MB
Free PE / Size 11 / 44.00 MB
VG UUID O6ljYC-bflz-EUTd-nf34-8gYe-Fh39-Bh3cOg
But I am unable to create one more Logical Group out of this Physical Volume. Can we accomplish it? Or do we always extend our current Logical Group to utilize the available space of a Physical Volume?
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Sep 4, 2009
I've just started playing with virtualization and I started my first VM. I would like to know if it's possible for the host machine to mount the partitions of the VM when it's closed. Right now the VM uses /dev/vg0/vm1 and has 3 partitions on it. I tried mount /dev/vg0/vm1 ~/vm1 at first before I remembered that I'd need a way to mount a specific partition inside the logical volume, not the volume itself!
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Jul 21, 2010
Could anyone give the steps for converting a logical volume to a raw disk to mount Oracle ASM Instance on it?
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Dec 1, 2010
I'm rearranging a bunch of disks on my server at home and I find myself in the position of wanting to move a bunch of LVM logical volumes to another volume group. Is there a simple way to do this? I saw mention of a cplv command but this seems to be either old or not something that was ever available for linux.
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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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May 23, 2011
I'm using Fedora 14 x86_64.I want to take 200GB from the /home Extended-Logical Partition, and install Archlinux on it, how do I do that? In this 200GB Free Extended Space I want to create another 4 Logical Partitions for Archlinux.
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May 23, 2011
I'm using Fedora 14 x86_64
I have the following partition table code....
I want to take 200GB from the /home Extended-Logical Partition, and install Archlinux on it, how do I do that?
Note: In this 200GB Free Extended Space I want to create another 4 Logical Partitions for Archlinux.
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Jan 1, 2010
so i have f12 installed on my hd with lvm using the whole extent of the HD , i want to reduce it so i can dual boot it with a windows system, i managed to reduce the logical volume to free some space, but i cant seem to reduce the physical volume, is this possible and how ?
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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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Aug 4, 2010
What is a logical volume? Why should we have them? Is there no need for grub on such a system? All kinds of problems since I tried to install Slackware!
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Jul 13, 2010
I have cluster of 3 logical volumes making a filesystem, is there a tool or command out there that could tell me in which logical volume a file is?
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Apr 7, 2010
I have a Fedora 8 system that uses LVM on one of it's drives (/dev/sdb2). One of the logical volumes is getting full (LogVol02). There is an unused, unmounted logical volume (LogVol03) available. I can see two possible options.
1) Mount the unused logical volume (LogVol03) on a new mount point (/home2) and create more space there
2) Delete the LogVol03 logical volume and extend the nearly full volume (LogVol02) into the now available space.
Option 2 seems like the better approach, since it will seem seamless to the system users. I'm looking for suggestions on how I should go about doing this and what I need to look out for. Is it better to use the command line tools (lvm ...) or the GUI (system-config-lvm) to do this?
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Nov 13, 2009
My computer: (Lenovo T61 Thinkpad, running fc11 for about 2 and half months). Apparently I when I made my partitions I didn't leave quite enough room in my root directory, because I just completely ran out. Here is how my hard drive is partitioned:
1 physical volume group (sda)
4 logical volumes (home, root, swap, var)
The root had about 15 gigs on it, which just filled up. When I restarted to see if that would help, when it rebooted it went fine up to the log-in screen. Instead of the usual fedora blue background, it was black except for the log-in window, which looked very low-res. A little pop-up kept coming up saying the GNOME power configuration settings failed to load or something. When I logged in, the whole screen was black except for the mouse, and I could get no response. I have plenty of space left in home, so I rebooted to rescue mode using the first fedora installation disk, and tried the following command:
Code:
lvreduce -L90G /dev/mapper/DRIVE
which only returned:
Code:
lvreduce: relocation error: lvreduce: symbol dm_tree_node_size_changed, version Base not defined in file libdevmapper.so.1.02
So I couldn't reduce the size of home, and thus couldn't increase the size of root.
IN SUMMARY:
a) the lack of memory in root the probable cause for my computer not working
b) there a good way to reduce home and increase root while running this live disk
Note: When I am looking at it now in the logical volume manager, it says that on the whole physical volume there is only 400MB free. However, when I last looked (about 30 mins before I started having problems) it said there were about 100 Gb free.
Edit: Nevermind. I did some more research and it turned out to be more of a gnome power manager thing rather than a memory space thing, although I'm certainly going to increase my root memory now.
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Jul 22, 2011
I've got a big problem. Earlier this afternoon I tried to unlock my screen, but the password dialog didn't appear (the background did, and I could move the pointer, but no dialog). So I restarted the computer, only for the Fedora bootup icon to get about 3/4 of the way full before the screen blanked out and I got the message "Boot has failed. Sleeping forever." I booted into the liveCD and opened the system installer to see if maybe I could just reinstall the system in place while leaving my data intact. When I got to the partitioning stage, my old partition layout was there...except one LVM volume group was totally missing. And this is the volume group that contained my / and /home, among other things. Another volume group sitting on a different RAID was still there, but ironically it was the one for short-term data.
I have three hard drives, using soft RAID and LVM. Each drive is split into 4 partitions. The first partition of each is part of a RAID-1 where /boot sits. The second of each makes up a RAID-5 on which sits my "Main" volume group for my important data (this is the one that has gone AWOL). The third of each makes up a RAID-0 on which my "Volatile" volume group sits (for /tmp, /var/tmp, and the like). The fourth is swap.
Is there any chance I can restore my volume group so my data can be recovered? I'm not sure if I've got the full layout with volume sizes written down anywhere.
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Jul 30, 2010
I have 3 harddisks, 1 for system and 2 for data.
To manage it more easy, I tied 2 harddisk in LVM. And I made an logical volume. It used ext4 for it's filesystem.
Today, I wanted to format and reinstall the system. So I booted the system using Ubuntu CD. But managing the partition, I accidently delete the logical volume. Because backup(/etc/lvm) was in itself, I couldn't restore the old config. I just create new logical volume.
As I expected, I couldn't mount it correctly. Mount said that "Mount: Mouting failed A on B! Invalid argument!"
I must recover it, because it has a lot of import data. What should I do?
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