Attempting to resize my root partition on LVM

My root partition is currently full, so I want to resize it. I'm using LVM and the filesystem is ext4, so I assumed it should be easy enough. My plan was to reduce my /home to make space. However, when following the instructions in the wiki get the following error:
# resize2fs /dev/vg/syshome 450G
resize2fs 1.42.4 (12-June-2012)
Filesystem at /dev/vg/syshome is mounted on /home; on-line resizing required
resize2fs: On-line shrinking not supported
According to https://ext4.wiki.kernel.org/index.php/ … esystem.3F however, online resizing should be possible.
What am I missing?
Last edited by phunni (2012-08-03 20:37:26)

First, install and use ncdu to check what's eating up all the space.
$ ncdu / --exclude /home --exclude /media
Maybe it's easily fixed, like a log file or something. Speaking of which, learn2logrotate. Here's my /etc/logrotate.conf.
Then if you still want to grow the root partition, try this: https://wiki.archlinux.org/index.php/LV … cal_volume
Next time please specify in the title that it's about LVM.

Similar Messages

Can't get lvm/luks to boot - cannot find root partition

Hi,
I'm trying to get a dm-crypt on top of lvm to boot but without success so far. I followed http://wiki.archlinux.org/index.php/Sys … r_dm-crypt and http://wiki.archlinux.org/index.php/Ins … AID_or_LVM, everything works fine (I can mount the partition) but when I try to boot from it, it cannot find the crypted partition and fails.
USELVM="yes"
HOOKS="base udev usb usbinput lvm2 encrypt filesystems"
root=/dev/mapper/sda2 cryptdevice=/dev/sda2:root2-lvol0 ro
jan@jan ~/src/xf86-video-ati $ ll /dev/mapper/
insgesamt 0
crw-rw---- 1 root root 10, 62 21. Feb 2008 control
brw------- 1 root disk 254, 0 21. Feb 2008 root
brw------- 1 root disk 254, 1 21. Feb 2008 root2-lvol0
brw------- 1 root disk 254, 2 21. Feb 2008 sda2
/dev/mapper/root is my current encrypted / without lvm
The boot process successfully identifies the lvm /dev/mapper/root2-lvol0 and continues with hook 'encrypt' but doesn't ask me for a passphrase but goes on to hook 'filesystems' and fails then because it can't mount the correct root-partition obviously.
There's only /dev/mapper/root2-lvol0 and /dev/mapper/control when I'm in the rescue sh from initrd.
Anyone got that combination to work?
- Jan

Reboot, at the sound of the chime (not before) depress the option key, when the startup manager appears choose OSX.

Cannot resize root partition

i used gparted live in order to maximize the size of root partition but i can't
Device Boot Start End Blocks Id System
/dev/sda1 2048 718847 358400 7 HPFS/NTFS/exFAT
/dev/sda2 * 718848 586656347 292968750 7 HPFS/NTFS/exFAT
/dev/sda3 612048894 976771071 182361089 5 Extended
/dev/sda4 586657792 612046847 12694528 83 Linux
/dev/sda5 967215104 976771071 4777984 82 Linux swap / Solaris
/dev/sda6 612048896 967213055 177582080 83 Linux
Number Start End Size Type File system Flags
1 1049kB 368MB 367MB primary ntfs
2 368MB 300GB 300GB primary ntfs boot
4 300GB 313GB 13.0GB primary ext4
3 313GB 500GB 187GB extended
6 313GB 495GB 182GB logical ext4
5 495GB 500GB 4893MB logical linux-swap(v1)
i minimize the size of sda6(home folder) in order to give more space to my root partition sda4 but i can't .gparted don't give the option to add the unallocated space to sda4.when i tried to adjust the partitions the swap partition was off
Last edited by kosgeter (2014-04-30 21:52:13)

That's a no-no, you can't do that
To increase the size of sda4, there must be continuous free space after it.
In your case it's like
sda4
sda5
sda6
You first reduce sda6 and you get free space after it, you need to move sda6(not just resize it). Also you will need to delete sda5(which is your swap) and remake it.
Example:
sda4 - 10GB
sda5 - 4GB
sda6 - 100GB
delete sda5 and resize sda6:
sda4 - 10GB
4GB free space
sda6 - 50GB
50GB free space
move sda6:
sda4 - 10GB
50GB free space
sda6 - 50 GB
4GB free space
resize sda4 and create swap(sda7):
sda4 - 60GB
sda6 - 50 GB
sda7 - 4GB
Might I suggest that you use console tools instead of gparted(imho gparted is buggy). The tools in the arch install iso should do fine. Also you can't resize mounted partitions, so you shouldn't try to touch your arch root partition while using it
Last edited by rand_x0r (2014-05-01 16:06:31)

Resized root partition didn't really resize

I had two partitions, 250 + 50 gigs. Then I decided to remove the second one and grow the root partition over the whole disk.
So I started using install DVD -> disk utility -> removed the second and grew the first. Everything went OK.
Then I rebooted and it there was no more empty space on the drive. So I strted disk utility (live system) and the numbers were funny, I'm talking about partition (not drive!):
used space: 200gigs, free space: 50 gigs, total capacity: 300 gigs.
So the partition got resized but the volume actually didn't?
Then I ran (live) verify disk and it found "minor error in volume header" (no **** sherlock, you're missing 50 gigs) but couldn't fix it. I restarted from DVD, ran disk utility there and there were no errors found!
So, how can I grow the root filesystem? How come can "real" system find errors and live doesn't?

I fixed it!
I did what the graphical interface should call in the background, but it seems it just didn't.
Ran the system from DVD, opened terminal and wrote
diskutil resizeVolume /dev/disk0s2 SIZE
it's now ok.
The funny part is that SIZE parameter was exactly the same as
diskutil resizeVolume /dev/disk0s2 limits
returned under "Current size".
It seems there's a bug in diskutil.

LVM + LUKS + TRIM @ root partition

Hi.
I'm installing a fresh arch linux PC right now with LVM + LUKS and TRIM because i have one SSD , and UEFI mobo.
SSD has a physical partition for the /boot and the rest one used with LVM where a virtual group created called "lvmRootPool" which contains two logical volumes ("lvmRootPool-root" and "lvmRootPool-swap")
The lvmRootPool-swap was kept for swap and
the lvmRootPool-root for /.
Here comes the question. I want to enable TRIM for that disk (i know the security risk) and following this guide i have to add a specific line with discard keyword in /mnt/etc/crypttab (i'm before chroot). But when i open the /mnt/etc/crypttab it has a note saying
Do not list your root partition here, it must be set up beforehand by the initramfs (/etc/mkinitcpio.conf)
So what i supposed to do ? Should i add that line at crypttab file or not ?
lvmRootPool-root /dev/sda2 none luks,discard
Also , is it possible to use TRIM for swap ? I think that isn't but maybe something have been changed that i don't know.
Thank you.
Last edited by netpumber (2015-05-24 18:06:40)

maybe your missing pieces are: https://wiki.archlinux.org/index.php/So … IM_for_LVM and https://wiki.archlinux.org/index.php/Dm … encryption
In a nutshell:
For encryption you need to change the kernel parameter in your bootloader, add encryption and resume hook to mkinitcpio.conf. If the hooks are at the right spots, it just works for swap as well.
For LVM passthru there is a setting described in the link above
You still need the discard flags in your fstab.

Resize root partition within a PVM

Hello - I have found any information about this searching the forum, but I am trying to re-size the root partition that comes with one of the PVM templates (some of them are really small). In order to do this, you need to boot into an ISO.
With a PVM, you cannot boot directly to an ISO...you have to network boot from an NFS share using the contents of the ISO. Same way you would deploy a PVM from ISO.
My problem comes in when I need to get into "linux rescue" mode at the grub prompt when you first boot to the ISO normally. This prompt does not seem to come up when network booting to the ISO. Does anyone know the proper steps to do this?

I think I figured this out. I had to...
- Delete the swap partition (because it's the last one by default with the template, xvdb3).
- Delete the root partition (xvdb2).
- Re-create root partition with same starting block and partition number (but reserve space for swap, I left 2gb).
- Re-create swap partition with remaining space, and assign swap type of 82.
- Reboot, and run resize2fs on root partitions (I'm currently at this stage but it looks like this will work fine).
- Shutdown the VM, detaching the disk that was resized, and attached it back to original VM. Then start the VM.
- mkswap /dev/xvda3 (on swap partition)
- swapon /dev/xvda3
- free -m (to view new swap space)
Edited by: ekrengel on Mar 13, 2012 10:39 AM
Update steps...

[CLOSED + MOVED]Activate lvm2 on ext3 root partition

Hello guys,
I want to move to lvm2 on my arch installation, I haven't used any lvm before. So here's what I did so far:
1. shrink root partition using gparted to 7 gigabytes
2. created an lvm partition with size 8 gigabytes
3. migrated all files from the root partition to the lvm partition (in single user mode: # rsync -axSX / /newpartition)
4. added lvm2 hook before the filesystems hook in /etc/mkinitcpio.conf according to http://wiki.archlinux.org/index.php/Con … #Using_lvm
5. regenerated the initramfs image using # sudo mkinitcpio -g /boot/kernel26.img
5a. added a grub entry with root=/dev/vg/root (I have no idea what the difference is between that and /dev/mapper/vg-root)
5b. edited /etc/fstab to use /dev/vg/root (again, no idea if /dev/mapper/vg-root would have been more appropriate) as root mountpoint "/"
6. Rebooted
7. Unfortunately, I cannot copy-paste the output, but upon reboot, the initramfs loads fine, it seems to recognize to lvm2 volume, but then says "trying to open console - not found" or something like that and then kernel panics on me.
Any ideas?
thanks!
CLOSED+MOVED:Moving this question elsewhere, as this topic seems too advanced for this subgroup.
Last edited by awayand (2010-01-13 12:44:11)

I used reiserfs for many years, many partitions, many distros and had no problems. Every now and then I'd use ext3 but there were a few issues. I got a new laptop in January and decided to take the plunge: shrunk vista, small ext2 /boot and the rest set up as an encrypted partition with LVM2, all logical volumes set up as ext4 (except swap!). I've been very impressed with ext4 stability.
Oh, and step (5) edit fstab to reflect the new file systems, make sure /etc/mtab doesn't exist.

[solved] unable to boot to the root partition on my new (usb) HDD

hello,
i got a "unable to determine major/minor number of root device" error message when the system try to find the root partition (after it succefully boot on the boot partition).
Shuttle XPC SB65G2 (Mainboard FB65), usb HDD: Intenso INIC-1608L, Linux ctkarch 2.6.37-ARCH #1 SMP PREEMPT, grub legacy.
sdb1: /boot (ext2), sdb2: swap, sdb3: / (ext4), sdb4: /home (ext4)
of course i have a kernel compiled with usb in HOOKS in mkinitcpio.conf.
i tried to install with sdb1: / (ext4), sdb2: swap, sdb3: /home (ext4)
but i got another error: it can't find the file /dev/blabla (root partition) (after it succefully boot on the partition!).
at last i found the solution: i have to comment "root (hdx,x)" in menu.lst for grub legacy!:
# (0) Arch Linux
title Arch Linux
# root (hd1,0)
kernel ... by-uuid...
you don't need this line when you define by uuid, by label, or so...
it seems this line perturbs the behavior of the system.
if this can help...

You do not need the "raw". If you do:
ok devalias
it will show you how other aliases are formed
do ls -l /dev/dsk/c0t2d0s0 and you'll see the "non-raw" device path
ok reset
will "lock" your alias in NVRAM but it will attempt to boot from boot-device (normally disk) the next time unless auto-boot? is set to false
ok setenv auto-boot? false
My guess is that it could not understand "raw", reset, and booted from boot-device.
You can:
ok setenv auto-boot? false
ok nvunalias altboot
ok nvalias altboot /pci@1f,0/ide@d/dad@2,0
ok reset
ok boot altboot

Trouble with luks non root partition

hello,
today i struggled with creating an encryptet archlinux installation.
what i want is to encrypt my root and all other partitions with luks.
basically i used the guide on the archwiki ( https://wiki.archlinux.org/index.php/Dm-crypt_with_LUKS ),
but iam always failing at the same point.
my setup is a bit more complex, but to describe my problem i want to use a simple testcase
/dev/sda with 2 partitions
/dev/sda1 as /boot
/dev/sda2 as crypto_LUKS
/dev/sdb with 1 partition
/dev/sdb1 as crypto_LUKS
/dev/sda2 should be / and /dev/sdb1 f.eks. /home
iam using passphrases for both partitions.
i edited the HOOKS line in mkinitcpio.conf and added "encrypt" before "filesystems",
and i also edited the crypttab to somethink like this:
sdb1_crypt /dev/sdb1 none luks
my fstab entry for /home looks like
/dev/mapper/sdb1_crypt /home ext4 rw,relatime,data=ordered 0 1
so far so good, when iam booting iam prompted for passphrases 2 times. first time to encrypt and mount the root-partition, which works fine.
second time for the /home partition, but then the boot process stucks and systemd times out
[ OK ] Found device /dev/mapper/sdb1_crypt
[ OK ] Started Cryptography Setup for sdb1_crypt
[ OK ] Reached target Encryptet Volumes
[ TIME ] Timed out waiting for device dev-mapper/sdb1_crypt
[ DEPEND ] Dependency failed for /home
[ DEPEND ] Dependency failed for Local File Systems
iam thrown to emergency shell then.
/dev/mapper/sdb1_crypt exists, but when iam trying to mount it with
mount /dev/mapper/sdb1_crypt /mnt
it says
mount: special device /dev/mapper/sdb1_crypt does not exist
cryptsetyp says , that /dev/mapper/sdb1_crypt is inactive.
anyway i can luksOpen it manually with
cryptsetup luksOpen /dev/sdb1 foo
enter passphrase again and now iam able to mount /dev/mapper/foo
what am i missing in my here?
thanks for helping !
ineb

I just worte this. It dose not cover the LVM part. However, you do not need to do anything for that.
Just add this between "keymap encrypt" and "filesystems" in the HOOKS= array
lvm2
Also, becuase you have more then mone parition that is encrypted and needs to be decrypted at boot, you may need to have this the the /etc/default/grub instead of what what I put in the post I linked to.
GRUB_CMDLINE_LINUX="cryptdevice=/dev/sda2:root cryptdevice=/dev/sdb1:home"
The `grub-mkconfig -o /boot/grub/grub.cfg` command WILL find all your LVM2 lv's with no problem and configure grub.cfg correctly. You just need to edit /etc/default/grub and use that command to rebuild the grub.cfg
Other then that this post should solve your problems.
https://bbs.archlinux.org/viewtopic.php … 2#p1209702
Last edited by hunterthomson (2012-12-25 02:40:23)

[PPC] new install fails to boot: root partition not found

Hi,
new ArchPPC installation on a iMac G3. It does not boot further than initramfs because root partition is not found. I get something like:
Root device /dev/sda4 doesn't exist
Attempting to created it
ERROR: unable to determine major/minor number of root device /dev/sda4
then I get a dropbox recovery console but keyboard doesn't work.
I chroot in the installed system to change mkinicpio pata hook to ide, regenerated initramfs but that didn't help.
Any guidance to diagnose and solve this issue would be greatly appreciated.

Hi, sorry I just realized you replied to my thread.
I don't have my mac at the moment, but I must have done something like :
- boot the live CD
- get the output of lsmod
- copy this output to mkinitcpio.conf (the one that's on your HD), remove the autodetect hook
- chroot into your HD setup
- regenerate initramfs
- update yaboot (is this really mandatory?)
- exit chroot and reboot.

Extending root partition

Hi
We have installed an Oracle VM server. We have 3 VM 's in it. In one of the machine we have installed two database.
The root partition is 5gb. which is now 99% full.
My question is, how can I extend the root partition.
this is result of df-h command:
Filesystem Size Used Avail Use% Mounted on
/dev/xvda2 3.0G 2.9G 1.3M 100% /
/dev/xvda1 92M 37M 50M 43% /boot
tmpfs 5.4G 7.7M 5.4G 1% /dev/shm
/dev/xvdb1 237G 201G 24G 90% /u01
/dev/xvdd 296G 229G 53G 82% /u03
Appreciate your help
Thanks
Edited by: dba88 on 5 Jun, 2013 6:50 PM

Hi,
I have a littel experience with XEN, but when i think like a Linux administrator it is not possible to extend the disk xvda directly because the full size of disk xvda is used and you are not using the LVM concept.
i advice you to create a new partion in the disk xvdb (xvdb2) and move your home directory to this partition (you can add the mount in the fstab file).
I hope this can help you
Best Regards

XFS Root Filesystem on LVM Stripe - Corruption

I want to create a LVM Stripe across two SATA drives. The problem I keep running into is, on boot, arch reports that a fsck needs to be run on the root filesystem, so it mounts it read only and allows me to type in the root password to get shell access. This all happens after I do the initial arch install, reboot, log in normally, do a pacman -Syu, reboot.
Here's what I have and what I did...
I have two 320G SATA Drives plugged into my system board (an ABIT AN-M2HD). My Bios is set to "AHCI Linux" for the SATA mode.
Boot the latest Arch CD install at command prompt:
cfdisk /dev/sda
create 125M Partition (for /boot) /dev/sda1
create 319G Partition /dev/sda2
cfdisk /dev/sdb
create 320G Partition /dev/sdb1
lvm pvcreate /dev/sda2 /dev/sdb1
lvm vgcreate lvmgrp0 /dev/sda2 /dev/sdb1
lvm lvcreate -i2 -I4 -L1G -nswap lvmgrp0
lvm lvcreate -i2 -I4 -L594G -nroot lvmgrp0
/arch/setup (I'm going to abbreviate this)
Hard Drive Setup (chose option 3)
Set swap to swap LV
Set root to root LV (xfs)
Set /dev/sda1 to /boot (ext3)
/etc/rc.conf USE LVM="YES"
Kerel Params = Boot from LVM Support? I answer Yes
Grub Looks Good.
Everything seemingly installs fine, I can reboot and arch comes right up. But after I do pacman -Syu everything goes to pot.
I suspect I have something wrong in alignment between the LVM stripe and XFS, but dont know..
alternately, should I set my LVM Stripe Size to a value larger than 4? I thought since on i686 max XFS block size is 4096 (4K) then they should match. Any thoughts on this?
help! ;-)
Ether..

I just wanted to add an update. It wasn't a LVM issue, it was a XFS issue.
I went to Arch 64 bit for a while and everything (above) worked just fine.. The usability and Lib32 issues with 64 bit lost it's luster and last weekend I went back to 32 bit Arch.
In going back to 32 bit I followed my procedure above for partitioning just as I had with the 64 bit version and after rebooting from the install and updating packman, the same thing occurred, the file system would start to corrupt, pacman would complain that libraries were truncated and so forth. After reboot, the /root partition would not mount read/write because it was not clean...
I reinstalled Arch 32 bit 6 times on Saturday trying various things in a scientific way and came to this conclusion:
__and I have no idea why__, but when I use the XFS file system on an install with Arch 32 bit, it hoses up. "Your Crazy" you might say, but trust me I've tried it different ways more than a dozen times. (I'm no n00b either, I've been an RHCE since 2003 and a daily Linux user since 1999.) Seems crazy, but XFS was a constant in all of my testing. The only thing I can figure is that it's my hardware and that's just a guess. 64 bit worked without a hitch with XFS. I even got desperate and installed / on a lone 60 gig partition (/dev/sda1) completely deleting all LVMs and it still corrupted with XFS and 32 bit
The Solution?
I used JFS. I have created the LVM Stripe as I have described above and it works great. No issues.
Weird..
For the sake of knowledge I have a:
AMD 5000+ Black Edition CPU
Abit AN-M2HD Motherboard
2 Gig Dual Channel RAM (2x1Gb)
2 320 Gig SATA Drive
1 SATA DVD Writer
-Ether..
Last edited by EtherNut (2008-01-29 14:54:01)

Is it possible to resize Solaris (8) partition and move it?

Hi,
I have a multiboot machine (w2k, RH9, Solaris8), on which solaris partition has some extra space. I need to resize Solaris (shrink it) and also move its location on the disk so that I can use the extra space by expanding the linux root partition.
Is this possible without a solaris reinstall? I don't have the CD's and reinstalling is not an option.
Can this be done using some of the partition tool and disk editors?
Any pointers will be appriciated!

I haven't seen any Partition Manager for Solaris x86, specially for Solaris 10 which has changed its partition number because it used to be equal to Linux Swap File, I've tryied Partition Manager, Partition Magic and none seems to works, if somebody knows about a partition manager that detects Solaris partition let us know

Smallest possible root partition?

I'm trying to remotely (SSH) convert a machine from Ubuntu Server to Arch Linux.
The owner of the machine does not have any external storage available (e.g., flash drives) - he switched over to using Apple products almost exclusively and has been using cloud services and such to store everything.
The machine's partition table currently looks like:
# fdisk -l
Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000af6e3
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 499711 248832 83 Linux
/dev/sda2 501758 625141759 312320001 5 Extended
/dev/sda3 625141760 625142447 344 83 Linux
/dev/sda5 501760 625141759 312320000 8e Linux LVM
Disk /dev/mapper/Pauls--Ubuntu--Server-root: 317.8 GB, 317785636864 bytes
255 heads, 63 sectors/track, 38635 cylinders, total 620675072 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/Pauls--Ubuntu--Server-root doesn't contain a valid partition table
Disk /dev/mapper/Pauls--Ubuntu--Server-swap_1: 2009 MB, 2009071616 bytes
255 heads, 63 sectors/track, 244 cylinders, total 3923968 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/Pauls--Ubuntu--Server-swap_1 doesn't contain a valid partition table
# parted /dev/sda print
sda sda1 sda2 sda3 sda5
james@Pauls-Ubuntu-Server:~$ sudo parted /dev/sda print
Model: ATA WDC WD3200AAJS-0 (scsi)
Disk /dev/sda: 320GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 1049kB 256MB 255MB primary ext2 boot
2 257MB 320GB 320GB extended
5 257MB 320GB 320GB logical lvm
3 320GB 320GB 352kB primary ext4
Would it be possible, via a creative combination of fstab and symlinks, to have a root partition of ~200 MB? What issues might arise?

Depends on what you have on it. If /var, /home, /usr, /boot, /etc, and /opt are on on their own partitions, you could probably get away with a root that was just a few MB. Each of those that is on the root partition will add to the requirements, generally /etc doesn't take too much, /boot can, depending on how many kernels you have, and /opt depends completely on whether you use any programs that get installed there; I have none. /srv is something else to consider if you run apache or something.
Of course, putting /usr and /var on their own partitions creates some other challenges, and those will be two of your larger dirs.
Last edited by Scimmia (2013-12-05 18:27:51)

Gnome-system-monitor mislabels root partition

Since the recent Gnome 2.30.2 upgrades the other day, Gnome System Monitor has oddly started mislabeling my root partition in the "file systems" tab. Every other partition is labeled as "/dev/sda2," "/dev/sda5," etc. But my root partition is labeled "/dev/disk/by-uuid/42d32269-85ca-4567-a3ha-71hj8e0f7838." So the mode of labeling is not consistent, using one type of label for every partition and another type just for my root partition.
The problem with this is that the columns are automatically resized to fit the entire length of the uuid label, pushing information I want to see off screen and forcing me to scroll over to see it or resize the window or or resize the column every time, etc..
I see that the gnome-system-monitor package is still at 2.28.1, so it wasn't upgraded. What could cause this? It's an annoying bug and was not a problem before I did the 2.30.2 upgrades yesterday. I also notice that the Gnome Disk Utility and Gparted do not do this; they label my root partition /dev/sda1.
Last edited by cb474 (2010-06-24 05:09:31)

gnome-system-monitor uses libgnomesu for this. It's a library that does the same things as sudo does.

Attempting to resize my root partition on LVM

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