single user mode

[faa_70]

Hey,
I'm trying to extend the /usr volume on my mythbox...so once i log into single user mode, i try and umount /usr...but it keeps telling me it's busy...so i do a lsof | grep /usr to see what's running and i have a few processes running...can anyone tell me how to boot into single user mode so i can umount /usr

Thanks

[Seve]

Hello:
I haven't done it in quite a while, however, what I used to do [if my memory isn't failing me] was edit my kernel boot line in grub and add the Number 1

your kernel boot line should look like this

...... 1 rhgb quiet

Seve

[faa_70]

thanks...but that works getting me to single user mode...but if i try to umount /usr i still get /usr device is busy...so then i do a
lsof | grep /usr

and this is what i get

/usr/lib/locale/locale-archive
/usr/lib64/gconv/gconv-modules.cache
/usr/sbin/lsof
/usr/lib/locale/locale-archive
/usr/lib/locale/locale-archive
/usr/lib64/gconv/gconv-modules.cache
/usr/lib/locale/locale-archive
/usr/sbin/lsof
/usr/lib/locale/locale-archive

so how do i stop these processes???

[sideways]

How is /usr mounted? Is it in an lvm? You don't need to umount ext3 partitions to expand them, see 'man resize2fs'

[faa_70]

well it's a logical volume...do it's /dev/VG00/usrLV that i'm trying to expand...and if do a resize2fs /dev/VG00/usrLV it tells me /dev/VG00/usrLV is a mounted filesystem and i can't expand it...

so then i do a umount /dev/VG00/usrLV and it tells me mount: /usr: device is busy

[sideways]

You need to use lvextend first to extend the logical volume, see this howto which shows you how to do if for the whole of '/' without unmounting. You may not need to create a new pv if you have space in the volume group.

http://forums.fedoraforum.org/forum/...d.php?t=154625

[faa_70]

doesn't work...i did the lvextend but when i do a resize2fs it tells me i can't do it...

could it be that resize2fs is too old?? i don't have the current one installed...it's like version 1.38

[sideways]

can you post the output of mount, vgdisplay and lvdisplay.

Also what is the exact error from resize2fs and can you post the exact command line you are using.

If it's not an etx3 partition and you have to umount then you can still do it from a livecd session,

[faa_70]

okay...the exact command and error are:

# resize2fs /dev/VG00/usrLV
resize2fs 1.38 (30-Jun-2005)
/dev/VG00/usrLV is mounted: can't resize a mounted filesystem!


mount:
/dev/md0 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/mapper/VG00-homeLV on /home type ext3 (rw)
/dev/mapper/VG01-videoLV on /myth/video type ext3 (rw)
/dev/mapper/VG01-movieLV on /myth/movie type ext3 (rw)
/dev/mapper/VG01-musicLV on /myth/music type ext3 (rw)
/dev/mapper/VG00-usrLV on /usr type ext3 (rw)
/dev/mapper/VG00-varLV on /var type ext3 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)

vgdisplay:
--- Volume group ---
VG Name VG01
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 13
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 465.75 GB
PE Size 32.00 MB
Total PE 14904
Alloc PE / Size 12480 / 390.00 GB
Free PE / Size 2424 / 75.75 GB
VG UUID oBU6Cq-DlqV-KvU0-vb0s-8yeC-qEh6-5WEdNd

--- Volume group ---
VG Name VG00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 68.66 GB
PE Size 32.00 MB
Total PE 2197
Alloc PE / Size 948 / 29.62 GB
Free PE / Size 1249 / 39.03 GB
VG UUID yKXukD-CeGa-qBCD-vupP-otiL-6zoA-skBeqk


lvdisplay:
--- Logical volume ---
LV Name /dev/VG01/movieLV
VG Name VG01
LV UUID S80lAj-hf2A-l7qy-nnvz-Xz0u-R01G-9L23fw
LV Write Access read/write
LV Status available
# open 1
LV Size 275.00 GB
Current LE 8800
Segments 2
Allocation inherit
Read ahead sectors 0
Block device 253:0

--- Logical volume ---
LV Name /dev/VG01/videoLV
VG Name VG01
LV UUID tDMw8c-8SHF-0mz5-Rnsi-jA4d-bpKJ-aJgzd4
LV Write Access read/write
LV Status available
# open 1
LV Size 50.00 GB
Current LE 1600
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:1

--- Logical volume ---
LV Name /dev/VG01/musicLV
VG Name VG01
LV UUID OPB0q9-IdoT-1lkd-2e0G-wz8Y-rgJB-EsoDeZ
LV Write Access read/write
LV Status available
# open 1
LV Size 65.00 GB
Current LE 2080
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:2

--- Logical volume ---
LV Name /dev/VG00/homeLV
VG Name VG00
LV UUID iv0Nsy-ec0r-dHzh-ekAq-mGZo-Ece4-H1Ryv5
LV Write Access read/write
LV Status available
# open 1
LV Size 4.88 GB
Current LE 156
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:3

--- Logical volume ---
LV Name /dev/VG00/usrLV
VG Name VG00
LV UUID ygBWam-4lQk-BY6Q-DcFN-wLAt-6BmV-c81tYs
LV Write Access read/write
LV Status available
# open 1
LV Size 19.88 GB
Current LE 636
Segments 2
Allocation inherit
Read ahead sectors 0
Block device 253:4

--- Logical volume ---
LV Name /dev/VG00/varLV
VG Name VG00
LV UUID HAGI1o-OyK5-UIln-YTU7-0UMo-6MH4-3zmB2e
LV Write Access read/write
LV Status available
# open 1
LV Size 4.88 GB
Current LE 156
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:5

[sideways]

your resize2fs binary is very old, eg in F8 I get

[root@localhost ~]# resize2fs
resize2fs 1.40.4 (31-Dec-2007)
Usage: resize2fs [-d debug_flags] [-f] [-F] [-p] device [new_size]

So maybe that is the problem, assuming you did the lvextend successfully, the format of the command is something like

lvextend -L +10G /dev/VolGroup00/LogVol00

and it will be successful if there are enough free physical extents in the volume group.

Are you running an old version of Fedora? You could install an updated resize2fs but if your OS is old it's probably better to boot up a livecd and do the resize from there.

[faa_70]

yes it's old...it's fc5...and i can't update which is why i need to fix it...i can't update even from a disk because there isn't enough space...so i need to extend the lv...but i can't because something is still running under /usr even when i'm in single user mode...

[sideways]

If you don't want to do it from a livecd, try a lazy umount or forced umount in single user mode (options -l and -f) - or alternatively do it from rescue mode on the install disk

[sidebrnz]

I'm not sure you're properly in single-user mode. I think you have to use

init=1

or

single

to get into it. If you don't want to mess with the root password (or have forgotten it)

init=/bin/bash

is supposed to get you to a bash prompt without a password, although I've never had to do it. Don't know if all the partitions are mounted or not. I think just /boot and / are, but don't quote me on this.