[linux-lvm] lvextend problem

[linux-lvm] lvextend problem

[Jens Berlips]

Hello

I have two partitions on a 80gb harddrive.

/dev/hdb1
/dev/hdb2

I have created a VG called store_vg.
$vgcreate store_vg /dev/hdb2
then
$lvcreate -lXXX -nstore_lv store_vg
creating an LV using all space left on hdb2

What I wanted to do next was adding the hdb1
without loosing the data on hdb2.

So I did.
vgextend store_vg /dev/hdb1
then
lvextend -lXXX /dev/store_vg/store_lv /dev/hdb1

But I noticed that this didnt work and when doing a
$ df. I got the same results as before. I guess this has
to do with hdb1 not being formatted (using mkfs.xfs) correctly. When
reformatting the entire LV (extended with hdb1) I got everything to work.
But all data lost.

This was more of a test, so I didn't loose any critical data. But how
should this proceedure be done correctly?

Thanks in advance
Jens Berlips

Re: [linux-lvm] lvextend problem

[Tim]

you need to 

1) extend the volume group (which you did)
2) extend the logical volume (which you did), and
3) extend the filesystem

before df will show the changes.  The last item is the trickiest, I know
it *should* work with ext3, but when I did my big migration I added a
new LV and built a new fs on that -- no room for error since recovering
from a failure would take too long (1/2TB of live data!).  With ext2 I
would have bit the bullet and done the extend.  As for other
filesystems, I have no idea.  ReiserFS gave me trouble with NFS/Samba so
I dropped it, maybe XFS is better, but I use ext3 for compatibiliy.

I think Andreas Dilger on this list actually maintains the ext2resize
codebase (or helps to, or took over from Ted T'so, or something) so
he'll hopefully chime in soon.  Bottom line, make your backups first!


--t



Quoth Jens Berlips:
> Hello
> 
> I have two partitions on a 80gb harddrive.
> 
> /dev/hdb1
> /dev/hdb2
> 
> I have created a VG called store_vg.
> $vgcreate store_vg /dev/hdb2
> then
> $lvcreate -lXXX -nstore_lv store_vg
> creating an LV using all space left on hdb2
> 
> What I wanted to do next was adding the hdb1
> without loosing the data on hdb2.
> 
> So I did.
> vgextend store_vg /dev/hdb1
> then
> lvextend -lXXX /dev/store_vg/store_lv /dev/hdb1
> 
> But I noticed that this didnt work and when doing a
> $ df. I got the same results as before. I guess this has
> to do with hdb1 not being formatted (using mkfs.xfs) correctly. When
> reformatting the entire LV (extended with hdb1) I got everything to work.
> But all data lost.
> 
> This was more of a test, so I didn't loose any critical data. But how
> should this proceedure be done correctly?
> 
> Thanks in advance
> Jens Berlips
> 
> 
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

-- 
    "Make it ten... I am only a poor corrupt official."
                  --Capt. Louis Renault, _Casablanca_

Re: [linux-lvm] lvextend problem

[Friedrich Lobenstock]

On Sat, 16 Mar 2002 20:12, Tim wrote:

>
> you need to
>
> 1) extend the volume group (which you did)
> 2) extend the logical volume (which you did), and
> 3) extend the filesystem

If you've used a ReiserFS filesystem a
  /sbin/resize_reiserfs /dev/store_vg/store_lv
would have done the trick - online!

I can only say resize_reiserfs works like a charm for me.

-- 
MfG / Regards
Friedrich Lobenstock

Re: [linux-lvm] lvextend problem

[bo]

> > 1) extend the volume group (which you did)
> > 2) extend the logical volume (which you did), and
> > 3) extend the filesystem
>
> If you've used a ReiserFS filesystem a
>   /sbin/resize_reiserfs /dev/store_vg/store_lv
> would have done the trick - online!
>
> I can only say resize_reiserfs works like a charm for me.
>
From my experiences,
mkreiserfs takes more time than resize_reiserfs, and also it has a
message like "formating" but no such message on resize_reiserfs.
I thought resize_reiserfs does not format the device added but it did not
have any problem to access after resize.

My question is "Does resize_reiserfs format the device which is added and
unformatted yet?"

Bo

[linux-lvm] lvextend problem

[Guilio Iannazzo]

Hi,
about the *environment* :
[root@priscilla var]# cat /proc/version
Linux version 2.4.21-20.ELsmp (bhcompile@tweety.build.redhat.com) (gcc 
version 3.2.3 20030502 (Red Hat Linux 3.2.3-42)) #1 SMP Wed Aug 18 
20:46:40 EDT 2004

The *problem* :
I extended a logical volume following the procedure

umount -l /dev/Volume00/var

lvextend -L+5G /dev/Volume00/var
e2fsck -f /dev/Volume00/var
mount -l /dev/Volume00/var

The ouput of e2fsck was as following : 

[root@priscilla var]# e2fsck -f /dev/Volume00/var
e2fsck 1.32 (09-Nov-2002)
Pass 1: Checking inodes, blocks, and sizes
Duplicate blocks found... invoking duplicate block passes.
Pass 1B: Rescan for duplicate/bad blocks
Duplicate/bad block(s) in inode 40962: 164114 164115 164117
Duplicate/bad block(s) in inode 122885: 491781
Pass 1C: Scan directories for inodes with dup blocks.
Pass 1D: Reconciling duplicate blocks
(There are 2 inodes containing duplicate/bad blocks.)

File /run/utmp (inode #40962, mod time Tue Feb 27 10:20:28 2007)
  has 3 duplicate block(s), shared with 1 file(s):
        <filesystem metadata>
Clone duplicate/bad blocks<y>? yes

File /log/audit.d/bin.1 (inode #122885, mod time Tue Feb 27 14:01:00 2007)
  has 1 duplicate block(s), shared with 1 file(s):
        <filesystem metadata>
Clone duplicate/bad blocks<y>? yes

Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

/dev/Volume00/var: ***** FILE SYSTEM WAS MODIFIED *****
/dev/Volume00/var: 553/1572864 files (14.8% non-contiguous), 
706071/6291456 blocks

Now, once the filesystem mounted, I've lost all the data I had on /var 
(which I didn't back up, I know I know it's extremely stupid, luckily 
enough this is not a production machine).
For example

[root@priscilla var]# ll /var/
total 0

however

[root@priscilla var]# mkdir /var/log
mkdir: cannot create directory `/var/log': File exists

??
What happened ? How to get all the data back ?
Thank you

Giulio

Re: [linux-lvm] lvextend problem

[Luca Berra]

On Tue, Feb 27, 2007 at 04:55:00PM +0100, Guilio Iannazzo wrote:
>Hi,
>about the *environment* :
>[root@priscilla var]# cat /proc/version
>Linux version 2.4.21-20.ELsmp (bhcompile@tweety.build.redhat.com) (gcc 
>version 3.2.3 20030502 (Red Hat Linux 3.2.3-42)) #1 SMP Wed Aug 18 
>20:46:40 EDT 2004
>
>The *problem* :
>I extended a logical volume following the procedure
>
>umount -l /dev/Volume00/var

from umount man page:
       -l     Lazy unmount. Detach the filesystem from the filesystem  hierar-
              chy now, and cleanup all references to the filesystem as soon as
              it is not busy anymore.  (Requires kernel 2.4.11 or later.)

the key phrase here is: "as soon as it is not busy anymore"

>lvextend -L+5G /dev/Volume00/var
harmless

>e2fsck -f /dev/Volume00/var
so you fscked an active filesystem, bad bad bad...

--- i think you wanted to resize2fs here ---
>mount -l /dev/Volume00/var
'mount -l' is _not_ the opposite of 'umount -l'

....
>
>Now, once the filesystem mounted, I've lost all the data I had on /var 
>(which I didn't back up, I know I know it's extremely stupid, luckily 
>enough this is not a production machine).
>For example
>
>[root@priscilla var]# ll /var/
>total 0
>
>however
>
>[root@priscilla var]# mkdir /var/log
>mkdir: cannot create directory `/var/log': File exists
>
>??
>What happened ? How to get all the data back ?
is the filesystem really mounted now?

- reboot the machine into single user
- fsck the filesystem again
- and try mounting it and check all data is still here.
if it is:
- backup your data
- umount the filesystem (really, not using -l)
- fsck -f 
- resize2fs
- mount again
- return to multi-user

-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
 /"\
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  X        AGAINST HTML MAIL
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[linux-lvm] lvextend problem

[Nikolay Yevik]

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Greetings,

 

I would greatly appreciate if anyone can help me with the issue I am
having with vgextend.

I am trying to extend my LV but getting error about insufficient
extents, while there are enough free PEs in the VG.

 

Here is setup information:

# lvm version

  LVM version:     2.02.13 (2006-10-27)

  Library version: 1.02.12 (2006-10-13)

  Driver version:  4.7.0

 

# pvs

  PV         VG     Fmt  Attr PSize PFree

  /dev/sda2  system lvm2 a-   6.50G 708.00M

  /dev/sda3  data   lvm2 a-   1.42G      0

  /dev/sdb1  data   lvm2 a-   2.99G      0

  /dev/sdc1  system lvm2 a-   2.99G   2.99G

 

# vgs

  VG     #PV #LV #SN Attr   VSize VFree

  data     2   3   0 wz--n- 4.41G    0

  system   2   3   0 wz--n- 9.49G 3.68G

 

# lvs

  LV    VG     Attr   LSize   Origin Snap%  Move Log Copy%

  data1 data   -wi-ao 728.00M

  data2 data   -wi-ao 728.00M

  data3 data   -wi-ao   2.99G

  home  system -wi-ao 128.00M

  root  system -wi-ao   5.00G

  swap  system -wi-ao 700.00M

 

# vgdisplay

  --- Volume group ---

  VG Name               data

  System ID

  Format                lvm2

  Metadata Areas        2

  Metadata Sequence No  11

  VG Access             read/write

  VG Status             resizable

  MAX LV                0

  Cur LV                3

  Open LV               3

  Max PV                0

  Cur PV                2

  Act PV                2

  VG Size               4.41 GB

  PE Size               4.00 MB

  Total PE              1130

  Alloc PE / Size       1130 / 4.41 GB

  Free  PE / Size       0 / 0

  VG UUID               4I2UCL-raKY-a6Kt-b2SE-2vAV-vHB9-UndWx9

 

  --- Volume group ---

  VG Name               system

  System ID

  Format                lvm2

  Metadata Areas        2

  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                2

  Act PV                2

  VG Size               9.49 GB

  PE Size               4.00 MB

  Total PE              2430

  Alloc PE / Size       1487 / 5.81 GB

  Free  PE / Size       943 / 3.68 GB

  VG UUID               KQ3dPF-X92n-0HVb-sYl5-iARG-wUEX-iEGJsG

 

# lvscan

  ACTIVE            '/dev/data/data1' [728.00 MB] inherit

  ACTIVE            '/dev/data/data2' [728.00 MB] inherit

  ACTIVE            '/dev/data/data3' [2.99 GB] inherit

  ACTIVE            '/dev/system/home' [128.00 MB] inherit

  ACTIVE            '/dev/system/root' [5.00 GB] inherit

  ACTIVE            '/dev/system/swap' [700.00 MB] inherit

 

# mount

/dev/mapper/system-root on / type ext3 (rw,acl,user_xattr)

proc on /proc type proc (rw)

sysfs on /sys type sysfs (rw)

debugfs on /sys/kernel/debug type debugfs (rw)

udev on /dev type tmpfs (rw)

devpts on /dev/pts type devpts (rw,mode=0620,gid=5)

/dev/sda1 on /boot type ext3 (rw,acl,user_xattr)

/dev/mapper/system-home on /home type ext3 (rw,acl,user_xattr)

/dev/mapper/data-data1 on /mnt/data1 type ext3 (rw,acl,user_xattr)

/dev/mapper/data-data2 on /mnt/data2 type ext3 (rw,acl,user_xattr)

/dev/mapper/data-data3 on /mnt/data3 type ext3 (rw,acl,user_xattr)

.host:/ on /mnt/hgfs type vmhgfs (rw,ttl=5)

securityfs on /sys/kernel/security type securityfs (rw)

none on /proc/fs/vmblock/mountPoint type vmblock (rw)

 

So "system" VG uses /dev/sda2 with 708M free and /dev/sdc1 with 2.99G
free.

This is confirmed by:

 

#pvdisplay /dev/sda2

  --- Physical volume ---

  PV Name               /dev/sda2

  VG Name               system

  PV Size               6.50 GB / not usable 3.76 MB

  Allocatable           yes

  PE Size (KByte)       4096

  Total PE              1664

  Free PE               177

  Allocated PE          1487

  PV UUID               fYVfh6-wMQ2-X2Zv-AJ6R-2CgK-c97o-KfPoLz

 

# pvdisplay /dev/sdc1

  --- Physical volume ---

  PV Name               /dev/sdc1

  VG Name               system

  PV Size               3.00 GB / not usable 3.07 MB

  Allocatable           yes

  PE Size (KByte)       4096

  Total PE              766

  Free PE               766

  Allocated PE          0

  PV UUID               XUUjaG-okI9-AQbG-JLwa-oqBO-rkse-pTyg53

 

So there is a total of free 943 PE (4M each) in "system" VG. 

 

I want to extend /dev/system/root:

 

# lvextend -l+2 /dev/system/root /dev/sdc1

  Extending logical volume root to 5.01 GB

  Insufficient free space: 1282 extents needed, but only 766 available

 

Or 

 

# lvextend -l+2 /dev/system/root

  Extending logical volume root to 5.01 GB

  Insufficient free space: 1282 extents needed, but only 943 available

 

Same if I specify actual size (in MB or GB) instead if number of PEs.

 

Looks like it tries to reallocate the whole LV to the size needed
instead of just adding the needed size from VG free space

to the already existing LV.

 

What I am not understanding or missing here?

 

 

Respectfully,

 

Nikolay V. Yevik

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Re: [linux-lvm] lvextend problem

[Alasdair G Kergon]

On Thu, Jun 14, 2007 at 01:08:30PM -0500, Nikolay Yevik wrote:
>   LVM version:     2.02.13 (2006-10-27)
 
Upgrade.  There was a bug causing this (only) in 2.02.13.

Alasdair
-- 
agk@redhat.com

RE: [linux-lvm] lvextend problem

[Nikolay Yevik]

Thanks,

I updated to lvm2-2.02.13-10.2 (this is on OpenSUSE 10.2) and the
problem went away.


-----Original Message-----
From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com]
On Behalf Of Alasdair G Kergon
Sent: Thursday, June 14, 2007 2:02 PM
To: LVM general discussion and development
Subject: Re: [linux-lvm] lvextend problem

On Thu, Jun 14, 2007 at 01:08:30PM -0500, Nikolay Yevik wrote:
>   LVM version:     2.02.13 (2006-10-27)
 
Upgrade.  There was a bug causing this (only) in 2.02.13.

Alasdair
-- 
agk@redhat.com

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