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Extending file system after enlarging a logical volume

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  Extending file system after enlarging a logical volume Ken Heard <kenslists@teksavvy.com> - 2016-10-03 22:30 +0200
    Re: Extending file system after enlarging a logical volume <tomas@tuxteam.de> - 2016-10-03 22:40 +0200
    Re: Extending file system after enlarging a logical volume Tilo Werner <tilo@moosbee.de> - 2016-10-03 22:50 +0200

#173162 — Extending file system after enlarging a logical volume

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In my jessie box I need to increase the non-encrypted root partition
(/) size from 14G to 19G.  I was able successfully to increase the
logical volume (and decrease the space available in the volume group
accordingly) but am not sure how to do the next step.

The following command produced the result shown.

root@BDS:~# fsadm resize /dev/BDS1/root
resize2fs 1.42.12 (29-Aug-2014)
Filesystem at /dev/mapper/BDS1-root is mounted on /; on-line resizing
required
old_desc_blocks = 1, new_desc_blocks = 2
resize2fs: Read-only file system While checking for on-line resizing
support
fsadm: Resize ext4 failed

Does the phrase "on-line resizing required" mean that I have to
unmount /dev/BDS1/root, then run the fsadm command and finally remount
/dev/BDS1/root?  Is unmounting the basic partition (/) safe while
presumably some of the files there are being used by the computer?

I think I read somewhere that to resize an ext4 partition did not
require unmounting it.  Perhaps it it is required.

Regards, Ken Heard
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#173163

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On Mon, Oct 03, 2016 at 04:24:42PM -0400, Ken Heard wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> In my jessie box I need to increase the non-encrypted root partition
> (/) size from 14G to 19G.  I was able successfully to increase the
> logical volume (and decrease the space available in the volume group
> accordingly) but am not sure how to do the next step.
> 
> The following command produced the result shown.
> 
> root@BDS:~# fsadm resize /dev/BDS1/root
> resize2fs 1.42.12 (29-Aug-2014)
> Filesystem at /dev/mapper/BDS1-root is mounted on /; on-line resizing
> required

Online resizing means "resizing a mounted file system". This is possible
(for ext*), as long as you are growing, not shrinking. But that's your
case.

> old_desc_blocks = 1, new_desc_blocks = 2
> resize2fs: Read-only file system While checking for on-line resizing
> support
> fsadm: Resize ext4 failed

That's because your / partition is mounted read-only. This might be
because there were some errors at mount, so perhaps running a file
system check (fsck.ext4) might be a good idea.

If you *know* your file system is OK, you could try to remount it
read-write:

  mount -orw,remount /dev/mapper/BDS1-root /

then resizing should work.

> Does the phrase "on-line resizing required" mean that I have to
> unmount /dev/BDS1/root, then run the fsadm command and finally remount
> /dev/BDS1/root?  Is unmounting the basic partition (/) safe while
> presumably some of the files there are being used by the computer?

No, see above. And you can't umount / (you'd get an error stating
that the file system is busy. / is always busy).

> I think I read somewhere that to resize an ext4 partition did not
> require unmounting it.  Perhaps it it is required.

Only for shrinking. In that case you'd have to mount the file system
from "another running system", e.g a rescue system.

regards
- -- tomás
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#173165

[Multipart message — attachments visible in raw view] — view raw

Next time try using lvresize -r -L $NewSize $LV works for ext* and
enlarging.

Regards,
Tilo

Am 03.10.2016 um 22:24 schrieb Ken Heard:
> In my jessie box I need to increase the non-encrypted root partition
> (/) size from 14G to 19G.  I was able successfully to increase the
> logical volume (and decrease the space available in the volume group
> accordingly) but am not sure how to do the next step.
> 
> The following command produced the result shown.
> 
> root@BDS:~# fsadm resize /dev/BDS1/root
> resize2fs 1.42.12 (29-Aug-2014)
> Filesystem at /dev/mapper/BDS1-root is mounted on /; on-line resizing
> required
> old_desc_blocks = 1, new_desc_blocks = 2
> resize2fs: Read-only file system While checking for on-line resizing
> support
> fsadm: Resize ext4 failed
> 
> Does the phrase "on-line resizing required" mean that I have to
> unmount /dev/BDS1/root, then run the fsadm command and finally remount
> /dev/BDS1/root?  Is unmounting the basic partition (/) safe while
> presumably some of the files there are being used by the computer?
> 
> I think I read somewhere that to resize an ext4 partition did not
> require unmounting it.  Perhaps it it is required.
> 
> Regards, Ken Heard
> 

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