[CentOS] Troubles expanding file system.

Stephen John Smoogen
2021-09-01T17:15:37Z

On Wed, 1 Sept 2021 at 12:42, Jeff Boyce <jboyce at meridianenv.com>
wrote:
>
> Greetings -
>
>      I have tried posting this four times now, from two different email
> addresses (on the 25th, 27th, 30th, and 31st) and it never appeared.  I
> don't see it in the archives, so it appears to be getting dropped in
> transition for some reason.  I am not getting messages from the email
> system saying it is undeliverable, or is bounced; I am sending as plain
> text, not HTML, I stripped off my signature.  If this makes it through,
> someone please give me a clue why the others might not have.  But that
> is not as important as the real issue that I am trying to get addressed
> below.  Thanks for any assistance.
>
>      I have a Dell PowerEdge server with a CentOS KVM host (Earth) with
> one CentOS guest (Sequoia) that I am trying to expand the partition and
> filesystem on.  I have LVM logical volumes on the host system (Earth),
> which are used as devices/partitions on the guest system (Sequoia).  In
> this particular situation I have successfully extended the logical
> volume (lv_SeqEco) on Earth from 500GB to 700GB.
>
> 1.  Checking the disk information (lsblk) on Earth shows that the
> logical volume (lv_SeqEco) is now listed as 700GB.
>
> 2.  Checking disk information (lsblk) on Sequoia shows that the disk
> /dev/vde is still listed as 500GB, and partition /dev/vde1 where the
> mount point /ecosystem is located is also listed as 500GB.
>
> 3.  I had tried using the resize2fs command to expand the filesystem on
> /dev/vde1, but it returned with the result that there was nothing to
> do.  Which makes sense now after I checked the disk information, since
> /dev/vde on Sequoia has not increased from 500GB to 700GB.
>

Thanks for the long list of items of what you have done. In Fedora
Infrastructure, we used this method to resize images in the past
https://pagure.io/infra-docs/blob/main/f/docs/sysadmin-guide/sops/guestdisk.rst

The guest system usually needs to have the `fdisk` , `gdisk` or
`parted` commands rerun to resize the disk to its new size.


> 4.  On previous occasions when I have done this task, I would just start
> GParted on Sequoia and use the GUI to expand the partition and
> filesystem.  A real quick and simple solution.
>
> 5.  The problem I have now is that the VGA adapter on my server has died
> and I have no graphical output to the attached monitor, nor to the iDrac
> console display.  So I am stuck doing this entirely by the command line
> while logged into the system remotely.
>
> 6.  I suspect that I need to rescan the devices on Sequoia so that it
> recognizes the increased space that has been allocated from the extended
> the logical volume.  But when I did that (command below) it came back
> with a no such file or directory.
>
> echo 1 > /sys/class/block/vde1/device/rescan
>

Not sure that would do anything.


> 7.  This server is being retired in the next few months, but I need this
> additional space prior to migrating to the new system. Can someone give
> me some guidance on what I am missing in this sequence?
>
> Let me know if I haven't been clear enough in the explanation of my
> systems and objective.  Thanks.
>
> Jeff
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> CentOS at centos.org
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--
Stephen J Smoogen.
I've seen things you people wouldn't believe. Flame wars in
sci.astro.orion. I have seen SPAM filters overload because of Godwin's
Law. All those moments will be lost in time... like posts on a BBS...
time to shutdown -h now.