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You mean completely removing DRBD while preserving the data on its backing
device ? That should work out of the box, without any extra effort, as DRBD
works as a transparent layer and it does not modify the data on the backing
device.

Yannis




On Mon, 31 Aug 2020 at 09:39, Eric Robinson <eric.robinson@psmnv.com> wrote:

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> I may have missed this answer when I checked the manual, but we need to
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> Is that possible?
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> --Eric
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Yannis –

Here’s what I don’t understand.

The backing device is logical volume: /dev/vg1/lv1

The drbd volume is: drbd0

The filesystem is ext4 on /dev/drbd0

Since the filesystem is built on /dev/drbd0, not on /dev/vg1/lv1, if we remove drbd from the mix, can we then simply do:

# mount /dev/vg1/lv1 /mnt and find all the data there?

--Eric


From: Yannis Milios <yannis.milios@gmail.com>
Sent: Tuesday, September 1, 2020 4:47 AM
To: Eric Robinson <eric.robinson@psmnv.com>
Cc: drbd-user@lists.linbit.com
Subject: Re: [DRBD-user] Remove DRBD w/out Data Loss

You mean completely removing DRBD while preserving the data on its backing device ? That should work out of the box, without any extra effort, as DRBD works as a transparent layer and it does not modify the data on the backing device.

Yannis




On Mon, 31 Aug 2020 at 09:39, Eric Robinson <eric.robinson@psmnv.com<mailto:eric.robinson@psmnv.com>> wrote:













I may have missed this answer when I checked the manual, but we need to convert a DRBD cluster node into standalone server without losing the data. Is that possible?



--Eric









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On 01/09/2020 22:43, Eric Robinson wrote:
>
> Yannis –
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>  
>
> Here’s what I don’t understand.
>
>  
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> The backing device is logical volume: /dev/vg1/lv1
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>  
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> The drbd volume is: drbd0
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>  
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> The filesystem is ext4 on /dev/drbd0
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>  
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> Since the filesystem is built on /dev/drbd0, not on /dev/vg1/lv1, if
> we remove drbd from the mix, can we then simply do:
>
>  
>
> # mount /dev/vg1/lv1 /mnt and find all the data there?  
>

Ideally what you do is something like this lot (untested but looks
reasonable)

umount it
remove it from /etc/fstab
drbdadm down $resource
drbdadm wipe-md $resource
stop drbd
remove drbd config files
remove drbd from the system
decide whether to extend your filesystem into the extra space that was
previously used by DRBD at the end of /dev/vg1/lv1 or whether to reduce
the size of the LV (assuming internal metadata).
if extending then run resize2fs/xfs_growfs as applicable
if removing extra space then I'll leave it to you to work out how much
you can safely remove without destroying the filesystem!

DRBD metadata is kept at the end of the block device it occupies so
there is extra space on the end of /dev/vg1/lv1 that is not part of the
filesystem that's on that block device.

Trevor

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