Understanding 'State change failed: (-2) Need access to UpToDate data'

[Paul O'Rorke]

Hi list,

I had to relocate my third node in a classic DRBD 8.4 three node set up 
to a new host.  I am having difficulty making the stacked resource the 
primary.  I am following this guide: 
https://www.linbit.com/drbd-user-guide/users-guide-drbd-8-4/#s-three-nodes

Specifically this:
>
>
>         5.18.3. Enabling stacked resources
>
> To enable a stacked resource, you first enable its lower-level 
> resource and promote it:
>
> drbdadm up r0
> drbdadm primary r0
>
> As with unstacked resources, you must create DRBD meta data on the 
> stacked resources. This is done using the following command:
>
> # drbdadm create-md --stacked r0-U
>
> Then, you may enable the stacked resource:
>
> # drbdadm up --stacked r0-U
> # drbdadm primary --stacked r0-U
>
> After this, you may bring up the resource on the backup node, enabling 
> three-node replication:
>
> # drbdadm create-md r0-U
> # drbdadm up r0-U
It seems all is good right up to the last command:

:~# drbdadm primary informer
:~# drbdadm create-md --stacked informer-U
You want me to create a v08 style flexible-size internal meta data block.
There appears to be a v08 flexible-size internal meta data block
already in place on /dev/drbd11 at byte offset 429483581440

Do you really want to overwrite the existing meta-data?
[need to type 'yes' to confirm] yes

md_offset 429483581440
al_offset 429483548672
bm_offset 429470441472

Found some data

  ==> This might destroy existing data! <==

Do you want to proceed?
[need to type 'yes' to confirm] yes

initializing activity log
NOT initializing bitmap
Writing meta data...
New drbd meta data block successfully created.
:~# drbdadm up --stacked informer-U
:~# drbdadm primary --stacked informer-U
110: State change failed: (-2) Need access to UpToDate data
Command 'drbdsetup-84 primary 110' terminated with exit code 17

drbd11 is the device for the lower level resource 'informer', drbd110 
the device for stacked resource 'informer-U'.  Replication between hosts 
'Alice' and 'Bob' (not the real host names but corresponding to the 
names used int the documentation) is functional.  I am performing the 
above commands on 'bob'.

I do not understand why it is complaining it needs UpToDate data in that 
last command if 'informer-U' is 'stacked-on-top-of informer' and was 
just created.

the .res file(s) look like this:

> resource informer {
>         net {
>                 protocol C;
>         }
>
>         device    /dev/drbd11;
>         meta-disk internal;
>
>         on trk-kvm-01 {
>                 address 10.10.1.125:7789;
>                 disk      /dev/trk-kvm-01-vg/informer;
>              }
>              on trk-kvm-02 {
>                 address 10.10.1.126:7789;
>                 disk      /dev/trk-kvm-02-vg/informer;
>         }
> }
>
> resource informer-U {
>         net {
>                 protocol A;
>         }
>
>         stacked-on-top-of informer {
>                 device /dev/drbd110;
>                 address 10.10.2.126:7789;
>         }
>
>         on trk-bkp-01 {
>                 device  /dev/drbd110;
>                 disk    /dev/ubuntu-vg/informer;
>                 address 10.10.2.127:7789;
>                 meta-disk internal;
>         }
> }
Any suggestions on what I am missing in this picture?

Please and thanks.
-- 
Paul O'Rorke
Tracker Software Products (Canada) Limited
www.tracker-software.com <https://www.tracker-software.com>
Tel: +1 (250) 324 1621
Fax: +1 (250) 324 1623



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