[DRBD-user] Sync two different versions of DRBD

[yves]

Hello,

thank you for the replies. To summarize the question even more:

- Two servers are DRDB 8.0.16 and sync data, on CentOS 5.

- Only the secondary will be upgraded 8.4 on CentOS 6.

Can the secondary 8.4 still sync (and get its data updated) *safely* from
the 8.0.16 one, using the same protocol C?

(note: 8.0.16 will always be primary until it crashes or/and is later
upgraded as well to 8.4)


Thank you.

Regards

   Yves


On Fri, Mar 13, 2015 at 5:37 PM, Prater, James K. <jprater at draper.com>
wrote:

>  Hello Yves,
>
> I would really check with or at least wait for Lars from Linbit to
> respond. At first glance, I would update "B" so you can do some initial
> testing. Since you may have some issues re compiling components. Then allow
> the normal transactions to occur from "A" by connecting it to the primary.
> The update DRDB on "A". You should not require the data to be invalidated.
> We are still talking about release "8.x". It should be backwards compatible.
>
> James
>
>  *From*: yves [mailto:user at kochira.com]
> *Sent*: Thursday, March 12, 2015 10:45 AM
> *To*: drbd-user at lists.linbit.com <drbd-user at lists.linbit.com>
> *Subject*: [DRBD-user] Sync two different versions of DRBD
>
>  Hello,
>
>  two servers A (primary) and B (secondary), are each using DRBD 8.0.16
> via protocol C.
>
>  Since only one can be migrated to 8.4 at a time, is it possible to
>
>  - keep unchanged A (8.0.16)
> - install 8.4 on B (similar config with protocol C)
> - invalidate B data (created from 8.0.16)
> - sync A -> B
>
>  and keep this for a few days.
>
>  Does it safely work?
>
>  Thank you and regards,
>
>     Yves
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