[DRBD-user] Guarantee write to both nodes

Reindy reindy at gmail.com
Mon Mar 22 02:23:09 CET 2010

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

actually you should not worry about synchronizing between your node1 and
node2. Well I know you also known about this but just to make sure that we
are on the same page.
Because during your node2 in an offline/shutdown mode, the node1 of course
will taking care of your synchronization of the data. As soon as node2 back
online, node2 will sync it from the node1, therefore you will get the same
database again as what you expected this DRBD is here in the first place.
You should combine it with the heartbeat to make it even more usable in
terms of downtime and taking over for this kind of situation.

On Sat, Mar 20, 2010 at 12:38 AM, Digimer <linux at alteeve.com> wrote:

> On 10-03-19 11:24 AM, Yuri Ushakov wrote:
>> I need synchronous replication over network, but with one strict rule -
>> if DRBD says something is written, it should already be written to both
>> nodes. When secondary is down, and DRBD is still writing to the primary
>> - that is not really synchronous replication. That behaviour makes it
>> asynchronous, because actual write to the secondary node is delayed.
>> In general, I want to ensure that when database transaction is commited,
>> the data rests on both nodes. If secondary is unavailable, transaction
>> should be rolled back.
>> Thanks,
>> Yuri.
> Hmm, it seems like it's a bit outside of the original goal of DRBD, but it
> might be doable via the 'on-io-error' or 'fencing' options. Take a look at
> this: http://www.drbd.org/users-guide/re-drbdconf.html
> --
> Digimer
> E-Mail:         linux at alteeve.com
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