Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 2005-12-14T18:59:29, Christof Amelunxen <ca at ordix.de> wrote:
> Hi all,
>
> we are currently implementing an informix dbms cluster using Linux-HA
> (1.2.3) and drbd (0.7.5) on SLES9 SP2. Everything is working perfectly
> well so far, thanks a lot for all the work that has been done.
>
> I have a question about a special situation that may be an FAQ but still I
> didnt find any answers yet:
>
> 1. NodeA (P) --- NodeB (S) # everything ok
> 2. NodeA (P) - - NodeB (S) # DRBD detects connection loss, goes WFC
> 3. NodeA (P) - - NodeB (S) # Linux-HA detects split brain, A kills B
> 4. / - - NodeB (P) # NodeB takes over, goes primary
>
> There have been writes on NodeA between step 2 and 3. These are lost after
> Linux-HA has killed A and made B primary. I know the best solution is to
> avoid this situation by any chance and we are using serial heartbeats,
> too, but what if it happens anyway?
The writes are lost.
Sincerely,
Lars Marowsky-Brée
--
High Availability & Clustering
SUSE Labs, Research and Development
SUSE LINUX Products GmbH - A Novell Business -- Charles Darwin
"Ignorance more frequently begets confidence than does knowledge"