[DRBD-user] Question about Linux-HA, stonith and data loss

Lars Marowsky-Bree lmb at suse.de
Wed Dec 14 19:09:47 CET 2005

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.

    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"

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