[Linux-cluster] CS4 / U2/U3/U4/ problem about cluster_id generation

[Alain Moulle]

Hi

There is a problem of unicity of cluster_id :

I have a big configuration with lots of CS4 clusters in pairs.
The cluster_names are such as :
iocell1 for first pair
iocell2 for 2nd one
...

Naming is automatic as there are lots of HA node pairs.

ok, now let's take the cluster iocell13 and iocell21 and the
algorythm in cnxman.c :

static uint16_t generate_cluster_id(char *name)
{
        int i;
        int value = 0;

        for (i=0; i<strlen(name); i++) {
                value <<= 1;
                value += name[i];
        }
        return value & 0xFFFF;
}

For iocell13 :
[[[[[[["i"/0x69]*2+"o"/0x6f]*2+"c"/0x63]*2+"e"/0x65]*2+"l"/0x6c]*2+&qu
ot;l"/0x6c]*2+"1"/0x31]*2+"3"/0x33 == 0x6895 == 26773).

and for iocell21:
[[[[[[["i"/0x69]*2+"o"/0x6f]*2+"c"/0x63]*2+"e"/0x65]*2+"l"/0x6c]*2+&qu
ot;l"/0x6c]*2+"2"/0x32]*2+"1"/0x31 == 0x6895 == 26773).

so we have two identical cluster_id for two different cluster
(based on cluster names).

So there is problem because a node denies/un-acks the joins since the same
"cluster-id" is claimed but with an other Cluster name also checked

I've checked that algorythm has not been modified since U2 , and therefore
the problem remains for sure with U4.

Any idea to solve it for sure ?

Thanks
Alain