Mysql server doesnt work when mgm server down (3 replies)

Hi,

I have problem with my Cluster installation,


[ndbd(NDB)] 2 node(s)
id=21 @10.100.15.150 (mysql-5.1.56 ndb-7.1.17, Nodegroup: 0, Master)
id=22 @10.100.15.160 (mysql-5.1.56 ndb-7.1.17, Nodegroup: 0)

[ndb_mgmd(MGM)] 1 node(s)
id=3 @10.100.15.150 (mysql-5.1.56 ndb-7.1.17)

[mysqld(API)] 2 node(s)
id=11 @10.100.15.150 (mysql-5.1.56 ndb-7.1.17)
id=12 @10.100.15.160 (mysql-5.1.56 ndb-7.1.17)





When i shutdown ndbmgm server,

i cannot read or insert data to mysqld servers from my apllication, the error i have got :

ERROR 1296 (HY000): Got error 157 'Unknown error code' from NDBCLUSTER


What can be the reason ?

Thx