1、当前环境
（1）BWP和BWD在同一个数据库中，BWD的实例为03，BWP的实例为02
2、问题描述
（1）BWP和BWD无法同时启动。
（2）当BWD启动时，启动BWP，提示：Exiting with Return-Code 3. (No more child processes)
（3）当BWP启动时，BWD一直不能正常启动，直至timeout
3、查询日志
（1）如下日志：
HANABW:/usr/sap/BWP/HDB02/hanabw/trace> vi nameserver_alert_hanabw.trc
意思是系统开启了replication 功能，占用端口，
55589]{-1}[-1/-1] 2021-07-31 14:27:07.072139 e tns_ddl TNSClient.cpp(00917) : setServiceType no topology databaseId use service default: 2
[55602]{-1}[-1/-1] 2021-07-31 14:27:07.158369 e TrexNet Responder.cpp(00568) : can't listen on port 127.0.0.1:30302: host unknown
[55602]{-1}[-1/-1] 2021-07-31 14:27:07.158621 e TrexNet Responder.cpp(00568) : can't listen on port 127.0.0.2:30302: host unknown
[55602]{-1}[-1/-1] 2021-07-31 14:27:07.945683 e sr_dataaccess DisasterRecoveryPrimaryImpl.cpp(00637) : Listener cannot be started, because port 30301 is already in use!
[55602]{-1}[-1/-1] 2021-07-31 14:27:07.945695 e sr_dataaccess DisasterRecoveryPrimaryImpl.cpp(00638) : A system replication primary uses replication ports in the range of the next instancenr (own=02, next=03)
[55602]{-1}[-1/-1] 2021-07-31 14:27:07.945700 e sr_dataaccess DisasterRecoveryPrimaryImpl.cpp(00639) : Please check, that there is no other system on this machine using instancenr 03! This is just a hint and possibly not the root cause ..
[55602]{-1}[-1/-1] 2021-07-31 14:27:07.945701 e sr_dataaccess DisasterRecoveryPrimaryImpl.cpp(00640) : In general the port range 30300-30399 must not be used by any other process when system replication is turned on!
[55602]{-1}[-1/-1] 2021-07-31 14:27:07.945772 f PersistenceLayer PersistenceController.cpp(00604) : startup failed exception 1: no.2110008 (Basis/IO/Stream/impl/NetworkChannel.cpp:736)
Error address in use: $msg$, rc=98: Address already in use
$NetworkChannel$=
ListenerChannel FD 32 [0x00002ab1cf59a5c0] {refCnt=1, idx=18446744073709551615} 0.0.0.0/30301_tcp->(invalid) New,[----]
exception throw location:
1: 0x00002aaff0e4c0d0 in Stream::NetworkChannelBase::bindLocal()+0xd0 at NetworkChannel.cpp:736 (libhdbbasis.so)
4、问题分析：
（1）之前我给BWP做了一个replication的同步复制，也就是容灾到备机做测试。做完后我就没关闭，它在做replication过程会启用30300-30399之间的端口号
（2）BWD使用的ID是03，所以会使用30303
（3）BWP使用的ID是02，所以会使用30302.但是BWP启动时，因为有replication的功能，会使用30302之后的端口比如30303，所以总是提示被占用。
5、解决思路
我把BWP的replication 容灾功能关了，那么BWP启动时，30303就不会再使用到，也就不会在启动中和BWD有冲突。
（1）BWP-HANA数据库关闭后无法启动，提示HDB Daemon not running
（2）考虑内存占用问题，把BWD的hana库关闭
（3）重启BWP HANA，可以正常启动
