DB2_PureScale環(huán)境HADR如何搭建

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#####HADR搭建######
1、創(chuàng)建主庫的備份
db2 BACKUP DB sampledb to /gpfs1nsd/backup

-- db2 backup db sampledb online to /gpfs1nsd/backup include logs

2、restore初始化備庫
db2 RESTORE DB sampledb from /gpfs1nsd/backup
-- db2 restore db sampledb from "/gpfs1nsd/backup" taken at 20170124085238 to "/gpfs1nsd/SAMPLEDB" logtarget "/gpfs1nsd/backup" with 2 buffers buffer 12800 replace history file parallelism 4

3、在主數(shù)據(jù)庫上，DBA 設(shè)置集群級別的 HADR 參數(shù)，這些參數(shù)指定備用集群和同步方式。
db2 "UPDATE DB CFG FOR sampledb USING\
HADR_TARGET_LIST  {psnode1-standby:4000|psnode2-standby:4000}\
HADR_REMOTE_HOST  {psnode1-standby:4000|psnode2-standby:4000}\
HADR_REMOTE_INST  db2sdin1\
HADR_SYNCMODE     async"
（參數(shù)需要重啟生效）
   
4、DBA 在主數(shù)據(jù)庫上設(shè)置成員級別 HADR 參數(shù)，這些參數(shù)標(biāo)識每個(gè)成員的地址和端口
對于成員 0：
db2 "UPDATE DB CFG FOR sampledb MEMBER 0 USING HADR_LOCAL_HOST psnode1-primay HADR_LOCAL_SVC 4000"
對于成員 1：
db2 "UPDATE DB CFG FOR sampledb MEMBER 1 USING HADR_LOCAL_HOST psnode2-primay HADR_LOCAL_SVC 4000"

5、在備用數(shù)據(jù)庫上，DBA 設(shè)置集群級別的 HADR 參數(shù)，這些參數(shù)指定主集群和同步方式
db2 "UPDATE DB CFG FOR sampledb USING\
HADR_TARGET_LIST  {psnode1-primay:4000|psnode2-primay:4000}\
HADR_REMOTE_HOST  {psnode1-primay:4000|psnode2-primay:4000}\
HADR_REMOTE_INST  db2inst1\
HADR_SYNCMODE     async"

6、DBA 在備用數(shù)據(jù)庫上設(shè)置成員級別 HADR 參數(shù)，這些參數(shù)標(biāo)識每個(gè)成員的地址和端口：
對于成員 0：
db2 "UPDATE DB CFG FOR sampledb MEMBER 0 USING HADR_LOCAL_HOST psnode1-standby HADR_LOCAL_SVC 4000"
對于成員 1：
db2 "UPDATE DB CFG FOR sampledb MEMBER 1 USING HADR_LOCAL_HOST psnode2-standby HADR_LOCAL_SVC 4000"
       
7、啟動(dòng)備庫
db2 START HADR ON DB sampledb AS STANDBY

db2sdin1@psnode1:/gpfs1nsd/backup> db2 START HADR ON DB sampledb AS STANDBY
SQL1766W  The command completed successfully. However, LOGINDEXBUILD was not
enabled before HADR was started.

8、啟動(dòng)主庫
db2 START HADR ON DB sampledb AS PRIMARY

db2inst1@psnode2:/gpfs1nsd/backup> db2 START HADR ON DB sampledb AS PRIMARY
SQL1766W  The command completed successfully. However, LOGINDEXBUILD was not
enabled before HADR was started.

9、檢查HADR

db2 "select LOG_STREAM_ID, PRIMARY_MEMBER, STANDBY_MEMBER, HADR_STATE from table (mon_get_hadr(-2))"
LOG_STREAM_ID PRIMARY_MEMBER STANDBY_MEMBER HADR_STATE            
------------- -------------- -------------- -----------------------
           1              1              0 PEER                  
           0              0              0 PEER                  

 2 record(s) selected.

db2pd -d sampledb -hadr
db2 get db cfg for sampledb | grep -i hadr

#####角色切換####



1、DBA 確保主項(xiàng)上成員均不處于異常狀態(tài)：

db2inst1@psnode1:~> db2 "SELECT ID,varchar(STATE,21) AS STATE,varchar(HOME_HOST,10) AS HOME_HOST, varchar(CURRENT_HOST,10) AS CUR_HOST, ALERT FROM SYSIBMADM.DB2_MEMBER"

ID     STATE                 HOME_HOST  CUR_HOST   ALERT  
------ --------------------- ---------- ---------- --------
    0 STARTED               psnode1    psnode1    NO    
    1 STARTED               psnode2    psnode2    NO    

 2 record(s) selected.

2、DBA 確保所有日志流處于 PEER 狀態(tài)：
db2inst1@psnode1:~> db2 "select LOG_STREAM_ID, PRIMARY_MEMBER, STANDBY_MEMBER, HADR_STATE from table (mon_get_hadr(-2))"

LOG_STREAM_ID PRIMARY_MEMBER STANDBY_MEMBER HADR_STATE            
------------- -------------- -------------- -----------------------
           1              1              0 PEER                  
           0              0              0 PEER                  

 2 record(s) selected.


3、在standby，DBA 對成員 0 發(fā)出 TAKEOVER HADR 命令：
db2sdin1@psnode1:~> db2 TAKEOVER HADR ON DB sampledb
DB20000I  The TAKEOVER HADR ON DATABASE command completed successfully.

4、在primary，DBA 在備用項(xiàng)上停用數(shù)據(jù)庫（這使數(shù)據(jù)庫保持處于 HADR 備用項(xiàng)的角色）：
db2 DEACTIVATE DATABASE sampledb
db2stop
執(zhí)行維護(hù)操作
db2start
db2 activate database sampledb


5、在primary，執(zhí)行切換命令
db2 TAKEOVER HADR ON DB sampledb

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