{"id":37064,"date":"2020-02-20T15:06:36","date_gmt":"2020-02-20T22:06:36","guid":{"rendered":"https:\/\/virtual-dba.com\/?p=37064"},"modified":"2021-02-10T18:11:30","modified_gmt":"2021-02-11T01:11:30","slug":"setting-up-hadr-with-two-auxiliary-standbys","status":"publish","type":"post","link":"https:\/\/virtual-dba.com\/blog\/setting-up-hadr-with-two-auxiliary-standbys\/","title":{"rendered":"Setting Up HADR with Two Auxiliary Standbys"},"content":{"rendered":"\n

In my previous blog<\/a>, I presented some of the issues you can run into when setting up one auxiliary HADR standby and a potential solution. This blog discusses setting up two auxiliary standby databases in detail.<\/p>\n\n\n\n

Let’s start with all the information we need to set the configuration parameters:<\/p>\n\n\n

Host Info:<\/strong>
\nPrimary: \t\tdbpp.xxx.net
\nPrincipal standby: \tdbps.xxx.net
\nAuxiliary standby 1:\taux1-east.xxx.net
\nAuxiliary standby 2:\taux2-east.xxx.net<\/code><\/p>\n\n\n

Prerequisites:<\/p>\n\n\n\n

1. Make sure each node can ping every other node. You should be able to ping server 2, server 3 and server 4 from server 1; server2 should be able to ping each of the other servers, and so on.<\/p>\n\n\n\n

2. Make sure your \/etc\/hosts has all the ports defined for HADR for all the nodes.<\/p>\n\n\n

[db2inst1 ~]$ cat \/etc\/hosts | grep \u2013i hadr\ndb2_hadrp     50050\/tcp\ndb2_hadrs     50051\/tcp\ndb2_hadra     50052\/tcp\ndb2_hadrb     50053\/tcp\n<\/code><\/pre>\n\n\n
Next, we need to set the HADR configuration parameters on all the boxes. The main parameter we are interested in is HADR_TARGET_LIST. The idea is the same as setting up a single auxiliary box. Leave out the host you are on and put all the other hostnames in order along with the HADR ports.<\/p>\n\n\n\n
For example, when setting this parameter for the server aux1-east, HADR_TARGET_LIST would be:<\/p>\n\n\n
dbpp.xxx.net:50050|dbps.xxx.net:50051|aux2-east.xxx.net:50053<\/code><\/p>\n\n\n
Below is the sample configuration for all the boxes in my set-up.<\/p>\n\n\n\n
For the first auxiliary standby (aux1-east.xxx.net):<\/p>\n\n\n
[db2inst1@aux1-east.xxx.net]$ db2 get db cfg for sample | grep -i hadr\nHADR database role                                      = STANDARD\nHADR local host name                  (HADR_LOCAL_HOST) = aux1-east.xxx.net\nHADR local service name                (HADR_LOCAL_SVC) = 50052\nHADR remote host name                (HADR_REMOTE_HOST) = dbpp.xxx.net\nHADR remote service name              (HADR_REMOTE_SVC) = 50050\nHADR instance name of remote server  (HADR_REMOTE_INST) = db2inst1\nHADR timeout value                       (HADR_TIMEOUT) = 120\nHADR target list                     (HADR_TARGET_LIST) = dbpp.xxx.net:50050|dbpsxxx.net:50051|aux2-east.xxx.net:50053\nHADR log write synchronization mode     (HADR_SYNCMODE) = SUPERASYNC\nHADR spool log data limit (4KB)      (HADR_SPOOL_LIMIT) = 100000\nHADR log replay delay (seconds)     (HADR_REPLAY_DELAY) = 0\nHADR peer window duration (seconds)  (HADR_PEER_WINDOW) = 120\n<\/code><\/pre>\n\n\n
For the second auxiliary standby (aux2-east.xxx.net):<\/p>\n\n\n
[db2inst1@aux2-east.xxx.net]$ db2 get db cfg for sample | grep -i hadr\nHADR database role                                      = STANDARD\nHADR local host name                  (HADR_LOCAL_HOST) = aux2-east.xxx.net\nHADR local service name                (HADR_LOCAL_SVC) = 50053\nHADR remote host name                (HADR_REMOTE_HOST) = dbpp.xxx.net\nHADR remote service name              (HADR_REMOTE_SVC) = 50050\nHADR instance name of remote server  (HADR_REMOTE_INST) = db2inst1\nHADR timeout value                       (HADR_TIMEOUT) = 120\nHADR target list                     (HADR_TARGET_LIST) = dbpp.xxx.net:50050|dbps.xxx.net:50051|aux1-east.xxx.net-01:50052\nHADR log write synchronization mode     (HADR_SYNCMODE) = SUPERASYNC\nHADR spool log data limit (4KB)      (HADR_SPOOL_LIMIT) = 100000\nHADR log replay delay (seconds)     (HADR_REPLAY_DELAY) = 0\nHADR peer window duration (seconds)  (HADR_PEER_WINDOW) = 120\n<\/code><\/pre>\n\n\n
For the principal standby (dbps.xxx.net):<\/p>\n\n\n
[db2inst1@dbps.xxx.net]$ db2 get db cfg for sample | grep -i hadr\nHADR database role                                      = STANDBY\nHADR local host name                  (HADR_LOCAL_HOST) = dbps.xxx.net\nHADR local service name                (HADR_LOCAL_SVC) = 50051\nHADR remote host name                (HADR_REMOTE_HOST) = dbpp.xxx.net\nHADR remote service name              (HADR_REMOTE_SVC) = 50050\nHADR instance name of remote server  (HADR_REMOTE_INST) = db2inst1\nHADR timeout value                       (HADR_TIMEOUT) = 120\nHADR target list                     (HADR_TARGET_LIST) = dbpp.xxx.net:50050|aux1-east.xxx.net-01:50052|aux2-east.xxx.net:50053\nHADR log write synchronization mode     (HADR_SYNCMODE) = NEARSYNC\nHADR spool log data limit (4KB)      (HADR_SPOOL_LIMIT) = 100000\nHADR log replay delay (seconds)     (HADR_REPLAY_DELAY) = 0\nHADR peer window duration (seconds)  (HADR_PEER_WINDOW) = 300\n<\/code><\/pre>\n\n\n
For the primary server (dbpp.xxx.net):<\/p>\n\n\n
[db2inst1@dbpp.xxx.net]$ db2 get db cfg for sample |grep -i hadr\nHADR database role                                      = PRIMARY\nHADR local host name                  (HADR_LOCAL_HOST) = dbpp.xxx.net\nHADR local service name                (HADR_LOCAL_SVC) = 50050\nHADR remote host name                (HADR_REMOTE_HOST) = dbps.xxx.net\nHADR remote service name              (HADR_REMOTE_SVC) = 50051\nHADR instance name of remote server  (HADR_REMOTE_INST) = db2inst1\nHADR timeout value                       (HADR_TIMEOUT) = 120\nHADR target list                     (HADR_TARGET_LIST) = dbps.xxx.net:50051|aux1-east.xxx.net:50052|aux2-east.xxx.net\nHADR log write synchronization mode     (HADR_SYNCMODE) = NEARSYNC\nHADR spool log data limit (4KB)      (HADR_SPOOL_LIMIT) = 100000\nHADR log replay delay (seconds)     (HADR_REPLAY_DELAY) = 0\nHADR peer window duration (seconds)  (HADR_PEER_WINDOW) = 300\n<\/code><\/pre>\n\n\n
That’s it. The process to start HADR is the same. Issue this command on the aux2-east; aux1-east and dbps.xxx.net:<\/p>\n\n\n
[db2inst1 ~]$ db2 start hadr on db sample as standby<\/code><\/p>\n\n\n
Here is an example:<\/p>\n\n\n
[db2inst1 ~]$ db2 deactivate db sample\nDB20000I  The DEACTIVATE DATABASE command completed successfully.\n\n[db2inst1 ~]$ db2 start hadr on db sample as standby\nDB20000I  The START HADR ON DATABASE command completed successfully.\n<\/code><\/pre>\n\n\n
Then start HADR on primary using this command:<\/p>\n\n\n
[db2inst1 ~]$ db2 start hadr on db sample as primary<\/code><\/p>\n\n\n
Once this is done, you can monitor the HADR_STATE from the primary to watch as all three standby copies connect to the primary and start receiving logs. The principal standby would reach a PEER state once caught up. Both the auxiliary standbys will always show a REMOTE_CATCHUP HADR_STATE.<\/p>\n","protected":false},"excerpt":{"rendered":"
In my previous blog, I presented some of the issues you can run into when setting up one auxiliary HADR standby and a potential solution. This blog discusses setting up two auxiliary standby databases in detail. Let’s start with all the information we need to set the configuration parameters: Host Info: Primary: dbpp.xxx.net Principal standby: […]<\/p>\n","protected":false},"author":3,"featured_media":37070,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","content-type":"","footnotes":""},"categories":[4166,17],"tags":[4041,4156,4042,3930],"class_list":["post-37064","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-db2","tag-auxiliary-standbys","tag-db2-high-availability","tag-disaster-recovery","tag-hadr"],"yoast_head":"\nSetting Up HADR with Two Auxiliary Standbys<\/title>\n<meta name=\"description\" content=\"This blog discusses how to set up HADR in Db2 with two auxiliary standby databases in detail.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/virtual-dba.com\/blog\/setting-up-hadr-with-two-auxiliary-standbys\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Setting Up HADR with Two Auxiliary Standbys\" \/>\n<meta property=\"og:description\" content=\"This blog discusses how to set up HADR in Db2 with two auxiliary standby databases in detail.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/virtual-dba.com\/blog\/setting-up-hadr-with-two-auxiliary-standbys\/\" \/>\n<meta property=\"og:site_name\" content=\"Virtual-DBA Remote DBA Services & Support - 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