Re: Data Replication

Hi, Please correct me if I am wrong, > When you take down the primary server and want to make the secondary server > standard, it is possible. Here is how you do it. > 1. Take your primary down. > 2. Secondary recieves a DR Error, but stays on-line. This will be in Recovery mode when primary will be down. > 3. On secondary, Issue 'onmode -d primary <old primary server name>' Secondary will be in ONLINE MODE. > 4. Secondary becomes primary, tries to connect to secondary, fails > but becomes primary. > 5. Now change the mode to standard, 'onmode -d standard'. > That would work in both 7.11UC1 and 7.12UC1. But here are the problems > associated with it. > 1. Once you make one of the servers standard, DR is lost. And if the > logical logs roll over, you would have start from scratch and redo > the DR method. > 2. You would have to implement the client redirection methods to goto > the secondary and if you have redo the DR, possibly there would be > some downtime involved. >I did not know why you want to make the secondary standard. We were doing testing, that, If primary server fails for a long time, then Secondary will become standard (Read/Write) server. >But here is my suggetion > 1. If primary is going to be down short amount of time, do not do anything > but bring the primary up. > 2. If primary is down long, make secondary primary (as explained above) > and keep it primary. This is assuming you have the clients redirected > to seconadary server which you would have to do anyway. By this way > ***whenever the primary comes up it automatically changes itself to > secondary *** and stays as secondary. Repeat the procedure if needed. This is not clear to me. When primary comes up, How it automatically changes to secondary ? We have not given the command "onmode -d secondary (old secondary server name)" and DRAUTO = 0 in our case. So when should I issue this command, to make it seconadary ? I suppose when it in quiescent mode I can issue this command. But then What should I do if I want original Seconadry as Secondary server and Original primary as Primary server ? > 3. The advantage of above scheme is you do not have to redirect your > clients twice. > One more caution. Do back up your logical logs to tape/disk. Do not make > LTAPEDEV to /dev/null.Yes, We are using continuous backup for Logical Logs. Thank you very much for your input. Regards, priti pjhaveri@treas02.attmail.com *************************************************************************