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IDS Forum

Re: HDR scenarios

Posted By: BENJAMIN THOMPSON
Date: Tuesday, 31 October 2017, at 8:04 a.m.

In Response To: HDR scenarios (MUKESH TANUKU)

1. How to take dbexport backup whit the HDR pair with no down time.

This was been discussed before:
http://members.iiug.org/forums/ids/index.cgi/read/21903

In short, I would not use dbexport: use ontape or onbar with PSM which do not require downtime.

2. How to manually restart the server without changing the HDR pair server types. EX: Prim/sec

If you have CM in auto-failover mode you either:
a) stop all CMs before restarting.
b) ensure you stop/start in the correct sequence which is to shut down all secondaries that your policy permits failover before stopping the primary and then restart the primary first.

3.How to make old primary server back to Primary again.

http://www-01.ibm.com/support/docview.wss?uid=swg21220123

4. What is the chance of data loss when fail over happens.

If you run HDR in near-sync mode a transaction is not committed until it has been transmitted to the secondary so you could only lose uncommitted transactions. Alternatively you can go full sync but this means the primary always waits for the HDR to commit.

https://www.ibm.com/support/knowledgecenter/en/SSGU8G_12.1.0/com.ibm.admin.doc/ids_admin_1417.htm

5. How to reestablish the HDR pair again once the fail-over happens without data loss.

This depends on whether the logical logs have wrapped around or not. It's easiest to avoid this by calculating how many logs you're likely to need to survive for whatever time you deem necessary. If logs have wrapped around you will need to rebuild the HDR from backup, either ifxclone or onbar/ontape, or apply logical log backups if you have them.

Ben.

Messages In This Thread

  • HDR scenarios
    MUKESH TANUKU -- Monday, 30 October 2017, at 7:28 a.m.
    • Re: HDR scenarios
      BENJAMIN THOMPSON -- Tuesday, 31 October 2017, at 8:04 a.m.

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