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тАО07-30-2003 12:22 PM
тАО07-30-2003 12:22 PM
Here is a little explanation of a possible environment we are considering.
System 1 primary DB server running SAP with an Oracle DB. Database size 200 GB and growing.
Disk Subsystem allowing for shared storage.
System 2 backup DB server, however running as a SAP application server when the primary system is active. System #2 has the same # cpu's and same amount of memory as system 1.
Knowing that in the event of failover, System 2 must shutdown the application it is running, then the cluster will switch the packages over to system 2. There will also be a nfs package to failover.
In your expierence how long does it take to finish this entire process of detecting the failure, stopping the app on system 2, moving the volumes and packages, and recovering the Orcale DB, and starting SAP?
Solved! Go to Solution.
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тАО07-30-2003 12:53 PM
тАО07-30-2003 12:53 PM
Re: MC/Service Guard Questions
By the time Oracle has recovered, your NFS package will have long been up.
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тАО07-30-2003 04:53 PM
тАО07-30-2003 04:53 PM
Re: MC/Service Guard Questions
regards
mB
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тАО07-30-2003 10:38 PM
тАО07-30-2003 10:38 PM
Re: MC/Service Guard Questions
maybe i'm a little unfortunate, but my switchover take about 10/15 minutes.
A clean and alone SAP takes about 5 minutes, including automatic recover from oracle, cleaning of SAP application server and new start. We never use the reconnect feature, that can help in minimizing this time, but we prefer a total shutdown and a clean startup in such cases.
Usually we have a lot of stuff togheter with SAP in HA: MQ series, Autosys, NFS package exporting sap nfs relates fs and some other apps fs. If you count 3/4 minutes for each, time is in line with others.
Massimo
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тАО07-30-2003 10:51 PM
тАО07-30-2003 10:51 PM
Re: MC/Service Guard Questions
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тАО07-31-2003 04:22 AM
тАО07-31-2003 04:22 AM
Re: MC/Service Guard Questions
For those who replied two minutes how large is your Oracle Database?
Do you have a application that must be stoped on system 2?
Do you add extra resources ( memory ) to make sure the package has enough resources to start on system 2 without shutting down the application that normally runs on system 2?
Also is 2 min. when you do a manual move? Have you had a crash or tested the failover during a heavy load?
I know that if you plan the outage and shutdown the applications then move the package the 'failover' can be quicker.
I think the variable for a live system crash is how many users where working when the crash occurs and what they were doing. How much does Oracle have to roll back?
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тАО07-31-2003 04:51 AM
тАО07-31-2003 04:51 AM
SolutionOur System #1 does run our DB for SAP, and System #2 runs the CI for SAP and App_server #1. Whenever there is a failover, App_server #1 shuts down and the DB transfers over.
When Service Guard was implemented at our site, everything was made part of the Service Guard scripts. Actually if I'm not mistaken, not much customization was done as we both the latest MC/SG and SAP extension for MC/SG.
All in all, it does take about 20 minutes for the whole thing to failover. Granted, we haven't had a real catastrophe during peak hours for a very long time (especially since we actually implemented the new version about 1 1/2 year ago), but all tests, even crash tests (not manual failover) were all about 20 minutes and that included App_Server #1 shutting down.