99.99% availabilty

[Former Member]

Hi,

Do you have any ideas to achieve 99.99% availability of SAP R/3 running on Windows SQL environment.

Any case study would really help.

I have gone throught the HA guide of SAP, but it doesn't help beyond a general information.

Thanks,

Sankar

[Benny]

Hi Sankar,

we have extensive manuals on this and an installation instruction for MSCS. What do you miss there?

Regards,

Benny

[Former Member]

Hi Benny,

None of the manuals talk about 99.99% availability. AFAIK even SAP Hosting provides only 99.5% availability. I am very meticulous about 4 nines (i.e.99.99)

This means the system can down only for 53 minutes in a year.

Even with MSCS I have no clue on how I will do my support pack application. Upgrade, Security patches etc which mandates a down time/ system reboot.

Also I need some clarity on enqueue replication on MSCS too.

Can you please let me know some documents which shows the architecture for the said landscape?

Thanks,

Sankar

[Benny]

Sankar,

99.99 is quite tough, especially with SAP systems. If you can do this, really depends on your system. As you know yourself, the upgrades are the real problem, because your data defines the time which is needed to upgrade.

For more information I recommend http://service.sap.com/ha . There you can find lots of information. Especially the Switchover Guide, which explains how such environments work. For MSCS there is a clear installation instruction.

Please see also note 804078 and 803018 concerning HA.

ENQ replication should now run on Windows too.

If you have more questions, don't hesitate to ask.

Regards,

Benny

[former_member110461]

We've achieved it at some of our clients. Cluster the DB & CI and run online backups. Make sure you have lots of transaction log backups so that the trans log doesn't get full. Then you're pretty much sorted from the hardware / SQL side.

One thing to watch out for though - Support packages / SP-stacks. These need to be applied, particularly if you're running HR (else you don't have up to date tax laws in your system). Although you don't need to take the system down for them, it is advised to avoid having no or very few users logged on the system at the time off application.

Paul

[Former Member]

Thanks Paul, Would you be able to share with me the architecture of those landscapes.

Yes, SPs and upgrades are my concerns, also the security patches.

Thanks,

Sankar