SAP ECC DR - Best practices

[Former Member]

Hello,

   I'm seeking information about Best Practices for DR.

We have Production site and DR site. Between these two sites persists Layer 3 network.

In Production site I'm planning to have 2x IBM Power servers - for Production SAP instances Provide Local Cluster (using PowerHA) for High Critical SAP instances, standalone LPARs for Medium Critical SAP instances. 2x boxes will be used also and for planned maintenance physical server maintenance (all LPARs will be migrated using Live Migration feature).

In DR site we're planning to have single Power server - on this server will run DEV/TST/QA environments. In case of Disaster, all DEV/TST/QA LPARs will shutdowned (or reduced resourced) , and all Production LPARs will be restored on this singlle box.

DRP: All Prodcution LUNs data (including rootvg, application and oracle data) will be replicated from Production site to DR site using EMC SRDF/S feature. LPARs will be restored by engineers, they also will change IP addresses (in DR site will be different subnet).

I would like ask you what are best practices for such scenario? I would also ask about users access ? E.g. do we need to use Network Load balancers? Or might be we can use DNS SRV records:

  Primary IP -> Production site's IP

  Secondary IP -> DR site's IP
Also it might be sufficient DNS A records with short TTL (e.g. 15 mins). So will not be a any cache, if engineer changes IP address of a hostname, users will refresh in 15 mins.

Are there any constraints, SAP GUI support SRV records? Any recommendations / advices?
Thank you

[Former Member]

What is edition of PowerHA?

[Former Member]

Hi Roman,

  It's not decided yet. We are still working on that. You are advicing regarding GEO Cluster?

Thanks

/G

[Former Member]

Giedrius Augys wrote:

You are advicing regarding GEO Cluster?

It is your requirements (as of your first mesage). First check hardware/technology (SAN replication) support with PowerHA Enterprise Edition.

[former_member188883]

Hi Giedrius,

As a best practise it good to have same hostname, instance no on DR site as well.

When switching to DR , there won't be much changes in the connected systems as well as user front end need not be updated.

You just need to ensure DNS entries are updated on DR during the switch.

Change in IP address will not be an issue unless in RFCs if you use IP address instead of hostname.

Hope this helps.

Regards,

Deepak Kori