| SAPHanaSR-angi-scenarios(7) | SAPHanaSR-angi | SAPHanaSR-angi-scenarios(7) |
NAME¶
SAPHanaSR-angi-scenarios - SAP HANA system replication scenarios.
DESCRIPTION¶
SAPHanaSR-angi covers two topologies, scale-up and scale-out. On each topology, several scenarios are supported. Finally, for most scenarios, two variants are possible.
* Scenarios overview
The table shows the known SAPHanaSR-angi HA scenarios for HANA system replication for the two HANA topologies. The current support status is also shown.
| Topology | Scenario | Status |
| Scale-Up | perf-opt | Supported |
| perf-opt, 2nd site read-enabled | ||
| perf-opt, multi-target, 3rd site outside cluster | ||
| perf-opt, multi-SID | Undocumented | |
| perf-opt, w. S/4 ENSA2 in same cluster | ||
| cost-opt | ||
| cost-opt, multi-target | ||
| perf-opt, multi-target, 3rd site inside cluster | Non-supported | |
| two perf-opt clusters connected | ||
| Scale-Out | perf-opt, up to 12 nodes, no standby (BW) | Supported |
| perf-opt, 4 nodes, 2nd site read-enabled (ERP) | ||
| perf-opt, multi-target, 3rd site outside cluster | ||
| perf-opt, up to 30 nodes w. standby (BW) | Undocumented | |
| perf-opt, multi-target, 3rd site inside cluster | Non-supported | |
| perf-opt, multi-SID | ||
| cost-opt | ||
| two perf-opt clusters connected |
Supported - the scenario is known to work for the given topology. The setup has been tested and is documented in a setup guide. It is supported by SUSE.
Undocumented - the scenario is expected to work for the given topology. The setup is currently not documented in a setup guide. SUSE services are prepared to help with implementation. Once the setutp is working, it could be supported by SUSE.
Non-supported - the scenario is expected not to work. It is not supported by SUSE.
For details on requirements and configuration of the scenarios, please refer to manual pages SAPHanaSR-angi(7), SAPHanaSR(7) and SAPHanaSR-ScaleOut(7), as well as the respective setup guides.
* Scenario notation
It might help to describe scenarios in a pseudo-visualising notation.
| Symbol | Meaning |
| [ ] | Linux cluster |
| A B C | master nameserver node |
| a b c | worker node |
| _ | standby node |
| => | synchronous replication |
| -> | asynchronous replication |
| IP address | |
| " | secondary (read-enabled) IP address |
The scale-up performance-optimised multi-target scenario can be
noted as:
[ A' => B ] -> C
* Variants overview
SAPHanaSR-angi allows to define different variants of reaction on failures.
Conservative – default configuration
The cluster is patient, it prefers stopping HANA over fencing nodes. It does
not react on filesystem failures.
Progressive – alternative configuration
The cluster reacts on failures of HANA or filesystem with fencing all nodes of
the affected site. Takeover time might be further reduced by using diskless
SBD.
For details on configuration of the variants, please refer to manual pages ocf_suse_SAPHanaController(7), ocf_suse_SAPHana(7), ocf_suse_SAPHanaFilesystem(7), SAPHanaSR-alert-fencing(8), susChkSrv.py(7), SAPHanaSR_basic_cluster(7), SAPHanaSR-ScaleOut_basic_cluster(7).
EXAMPLES¶
* Examples for supported scenarios
- Scale-up performance-optimised multi-target
- [ A' => B ] -> C
- Scale-up cost-optimised
- [ A' => B,Q ]
- Scale-out performance-optimised multi-target read-enabled (ERP)
- [ 'Aa => "Bb ] -> Cc -> Dd
- Scale-out performance-optimised, each site 8-node w. standby (BW)
- [ 'Aaaaaaa_ => Bbbbbbb_ ]
* Examples for non-supported scenarios
- Scale-up performance-optimised multi-target 3rd site in cluster
- [ A' => B => C ]
- Scale-out performance-optimised two clusters connected
- [ 'Aa => Bb ] -> [ 'Cc => Dd ]
BUGS¶
In case of any problem, please use your favourite SAP support process to open a request for the component BC-OP-LNX-SUSE. Please report any other feedback and suggestions to feedback@suse.com.
SEE ALSO¶
SAPHanaSR-angi(7) , SAPHanaSR(7) ,
SAPHanaSR-ScaleOut(7) , ocf_suse_SAPHanaController(7) ,
ocf_suse_SAPHana(7) , ocf_suse_SAPHanaFilesystem(7) ,
SAPHanaSR-alert-fencing(8) , susChkSrv.py(7) ,
SAPHanaSR_basic_cluster(7) ,
SAPHanaSR-ScaleOut_basic_cluster(7) ,
https://documentation.suse.com/sles-sap/sap-ha-support/html/sap-ha-support/article-sap-ha-support.html
,
https://documentation.suse.com/sbp/sap-15/
AUTHORS¶
A.Briel, F.Herschel, L.Pinne.
COPYRIGHT¶
(c) 2024 SUSE LLC
The package SAPHanaSR-angi comes with ABSOLUTELY NO WARRANTY.
For details see the GNU General Public License at
http://www.gnu.org/licenses/gpl.html
| 05 Nov 2024 |