Nenad,
I have Azure customers using Pacemaker/Corosync (PCS) HA clusters on
Linux (i.e. SUSE, RHEL, OEL) for Oracle databases in Azure. Out of the
box, PCS supports other databases such as MySQL, SAP HANA, SAP ASE
(Sybase), IBM DB2 LUW, etc; pretty much anything.
PCS is the open-source descendent of the older proprietary-UNIX HA
clustering packages such as IBM HACMP on AIX, HP ServiceGuard on HP-UX,
Sun HA on Solaris, and Veritas Clustering on several OS platforms. So,
the reason people used those proprietary HA clustering technologies is
likely the reasons PCS is used with Linux today?
As for my Azure customers, they prefer the same HA clustering method
across all applications and databases, which is not an unusual viewpoint
when HA and DR are the responsibility of the infrastructure team, as
opposed to being the responsibility of each of the database/application
administration teams. For Oracle-based applications with RPO=0 and RTO
< 30 seconds, DataGuard is the preference for its disaster resilience
across geographies and its support for true "rolling upgrades" of
database changes using DBMS_ROLLING. Some customers claim that
DataGuard is "too expensive" because it requires double the storage, but
that view quickly fades when compared to the additional US$23000/core
licensing and US$5060/core support fees for RAC.
With Oracle's power play of not supporting RAC on non-Oracle clouds,
people are increasingly recognizing RAC as an overly expensive one-trick
pony for HA.
Hope this helps,
-Tim
On 5/17/2021 9:45 AM, Noveljic Nenad wrote:
Does anyone use OS cluster for failing over Linux VMs with Oracle databases to another node?
If so:
1. What were your reasons against Oracle Clusterware?
2. What cluster/Linux variant do you use?
Best regards,
Nenad
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