Re: Linux VM Failover

I put together a cluster using corosync, pacemakener, and drbd. It was primarily as an experiment, I cant vouch for how well it would work on a production load:

https://dbakerber.wordpress.com/2019/03/15/oracle-cluster-with-drbd-pacemaker-and-corosync/

On Mon, May 17, 2021 at 1:11 PM Tim Gorman <tim.evdbt_at_gmail.com> wrote:

> 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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