Hi Tim,
Thank you for this information.
How do your customers who use PCS replicate data for DR: ASM mirroring or some
storage/OS replication feature?
Do your customers configure MAX PROTECTION mode to satisfy the RPO=0
requirement with data guard?
Have you considered using Clusterware without RAC with the ASM mirroring for
DR/HA purposes?
Best regards,
Nenad
From: Tim Gorman <tim.evdbt@xxxxxxxxx>
Sent: Montag, 17. Mai 2021 20:11
To: Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>; ORACLE-L
(oracle-l@xxxxxxxxxxxxx) <oracle-l@xxxxxxxxxxxxx>
Subject: Re: Linux VM Failover
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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