Hi Diego. In our setup, the database is critical. We have some wrapper scripts that consult the database for information, and we also set environment variables on login, based on user/partition associations. If the database is down, none of those things work. I doubt there is appetite in the organization to change the way our setup works, but if we can improve database reliability, that would be a good solution. Mostly I am interested in protecting from hardware failure, and that’s why I’m interested in a cluster solution such as XtraDB. Thanks. Daniel

On Jan 23, 2024, at 03:23, Diego Zuccato <diego.zuccato@unibo.it> wrote:

IIUC the database is not "critical": if it goes down, you lose access to some statistics. But job data gets cached anyway and the db will be updated when it comes back online.

Diego

Il 22/01/2024 18:23, Daniel L'Hommedieu ha scritto:

...

Community: What do you do to ensure database reliability in your SLURM environment? We can have multiple controllers and multiple slurmdbds, but my understanding is that slurmdbd can be configured with a single MySQL server, so what do you do? Do you have that “single MySQL server” be a cluster, such as Percona XtraDB? Do you use MySQL replication, then manually switch to slurmdbd to a replication slave if the master goes down? Do you do something else? Thanks. Daniel

-- Diego Zuccato DIFA - Dip. di Fisica e Astronomia Servizi Informatici Alma Mater Studiorum - Università di Bologna V.le Berti-Pichat 6/2 - 40127 Bologna - Italy tel.: +39 051 20 95786

Xand, Thanks - that’s great to hear. I was thinking of using Anycast to achieve the same thing, but good to know that keepalived is a viable solution as well. Best, Daniel

On Jan 23, 2024, at 09:29, Xand Meaden <xand.meaden@kcl.ac.uk> wrote:

Hi,

We are using Percona XtraDB cluster to achieve HA for our Slurm databases. There is a single virtual IP that will be kept on one of the cluster's servers using keepalived.

Regards, Xand From: slurm-users <slurm-users-bounces@lists.schedmd.com <mailto:slurm-users-bounces@lists.schedmd.com>> on behalf of Daniel L'Hommedieu <dlhommedieu@gmail.com <mailto:dlhommedieu@gmail.com>> Sent: 22 January 2024 17:23 To: Slurm User Community List <slurm-users@lists.schedmd.com <mailto:slurm-users@lists.schedmd.com>> Subject: [slurm-users] Database cluster

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Community:

What do you do to ensure database reliability in your SLURM environment? We can have multiple controllers and multiple slurmdbds, but my understanding is that slurmdbd can be configured with a single MySQL server, so what do you do? Do you have that “single MySQL server” be a cluster, such as Percona XtraDB? Do you use MySQL replication, then manually switch to slurmdbd to a replication slave if the master goes down? Do you do something else?

Thanks.

Daniel