BlueStore WAL or DB devices on a distant SSD ?

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Hi,

We are currently running two Proxmox/ceph clusters that work perfectly (since 2014) and thank to this succesful experience, we plan to install a new Ceph cluster for storage of our computing cluster.

Until now, we only used RBD (virtualization context) but now we want to use CephFS for this new cluster (separated from the other two, hardware is different and dedicated for this new clusters).

I'm interested in testing a CephFS cluster with BlueStore as a backend storage.

I have several OSDs servers (with a dozen SATA HDDs on each) but some do not have an additional SSD disk (only 3 of the servers have an additional SSD).

My question is about BlueStore WAL/DB devices. When I read the documentation, it seems that adding both WAL and DB devices improve BlueStore performances.

But, can we configure these devices on a distant SSD (I mean on a SSD which is not on the local OSDs server but on an another machine which is on the same Ceph cluster) ?

If yes, can I configure mulitple WAL or DB devices on the same SSD ?

And finally, is it relevant to do that (I mean in term of performance) ?

Hoping to have been clear on my context, thanks in advance for your reply or your reflection.

Regards,

Hervé


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