For Proxmox and Ceph, which IO Scheduler is optimum?

[mfa2004]

When running a PROXMOX 6.1 cluster with Ceph OSDs, what is the recommended IO Scheduler for the OSD drives? By default, it is mq-deadline right now, but will there be a benefit to change it to BFQ? Has anyone done a benchmark?

Thanks in advance.

 

[Alwin]

The general answer, this will depend on your setup. With FIO or the rados bench, you can test the different schedulers with the load patters your workload will do. An OSD is usually the only application per disk. AFAIR, the OSD has by default two worker rotating on read / writes.

 

[chrcoluk]

Looks like BFQ is not available on proxmox, the module is missing (is in standard debian distro).

Which is a shame as its a good scheduler for spindles.

 

[tom]

Looks like BFQ is not available on proxmox, the module is missing (is in standard debian distro).

Which is a shame as its a good scheduler for spindles.

Please provides benchmarks showing that BFQ is a win for OSDs.

 

[chrcoluk]

I got no benchmarks, I just tested on live load, which is more important to me vs benchmarking, I can run a benchmark if you have one to suggest though.

I need to apologise, the module is there, I was looking in the wrong path.

 

[Alwin]

I got no benchmarks, I just tested on live load, which is more important to me vs benchmarking, I can run a benchmark if you have one to suggest though.

Have a look here.
https://proxmox.com/en/downloads/item/proxmox-ve-ceph-benchmark