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Hi, after reading a lot about I/O schedulers and performance gains with blk-mq, I switched to a custom 4.14.5 kernel with CONFIG_SCSI_MQ_DEFAULT enabled to have blk-mq for all devices on my cluster. This allows me to use the following schedulers for HDDs and SSDs: mq-deadline, kyber, bfq, none I’ve currently set the HDD scheduler to bfq and the SSD scheduler to none, however I’m still not sure if this is the best solution performance-wise. Does anyone have more experience with this and can maybe give me a recommendation? I’m not even sure if blk-mq is a good idea for ceph, since I haven’t really found anything on the topic. Best, Patrick |
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