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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