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* IOPS difference between RAID and HBA/SATA may be very noticeable. A bad or old RAID controller can easily become a bottleneck.
* HBAs also have IOPS limits. For example, it’s ~280000 iops for all disks for the LSI 9211-8i.
* Always turn on blk-mq on for SAS and NVMe — NVMe drives — or just use recent kernel versions, blk-mq is on by default since 4.18 or so. However, blk-mq does almost nothing for For SATAit’s not required.
== CPUs ==