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* In theory, you may try to leverage the battery- (or supercap-) backed controller cache in RAID0 mode to improve write latency. However, that can easily become shooting yourself. At least conduct some power-unplug tests if you do that.
* 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 the whole controller all disks for the LSI 9211-8i.
* Always turn on blk-mq for SAS and NVMe — or just use recent kernel versions, blk-mq is on by default since 4.18 or so. However, blk-mq does almost nothing for SATA.
