How does the kernel determine if a SCSI disk is HDD (rotational) or SSD (non-rotational)?

Solution Verified - Updated -

Issue

  • SSD drives have the rotational value within sysfs set to 1 versus the expected 0.

    # grep -Hv "zz" /sys/block/sd*/queue/rotational
/sys/block/sda/queue/rotational:1
/sys/block/sdb/queue/rotational:1
/sys/block/sdc/queue/rotational:1

  • Is there a way to force the disk to be set to SSD vs HDD?

Environment

  • Red Hat Enterprise Linux

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