Linux -LMV DM devices IOPS count

Solution 1:

The LVM devices starting with DM are an abstraction on top of the disk device.

The disk device is /dev/sda.

Your vendor offered IOPS values for the disk itself.

You probably should measure the performance of /dev/sda if you want to evaluate the claims of the vendor.

Note that the "average" I/O performance is unlikely to closely approach the peak rate unless your disk usage is consistent and saturated, at which point your experience of the performance of the system is unlikely to be positive (it implies that some process is waiting for I/O literally all_the_time.).