Tests i proposed are in line with dd tests he performed (sequential write).
While I'm writing this, here is an example or more "realistic" test of random write and read (25% write 75% read):
fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=brisi --bs=4k --iodepth=64 --size=8G --readwrite=randrw --rwmixread=75
While I'm writing this, here is an example or more "realistic" test of random write and read (25% write 75% read):
fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=brisi --bs=4k --iodepth=64 --size=8G --readwrite=randrw --rwmixread=75