What's the right way to measure latency?

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I'm trying to measure latency.  Is this the right incantation for "8KB
block write latency"?

fio --name=test --numjobs=1 --bs=8k --rw=randwrite --sync=0 --direct=1
--iodepth=1 --ioengine=libaio --loops=1 --size=16091503001
--filename=/dev/sdb

... I figure I can only measure latency w/ just one thread and no
outstanding I/O's.

The results show two latency numbers: clat and slat... what are these?

Thanks,

Chris
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