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by justincormack
4143 days ago
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The main thing is to make sure that there are a lot of commands in the queue, then the drive can take care of most things. SATA has a queue depth of around 32, NVMe much more. If you benchmark (eg with fio) you will see that you get nothing like the rated iops at low queue depths. Getting enough stuff queued is quite hard - fio is useful to test as it gives multiple strategies but you need quite a lot of threads in a real application, or use Linux aio with O_DIRECT. |
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