Hi, sorry for intervening, but please try the first also with -fsync=1,
NVMes sometimes ignore -sync=1 (Bluestore uses fsync).
the Samsung PM1725b is definitely a good choice when it comes to "lower"
price enterprise SSDs. They cost pretty much the same as the Samsung Pro
SSDs but offer way higher DWPD and power loss protection.
My benchmarks of the 3.2TB version in a PCIe 2.0 slot (the card is 3.0!)
fio --filename=/dev/nvme0n1 --direct=1 --sync=1 --rw=write --bs=4k
--numjobs=10 --iodepth=1 --runtime=60 --time_based --group_reporting
--name=journal-test
write: IOPS=154k, BW=601MiB/s (630MB/s)(35.2GiB/60003msec)
fio --filename=/dev/nvme0n1 --direct=1 --sync=1 --rw=write --bs=4M
--numjobs=5 --iodepth=1 --runtime=60 --time_based --group_reporting
--name=journal-test
write: IOPS=679, BW=2717MiB/s (2849MB/s)(159GiB/60005msec)
--
With best regards,
Vitaliy Filippov
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