Hi,
I use fio 3.19 to test NvmeSSD，cmd string is：
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fio --filename=/dev/nvme0n1 --rw=randwrite --offset=0 --size=10%
--bs=128k --iodepth=64 --numjobs=1 --ioengine=libaio
--name=randwrite_data --allow_file_create=0 --thread --direct=1
--group_reporting=1 --verify_dump=1 --verify_backlog=1 --randrepeat=0
--do_verify=1 --verify=pattern --verify_pattern=0x51d4b0e0
--bssplit=512:4k:16k:32k:64k:128k:1024k
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Then a verify error occurs,
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randwrite_data: (g=0): rw=randwrite, bs=(R) 512B-1024KiB, (W)
512B-1024KiB, (T) 512B-1024KiB, ioengine=libaio, iodepth=64
fio-3.19
Starting 1 thread
fio: got pattern '00', wanted '51'. Bad bits 3
fio: bad pattern block offset 384
pattern: verify failed at file /dev/nvme0n1 offset 70523721971, length
3769685073 (requested block: offset=68822685696, length=1048576)
received data dumped as nvme0n1.69899573248.received
expected data dumped as nvme0n1.69899573248.expected
fio: verify type mismatch (57520 media, 18 given)
randwrite_data: (groupid=0, jobs=1): err= 0: pid=2990: Thu Sep 1 14:10:23 2022
read: IOPS=167M, BW=8943GiB/s (9602GB/s)(89.4GiB/10msec)
slat (nsec): min=559, max=21279, avg=1135.63, stdev=853.10
clat (usec): min=13, max=51046, avg=3229.89, stdev=3195.51
lat (usec): min=14, max=51053, avg=3231.04, stdev=3196.01
clat percentiles (usec):
| 1.00th=[ 217], 5.00th=[ 545], 10.00th=[ 857], 20.00th=[ 1369],
| 30.00th=[ 1795], 40.00th=[ 2147], 50.00th=[ 2474], 60.00th=[ 2802],
| 70.00th=[ 3228], 80.00th=[ 4080], 90.00th=[ 6128], 95.00th=[ 8848],
| 99.00th=[17171], 99.50th=[21627], 99.90th=[30278], 99.95th=[33162],
| 99.99th=[38536]
write: IOPS=12.7k, BW=698MiB/s (732MB/s)(89.4GiB/131206msec); 0 zone resets
slat (nsec): min=639, max=36626, avg=1299.14, stdev=901.82
clat (usec): min=8, max=31311, avg=1797.57, stdev=1917.38
lat (usec): min=9, max=31312, avg=1798.89, stdev=1917.58
clat percentiles (usec):
| 1.00th=[ 16], 5.00th=[ 27], 10.00th=[ 42], 20.00th=[ 108],
| 30.00th=[ 334], 40.00th=[ 824], 50.00th=[ 1369], 60.00th=[ 1909],
| 70.00th=[ 2409], 80.00th=[ 3064], 90.00th=[ 4146], 95.00th=[ 5276],
| 99.00th=[ 8586], 99.50th=[10159], 99.90th=[13960], 99.95th=[15533],
| 99.99th=[18744]
bw ( KiB/s): min=497348, max=1063791, per=100.00%, avg=715944.11,
stdev=115634.92, samples=261
iops : min= 4238, max=18726, avg=12722.05, stdev=4574.05, samples=261
lat (usec) : 10=0.01%, 20=1.23%, 50=4.85%, 100=3.68%, 250=4.70%
lat (usec) : 500=4.63%, 750=4.35%, 1000=4.44%
lat (msec) : 2=20.84%, 4=35.50%, 10=13.53%, 20=1.91%, 50=0.32%
lat (msec) : 100=0.01%
cpu : usr=5.62%, sys=3.29%, ctx=2799800, majf=0, minf=266
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=0.1%, >=64=100.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.1%, >=64=0.0%
issued rwts: total=1668079,1668079,0,0 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=64
Run status group 0 (all jobs):
READ: bw=8943GiB/s (9602GB/s), 8943GiB/s-8943GiB/s
(9602GB/s-9602GB/s), io=89.4GiB (96.0GB), run=10-10msec
WRITE: bw=698MiB/s (732MB/s), 698MiB/s-698MiB/s (732MB/s-732MB/s),
io=89.4GiB (96.0GB), run=131206-131206msec
Disk stats (read/write):
nvme0n1: ios=1772035/1772257, merge=0/0, ticks=6269444/3172530,
in_queue=9441974, util=100.00%
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fio: got pattern '00', wanted '51'. Bad bits 3
fio: bad pattern block offset 384
pattern: verify failed at file /dev/nvme0n1 offset 70523721971, length
3769685073 (requested block: offset=68822685696, length=1048576)
received data dumped as nvme0n1.69899573248.received
expected data dumped as nvme0n1.69899573248.expected
fio: verify type mismatch (57520 media, 18 given)
"offset 384", "offset 70523721971, length 3769685073",
"offset=68822685696, length=1048576", "nvme0n1.69899573248.received"
These number has no any relation, like equal or sum equl. Maybe this
is an error or mistake??
