verify seems not to take place on iSCSI-Target writing

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Hi List,

I'm using this FIO-job to stress-test iSCSI-Targets:

[global]
disable_lat=1
disable_clat=1
disable_slat=1
clat_percentiles=0
time_based
runtime=${SECONDS}
nice=10
prio=5
ioengine=libaio
iodepth=16
direct=1
iomem_align=4M
verify=crc32c-intel
verify_async=2
do_verify=1
verify_dump=1
[iSCSI]
rw=randwrite
bsrange=4k-4M
filename=${ISCSI_DEVICE}

ISCSI_DEVICE=/dev/sdX
SECONDS=some value how long it should take

When running this job I cannot see the verification taking place.  I.e. network thruput to the target (writing) is happening at around 115MB/s, but thruput from the target (reading/verifying) doesn't exceed 2,7MB/s.

Am I doing something wrong, here?

Mit freundlichen Grüßen
Stefan Hübner,
OECE - open-e certified engineer
xtivate Service-Team

WWWgroup GbR
Michael Sänger, Jens Walter, Jörg Weißmantel
Ziegelhüttenweg 4

98693 Ilmenau
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