LU-9273 tests: disable random I/O in replay-ost-single/5

disable random I/O in replay-ost-single/5 as it's very slow
on ZFS - this is due to grants as the client consume them
way too quickly: 1MB blocksize + ~0.5MB metadata overhead
for each random 4K written by iozone.

Test-Parameters: trivial ostcount=7 clients=2 ostfilesystemtype=zfs mdtfilesystemtype=zfs testlist=replay-ost-single envdefinitions=SLOW=yes,ONLY=5
Test-Parameters: trivial ostcount=7 clients=2 ostfilesystemtype=zfs mdtfilesystemtype=zfs testlist=replay-ost-single envdefinitions=SLOW=yes,ONLY=5
Test-Parameters: trivial ostcount=7 clients=2 ostfilesystemtype=zfs mdtfilesystemtype=zfs testlist=replay-ost-single envdefinitions=SLOW=yes,ONLY=5
Test-Parameters: trivial ostcount=7 clients=2 ostfilesystemtype=zfs mdtfilesystemtype=zfs testlist=replay-ost-single envdefinitions=SLOW=yes,ONLY=5
Test-Parameters: trivial ostcount=7 clients=2 ostfilesystemtype=zfs mdtfilesystemtype=zfs testlist=replay-ost-single envdefinitions=SLOW=yes,ONLY=5

Change-Id: Ic49429b8c681fdc16e5f95f483d78198b6f4804c
Signed-off-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-on: https://review.whamcloud.com/31671


Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>

lustre/tests/replay-ost-single.sh

@@ -157,7 +157,8 @@ test_5() {
 	if (( size > GB )); then
 		size=$GB
 	fi
-	local iozone_opts="-i 0 -i 1 -i 2 -+d -r 4 -s $size -f $TDIR/$tfile"
+	# no random I/O (-i 2) as it's very slow with ZFS
+	local iozone_opts="-i 0 -i 1 -+d -r 4 -s $size -f $TDIR/$tfile"
 
 	iozone_bg $iozone_opts &
 	local pid=$!