Here's some stats on an Indy, using a BlueSCSI F4 XVCR from Androda (https://androda.work/product/desktop-f4-xcvr-bluescsi-f4-xcvr-tba-d-thtv1/)
IRIS 1% diskperf -W -n "BluesCSI F4 XCVR" -c 250MB -t 60 /tmp/test
#---------------------------------------------------------
# Disk Performance Test Results Generated By Diskperf V1.2
#
# Test name : BlueSCSI F4 XCVR
# Test date : Sun Jan 2 18:39:57 2000
# Test machine : IRIX IRIS 6.5 10070055 IP22
# Test type : XFS data subvolume
# Test path : /tmp/test
# Request sizes : min=4096 max=4194304
# Parameters : direct=0 time=60 scale=1.000 delay=-0.000
# XFS file size : 4194304 bytes
#---------------------------------------------------------
# req_size fwd_wt fwd_rd bwd_wt bwd_rd rnd_wt rnd_rd
# (bytes) (MB/s) (MB/s) (MB/s) (MB/s) (MB/s) (MB/s)
4096 1.60 0.39 0.21 0.70 7.00 9.10
8192 0.67 1.08 10.21 11.85 9.63 11.28
16384 1.21 0.02 0.48 8.60 6.76 7.52
32768 1.35 0.00 0.40 8.10 8.86 9.17
65536 1.69 0.00 1.22 18.11 17.93 18.89
131072 1.61 0.00 0.53 17.08 20.57 21.03
262144 1.69 0.60 8.89 11.49 11.53 11.60
524288 1.56 0.69 20.03 23.03 21.74 23.07
1048576 1.67 0.76 20.03 22.25 23.25 23.35
2097152 1.80 0.84 18.56 21.90 23.27 22.19
4194304 1.64 0.84 0.00 0.00 23.49 17.43
IRIS 1% diskperf -W -n "BluesCSI F4 XCVR" -c 250MB -t 60 /tmp/test
#---------------------------------------------------------
# Disk Performance Test Results Generated By Diskperf V1.2
#
# Test name : BlueSCSI F4 XCVR
# Test date : Sun Jan 2 18:39:57 2000
# Test machine : IRIX IRIS 6.5 10070055 IP22
# Test type : XFS data subvolume
# Test path : /tmp/test
# Request sizes : min=4096 max=4194304
# Parameters : direct=0 time=60 scale=1.000 delay=-0.000
# XFS file size : 4194304 bytes
#---------------------------------------------------------
# req_size fwd_wt fwd_rd bwd_wt bwd_rd rnd_wt rnd_rd
# (bytes) (MB/s) (MB/s) (MB/s) (MB/s) (MB/s) (MB/s)
4096 1.60 0.39 0.21 0.70 7.00 9.10
8192 0.67 1.08 10.21 11.85 9.63 11.28
16384 1.21 0.02 0.48 8.60 6.76 7.52
32768 1.35 0.00 0.40 8.10 8.86 9.17
65536 1.69 0.00 1.22 18.11 17.93 18.89
131072 1.61 0.00 0.53 17.08 20.57 21.03
262144 1.69 0.60 8.89 11.49 11.53 11.60
524288 1.56 0.69 20.03 23.03 21.74 23.07
1048576 1.67 0.76 20.03 22.25 23.25 23.35
2097152 1.80 0.84 18.56 21.90 23.27 22.19
4194304 1.64 0.84 0.00 0.00 23.49 17.43