Running on a P3-550, with mem=48M, Redhat 6.1 stock raid kernel-2.2.12-20, with an AHA2940UW and two Quantum Atlas IV running RAID1. Runlevel 1 and nothing running apart from tiobench. Notice the improvement in throughput and seek with growing block-sizes [a device of the benchmark, perhaps?] and too slight variation in chunk-size to be really accounted for. Chunk is 4k, Stride is 4 and Block is 1024k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.136 10.3124 98.3918 /bench 512 4096 2 11.917 9.98318 101.574 /bench 512 4096 4 8.5139 11.0758 108.755 /bench 512 4096 8 7.2364 11.4715 108.087 Chunk is 4k, Stride is 2 and Block is 2048k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.266 13.6696 115.299 /bench 512 4096 2 12.324 13.2178 118.666 /bench 512 4096 4 8.9587 12.8298 125.094 /bench 512 4096 8 8.0192 13.0665 126.954 Chunk is 4k, Stride is 1 and Block is 4096k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.371 14.1145 120.037 /bench 512 4096 2 12.249 13.5106 131.685 /bench 512 4096 4 9.1876 13.2496 132.665 /bench 512 4096 8 8.5482 13.7986 140.355 Chunk is 8k, Stride is 8 and Block is 1024k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.128 11.3823 91.1263 /bench 512 4096 2 11.752 9.94362 102.652 /bench 512 4096 4 8.5381 10.2235 106.930 /bench 512 4096 8 7.3126 11.5183 109.974 Chunk is 8k, Stride is 4 and Block is 2048k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.398 13.2741 102.241 /bench 512 4096 2 12.549 12.8811 118.060 /bench 512 4096 4 8.8188 13.0511 121.981 /bench 512 4096 8 8.1788 13.0204 124.775 Chunk is 8k, Stride is 2 and Block is 4096k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.435 14.2972 116.189 /bench 512 4096 2 12.338 13.6340 130.775 /bench 512 4096 4 9.3504 13.7868 132.297 /bench 512 4096 8 8.5547 13.7165 139.565 Chunk is 16k, Stride is 16 and Block is 1024k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.071 10.9753 88.6342 /bench 512 4096 2 12.130 11.1790 104.958 /bench 512 4096 4 8.5914 10.1130 105.978 /bench 512 4096 8 7.3064 10.7141 109.991 Chunk is 16k, Stride is 8 and Block is 2048k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.208 13.3267 99.6896 /bench 512 4096 2 12.495 12.9247 117.854 /bench 512 4096 4 8.9208 12.9478 120.037 /bench 512 4096 8 8.1958 13.1780 124.281 Chunk is 16k, Stride is 4 and Block is 4096k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.387 14.3147 115.432 /bench 512 4096 2 12.511 13.7488 131.295 /bench 512 4096 4 9.2950 13.4259 132.233 /bench 512 4096 8 8.4213 13.6868 141.201 Chunk is 32k, Stride is 32 and Block is 1024k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.232 10.0265 93.7791 /bench 512 4096 2 12.069 10.4673 103.348 /bench 512 4096 4 8.4990 11.4473 107.530 /bench 512 4096 8 7.2205 10.7598 109.822 Chunk is 32k, Stride is 16 and Block is 2048k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.307 13.3330 106.701 /bench 512 4096 2 12.398 13.0100 117.755 /bench 512 4096 4 8.8961 12.7446 123.353 /bench 512 4096 8 8.1162 12.9441 125.955 Chunk is 32k, Stride is 8 and Block is 4096k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 14.614 14.3782 124.956 /bench 512 4096 2 12.347 13.5041 130.474 /bench 512 4096 4 9.2951 13.4689 131.167 /bench 512 4096 8 8.4399 13.4807 140.217 Chunk is 64k, Stride is 64 and Block is 1024k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.108 11.9119 89.6877 /bench 512 4096 2 15.227 9.56188 92.6033 /bench 512 4096 4 15.246 9.56147 129.181 /bench 512 4096 8 12.571 10.4510 141.393 Chunk is 64k, Stride is 32 and Block is 2048k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.353 13.4630 113.448 /bench 512 4096 2 12.494 13.0713 119.382 /bench 512 4096 4 8.8512 12.9232 123.489 /bench 512 4096 8 8.2467 12.9673 127.455 Chunk is 64k, Stride is 16 and Block is 4096k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.172 14.4332 122.968 /bench 512 4096 2 12.362 13.8167 130.201 /bench 512 4096 4 9.2609 13.4655 134.367 /bench 512 4096 8 8.3182 13.6316 138.740 Chunk is 128k, Stride is 128 and Block is 1024k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.171 11.4481 91.2169 /bench 512 4096 2 12.252 10.0890 102.810 /bench 512 4096 4 8.4695 9.70564 107.007 /bench 512 4096 8 7.3208 11.2406 108.682 Chunk is 128k, Stride is 64 and Block is 2048k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.385 13.2355 99.8997 /bench 512 4096 2 12.454 12.8476 118.917 /bench 512 4096 4 8.7849 12.9645 124.186 /bench 512 4096 8 8.1072 12.9413 127.723 Chunk is 128k, Stride is 32 and Block is 4096k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.402 14.3312 114.124 /bench 512 4096 2 12.314 14.0087 133.383 /bench 512 4096 4 9.2216 13.6305 132.013 /bench 512 4096 8 8.5206 13.8933 136.653 Chunk is 256k, Stride is 256 and Block is 1024k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 14.952 10.0196 98.6290 /bench 512 4096 2 12.160 9.94473 104.061 /bench 512 4096 4 8.5039 11.2663 105.273 /bench 512 4096 8 7.2664 11.0190 110.662 Chunk is 256k, Stride is 128 and Block is 2048k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.262 13.3035 112.647 /bench 512 4096 2 12.404 12.7972 119.332 /bench 512 4096 4 8.7295 12.8259 120.995 /bench 512 4096 8 8.1697 13.0024 127.293 Chunk is 256k, Stride is 64 and Block is 4096k Machine Directory Size(MB) BlkSz Threads Read Write Seeks ----------- ----------- --------- ------- --------- ------ ------- ------- /bench 512 4096 1 15.451 14.3575 112.757 /bench 512 4096 2 12.241 13.6547 132.274 /bench 512 4096 4 9.2616 13.4612 133.482 /bench 512 4096 8 8.4481 13.6096 140.268 Cheers, -- _/\ Christian Reis is sometimes [EMAIL PROTECTED] \/~ suicide architect | free software advocate | mountain biker