With 4 Raptor 150s & XFS (default XFS options): # Stripe tests: echo 8192 > /sys/block/md3/md/stripe_cache_size # DD TESTS [WRITE] DEFAULT: $ dd if=/dev/zero of=10gb.no.optimizations.out bs=1M count=10240 10240+0 records in 10240+0 records out 10737418240 bytes (11 GB) copied, 96.6988 seconds, 111 MB/s 8192 STRIPE CACHE $ dd if=/dev/zero of=10gb.8192k.stripe.out bs=1M count=10240 10240+0 records in 10240+0 records out 10737418240 bytes (11 GB) copied, 55.0628 seconds, 195 MB/s $ 16384 STRIPE CACHE $ dd if=/dev/zero of=10gb.16384k.stripe.out bs=1M count=10240 10240+0 records in 10240+0 records out 10737418240 bytes (11 GB) copied, 56.2793 seconds, 191 MB/s # DD TESTS [READ] DEFAULT: $ dd if=10gb.16384k.stripe.out of=/dev/null bs=1M 298+0 records in 297+0 records out 311427072 bytes (311 MB) copied, 3.5453 seconds, 87.8 MB/s 2048K READ AHEAD $ dd if=10gb.16384k.stripe.out of=/dev/null bs=1M 10240+0 records in 10240+0 records out 10737418240 bytes (11 GB) copied, 85.4632 seconds, 126 MB/s 8192K READ AHEAD $ dd if=10gb.16384k.stripe.out of=/dev/null bs=1M 10240+0 records in 10240+0 records out 10737418240 bytes (11 GB) copied, 64.9454 seconds, 165 MB/s 16384K READ AHEAD $ dd if=10gb.16384k.stripe.out of=/dev/null bs=1M 10240+0 records in 10240+0 records out 10737418240 bytes (11 GB) copied, 59.3119 seconds, 181 MB/s - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
