Fluffles wrote: > gstripe (4 disks on nVidia controller [Embedded], 128KB stripesize, Test > System 1) > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > DD benchmark(1GB) Results in MB/s avg > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > 4k READ 47.1 46.9 46.8 46.9 > WRITE 40.9 40.9 41.0 40.9 > 16k READ 92.7 92.8 92.6 92.7 > WRITE 76.3 76.1 76.2 76.2 > 64k READ 120.8 120.6 120.6 120.6 > WRITE 96.1 96.2 96.1 96.1 > 128k READ 123.0 122.8 122.8 122.8 > WRITE 96.3 96.4 96.2 96.3 > 1m READ 122.7 122.9 122.6 122.7 > WRITE 89.4 89.4 89.4 89.4
So, writing to a striped set is 37% faster than reading... > geom_raid5 with 8 SATA disks (128KB stripe, graid5-tng, Test System 2) > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > DD benchmark(1GB) Results in MB/s avg > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > 4k READ 58.1 58.7 59.0 58.6 > WRITE 155.5 155.8 154.3 155.2 > 16k READ 130.0 125.6 129.5 128.3 > WRITE 308.5 306.3 306.9 307.2 > 64k READ 183.8 183.9 188.9 185.5 > WRITE 416.9 416.7 415.8 416.4 > 128k READ 197.3 194.4 197.6 196.4 > WRITE 421.0 426.2 399.7 415.6 > 1m READ 193.0 196.8 198.1 195.9 > WRITE 327.6 330.3 331.0 329.6 > Similar here: 69% faster, even though writing to RAID5 involves block ECC (XOR probably) calculations and writing to at least two disks, and reading doesn't. Interesting. Any ideas why? (anybody?)
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