Sequential Output Sequential Input Per Chr Block Rewrite Per Chr Block Seeks 2 Sun T3 arrays striped with 9 36G 10k FC drives each in raid 5 34628 98 97983 53 23168 14 23316 52 39077 9 493.3 2 2 120G SATA 7.2k drives mirrored 39559 98 32715 14 19937 6 32036 67 52231 7 152.4 0 18 36G 10k FC drives striped (2 fibre HBAs) 36872 86 105102 42 42891 13 44576 91 94577 11 768.1 2 22 36G 10k FC drives raid 10 2 hbas 32211 82 50606 22 30970 11 42654 85 142983 19 463.3 2 raid 6 on 6 15k sas drives 38918 99 60365 20 47062 20 40098 96 301104 77 1020.1 2 raid 5 on 6 15k sas drives 38689 99 64907 22 54682 23 40320 95 282653 72 1084.8 3 raid 0+1 on 6 15k sas drives 38816 99 229062 78 71931 23 40645 95 267418 43 1353.1 2 raid10 on 6 15k sas drives 38452 98 198675 69 75246 24 41565 98 265031 44 1388.4 2 raid10 on 6 15k sas drives far layout 38481 99 141594 48 64286 20 39949 93 444972 77 1245 2 4 processes (on 4 core system) results are the sum raid 6 on 6 15k sas drives raid 5 on 6 15k sas drives 37465 26 37095 5 30527 5 102828 60 174263 10 990.2 1 raid 10 on 6 15k sas drives 111239 77 128287 17 62550 5 93400 55 230320 11 1181.9 1 raid10 on 6 15k sas drives 113700 79 151060 24 53939 4 89997 52 151195 6 1051.9 0 raid10 on 6 15k sas drives far layout 103353 72 120697 15 49203 4 100501 58 155528 6 1074 0

Number of server to get X Gig Space 337 500 750 survive one fail Space*4 Space*3 Space*2 raid 6 on 6 15k sas drives 240 2 3 4 960 720 480 raid 5 on 6 15k sas drives 300 2 2 3 1200 900 600 raid 10 on 6 15k sas drives 180 2 3 5 720 540 360 3 mirrors on 6 15k sas drives (there are 3 copies of each block) 120 3 5 7 480 360 240