raid5 slow

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it's only a bit slow :

Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
storage.a2000.nu 2G 26828 99 123983 73 58525 57 27336 99 171371 96 583.9 4
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 1023 12 +++++ +++ 920 11 1004 14 +++++ +++ 722 9
storage.a2000.nu,2G,26828,99,123983,73,58525,57,27336,99,171371,96,583.9,4,16,1023,12,+++++,+++,920,11,1004,14,+++++,+++,722,9

created a raid0 with the same disks :

Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
storage.a2000.nu 2G 28435 99 219329 73 102949 51 29704 99 275323 62 639.5 2
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 10108 84 +++++ +++ 8825 69 9877 88 +++++ +++ 7546 66
storage.a2000.nu,2G,28435,99,219329,73,102949,51,29704,99,275323,62,639.5,2,16,10108,84,+++++,+++,8825,69,9877,88,+++++,+++,7546,66



shouldn't the raid be about the same ?

now i get 275MB/sec with raid0 (14 disks)
171MB/sec with raid5 (14 disks)

while the old raid5 situation was 257MB/sec with raid5 (13 disks)
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