Here are some bonnie numbers for a few tests:
2.6.20, only 1 drive active in md device (other drive pulled for testing):
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
testbox 7G 45165 76 55461 8 25677 5 53573 90 66251 7 194.1 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
testbox,7G,45165,76,55461,8,25677,5,53573,90,66251,7,194.1,0,16,+++++,+++,+++++,
+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
2.6.20, 2 drives in raid1:
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
testbox 7G 47633 80 56795 10 27598 5 53675 89 66643 7 283.6 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
testbox,7G,47633,80,56795,10,27598,5,53675,89,66643,7,283.6,0,16,+++++,+++,+++++
,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
2.6.21-rc2 (for completeness), 2 drives in raid1:
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
testbox 7G 48128 83 56330 10 28183 5 53173 89 66425 6 307.1 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
testbox,7G,48128,83,56330,10,28183,5,53173,89,66425,6,307.1,0,16,+++++,+++,+++++
,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
Just about the only stat in these tests that show a marked improvement between
one and two drives is Random Seeks (which makes sense). What doesn't make sense
is that none of the Sequential Input numbers increase. Shouldn't I be seeing
close to a 100% improvement? Of course a 100% increase in performance is the
theoretical maximum, but these numbers show no improvement at all. Both drives
are 320Gb Seagate 7200RPM Barracudas, part number ST3320620AS. The motherboard
is a SuperMicro PDSME+. Any insight will be appreciated.
Dan
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