Messages in this thread | | | From | Andreas Peter <> | Subject | SW-RAID0 Performance problems | Date | Fri, 13 Apr 2001 13:47:30 +0200 |
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Hi, I've successfully set up SW-RAID0 with Kernel 2.4.3 and Raidtools 0.9. I did this to increase the performance of my HD, but nothig happens. The hdparm results: hdparm -t /dev/md0 : 20.25 MB/sec hdparm -t /dev/hda : 20.51 MB/sec hdaprm -t /dev/hdc : 20.71 MB/sec
I thougt the performnace of RAID0 should near 40MB/sec. I played with different chunk-sizes, but the result was everytime the same. The drives are both Maxtor DiamondMax VL40, 30GB, DMA on. No other drive is attached on the bus.
Here are also some bonnie++ results:
-- RAID-0 -- -- chunk-size=16 --
Version 1.01 ------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 debian 1G 7416 99 14277 20 7498 10 6942 90 27007 20 113.0 1 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 267 99 +++++ +++ 10968 100 269 99 +++++ +++ 1388 99
-- chunk-size=32 --
Version 1.01 ------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 debian 1G 7396 99 14075 20 7469 10 6945 90 26960 20 133.7 1 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 265 100 +++++ +++ 10695 99 267 99 +++++ +++ 1447 100
-- Single HD /dev/hdc1 --
Version 1.01 ------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 debian 1G 7173 96 11055 13 5038 6 5999 78 29146 21 90.7 1 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 272 100 +++++ +++ 10482 99 274 99 +++++ +++ 1437 100
Are there known performanace problems with 2.4.3, or is it necessary to apply patches to the kernel? Or did I something wrong?? Thank you for every hint!
Andreas -- Andreas Peter *** ujq7@rz.uni-karlsruhe.de
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