Very odd, RAID5 reading should be about the same as RAID0. And your old array confirms that. My guess is RAID5 needs some help. Neil? Any ideas? Is your stripe size the same on both? Did you allow your array to re-sync before the tests? Guy -----Original Message----- From: Stephan van Hienen [mailto:raid@xxxxxxxx] Sent: Monday, November 29, 2004 3:52 AM To: Guy Cc: linux-raid@xxxxxxxxxxxxxxx Subject: raid5 slow > 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,26828,99,123983,73,58525,57,27336,99,171371,96,583.9,4,1 6,1023,12,+++++,+++,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) -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.289 / Virus Database: 265.4.3 - Release Date: 11/26/2004 - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
