On Thu, Oct 18, 2007 at 09:20:32AM +0100, Richard Tector wrote: > Stefan Lambrev wrote: >> Enabling write cache really helps, so now I have to find a battery backup >> unit for the controller (if it supports it). >> Anyway here are the results of bonnie++ : >> Version 1.93c ------Sequential Output------ --Sequential Input- >> --Random- >> Concurrency 1 -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 >> netguard.com 16G 416 99 63957 15 26411 8 702 99 70399 13 192.2 >> 5 >> Latency 21185us 462ms 785ms 22855us 134ms >> 139ms >> Version 1.93c ------Sequential Create------ --------Random >> Create-------- >> netguard.com -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- >> files:max:min /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP >> /sec %CP >> 256:65536:65536/16 865 13 897 9 30908 60 858 13 88 2 6251 >> 48 >> Latency 1082ms 136ms 357ms 1678ms 3044ms >> 1065ms >> 1.93c,1.93c,netguard..com,1,1192619536,16G,,416,99,63957,15,26411,8,702,99,70399,13,192.2,5,256,65536,65536,,16,865,13,897,9,30908,60,858,13,88,2,6251,48,21185us,462ms,785ms,22855us,134ms,139ms,1082ms,136ms,357ms,1678ms,3044ms,1065ms >> But isn't 70MB/s sequential read little slow for raid 1 with 2x500GB SATA >> II HDDs? > > 70MB/s from desktop drives is pretty respectabloe, IMHO. In a RAID 1 configuration, I would say 70MByte/sec read is more than decent. That's about what I get from an individual drive on a built-in nVidia nForce 4 SATAII controller. Here's a sequential read from a disk on that controller, using dd and gstat; sometimes it hits 78MB. ad10: 476940MB <Seagate ST3500630AS 3.AAE> at ata5-master SATA300 L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name 1 571 571 72850 1.4 0 0 0.0 82.0| ad10 You might also want to verify that the disks are actually running at SATA300 speeds (which won't necessarily gain you a lot over SATA150, but worth turning on assuming it's compatible with your controller). Seagate drives, for example, have a little jumper on them that limits the interface to SATA150; remove it. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |Received on Thu Oct 18 2007 - 06:58:12 UTC
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