I have set up a 3-disk raid10 using f2 layout using 3x SATA disks each capable of 70+ MB/s (give or take). The CPU is a dual core 64 bit Athlon 3600+, and the SATA interface consists of NVidia MCP55+ (PCIe or whatever). Previously this was a 3 disk raid5. The problem: I'm getting really awful transfer rates. 7-9MB/s per-drive with 21-30MB/s combined. The average hangs around 22-24MB/s. This, I feel, is really awful! What parameters can I twiddle to improve the performance? I am not using NCQ. The drives individually are capable of 70+ MB/s. I am using the deadline I/O scheduler but I have tried the others. This is the openSUSE 2.6.22.17 kernel. I am getting the I/O rates via dstat. I am using the jfs filesystem primarily. The operation I am performing varies but the I/O rates don't (much). In particular, moving one 17G file from a logical volume (I am using LVM) to another, both filesytems are JFS. The load is around 2.6, with these four processing being the top CPU consumers (they wiggle around a bit): 2034 root 10 -5 0 0 0 D 10 0.0 201:00.30 md0_raid10 10631 root 18 0 8436 1076 668 D 7 0.1 2:07.65 mv 218 root 15 0 0 0 0 D 3 0.0 2:06.30 pdflush 2182 root 10 -5 0 0 0 S 3 0.0 0:32.51 jfsCommit Is there more information that I can provide that can help explain why I'm getting such slow speeds? -- Jon -- 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
