On Fri, 2008-09-26 at 10:35 -0400, John Drescher wrote:

> Here is what I get on a 5 drive software raid5
> 
>  # dd if=/dev/zero of=/bigfile bs=1M count=8192
> 8192+0 records in
> 8192+0 records out
> 8589934592 bytes (8.6 GB) copied, 44.8402 s, 192 MB/s

I have tried testing directly to the block device, to bypass any
filesystem related issues:

# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [raid0] [raid1] 
md0 : active raid5 sdg1[5] sdf1[4] sde1[3] sdd1[2] sdc1[1] sdb1[0]
      48877120 blocks level 5, 64k chunk, algorithm 2 [6/6] [UUUUUU]
      
# dd  if=/dev/zero of=/dev/md0 bs=64k count=65536
65536+0 records in
65536+0 records out
4294967296 bytes (4.3 GB) copied, 57.2713 seconds, 75.0 MB/s

# dd  if=/dev/zero of=/dev/md0 bs=1M count=4096
4096+0 records in
4096+0 records out
4294967296 bytes (4.3 GB) copied, 113.358 seconds, 37.9 MB/s

# cat /sys/block/md0/md/stripe_cache_size 
1024


Maybe your disks are just a lot faster than mine....




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