On 25/01/2012 18:15, Seth Jennings wrote: [...]
write /home: dd if=/dev/zero of=zeroes <ctrl-c> 208385+0 records in 208384+0 records out 106692608 bytes (107 MB) copied, 27.6739 s, 3.9 MB/s
[...]
so writing is aweful (2-5 tps per disk with 98% iowait?!). write /dev/sdc1 (non-raid part in /dev/sdc) dd if=/dev/zero of=zeroes bs=4096 count=100000 100000+0 records in 100000+0 records out 409600000 bytes (410 MB) copied, 2.64131 s, 155 MB/s
[...]
so writing to non-raid partition of one of the disks is good.
You should be comparing apples with apples. Try the single drive test again without bs=4096, the md test again with bs=4096, then both again with bs=64K, bs=192K, bs=1M.
Cheers, John. -- 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
