Raid 10 - Very slow

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http://serverfault.com – I have Software Raid 10 setup, it has been working great a few months. When I did a quick HD speed test: dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync It is taking forever and I had to terminate it, the result was: 1073741824 bytes (1.1 GB) copied, 151.27 s, 7.1 MB/s What causing this? [root@host ~]# cat /proc/mdstat Personalities : [raid1] [raid10] md2 : active raid1 sdc1[4] sdd1[3] sdb1[1] sda1[0] 204788 blocks super 1.0 [4/4] [UUUU] md127 : active raid10 sdc4[4] sdb4[1] sdd4[3] sda4[0] 1915357184 blocks super 1.2 256K chunks 2 near-copies [4/4] [UUUU] md1 (HowTos)