April 13, 201313 yr Some DD performance tests for you, i'll be doing a battery of tests by transferring 16GB of various size files to throughly test my array at some point this week. Parity is a WD2002FAEX, (2TB WD Black) via SATA 3, as is the 2x1TB platter Barracuda. Writing 8GB: Seagate 2x1TB platter Barracuda 7200 RPM - 63% full root@Tower:/mnt/disk1# dd bs=8M count=1024 if=/dev/zero of=test conv=fdatasync Write: 8589934592 bytes (8.6 GB) copied, 154.195 s, 55.7 MB/s Read: 8589934592 bytes (8.6 GB) copied, 47.4379 s, 181 MB/s!!!!! Seagate 3x667GB platter Barracuda 7200 RPM - 48% full Write: 8589934592 bytes (8.6 GB) copied, 165.999 s, 51.7 MB/s Read: 8589934592 bytes (8.6 GB) copied, 62.1818 s, 138 MB/s WD20EARS (Green 2TB) - 75% full Write: 8589934592 bytes (8.6 GB) copied, 227.785 s, 37.7 MB/s Read: 8589934592 bytes (8.6 GB) copied, 72.2619 s, 119 MB/s Those 1TB platter Barracudas are FAST.
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