FreeNAS 0.7 - diskinfo of a SuperTalent UltraDrive ME MLC 64GB

I've bought a SuperTalent UltraDrive ME MLC 64GB for playing around with SSD's. So I will provide here my experiences

For the FreeNAS 0.7 ZFS tests I've installed this SSD into a PC with a Intel Core2Quad Q6000 (2.4 GHz), 8 GB RAM. Mainboard Intel DG965WH.

My first test is a quick diskinfo -ct

Here we go...

freenas:~# diskinfo -ct /dev/ad6

/dev/ad6

512 # sectorsize

64023257088 # mediasize in bytes (60G)

125045424 # mediasize in sectors

124053 # Cylinders according to firmware.

16 # Heads according to firmware.

63 # Sectors according to firmware.

ad:P565045-BDIX-6029019 # Disk ident.

I/O command overhead:

time to read 10MB block 0.068941 sec = 0.003 msec/sector

time to read 20480 sectors 1.169508 sec = 0.057 msec/sector

calculated command overhead = 0.054 msec/sector

Seek times:

Full stroke: 250 iter in 0.024970 sec = 0.100 msec

Half stroke: 250 iter in 0.025027 sec = 0.100 msec

Quarter stroke: 500 iter in 0.049870 sec = 0.100 msec

Short forward: 400 iter in 0.039449 sec = 0.099 msec

Short backward: 400 iter in 0.039230 sec = 0.098 msec

Seq outer: 2048 iter in 0.114818 sec = 0.056 msec

Seq inner: 2048 iter in 0.123779 sec = 0.060 msec

Transfer rates:

outside: 102400 kbytes in 0.696010 sec = 147124 kbytes/sec

middle: 102400 kbytes in 0.618375 sec = 165595 kbytes/sec

inside: 102400 kbytes in 0.623304 sec = 164286 kbytes/sec

As comparison... here is the same command with a WD20EADS 2TB

quake:~# diskinfo -ct /dev/ad4

/dev/ad4

512 # sectorsize

2000398934016 # mediasize in bytes (1.8T)

3907029168 # mediasize in sectors

3876021 # Cylinders according to firmware.

16 # Heads according to firmware.

63 # Sectors according to firmware.

I/O command overhead:

time to read 10MB block 0.072554 sec = 0.004 msec/sector

time to read 20480 sectors 2.515795 sec = 0.123 msec/sector

calculated command overhead = 0.119 msec/sector

Seek times:

Full stroke: 250 iter in 6.150143 sec = 24.601 msec

Half stroke: 250 iter in 4.960021 sec = 19.840 msec

Quarter stroke: 500 iter in 8.214024 sec = 16.428 msec

Short forward: 400 iter in 2.523203 sec = 6.308 msec

Short backward: 400 iter in 2.008208 sec = 5.021 msec

Seq outer: 2048 iter in 0.298850 sec = 0.146 msec

Seq inner: 2048 iter in 0.379041 sec = 0.185 msec

Transfer rates:

outside: 102400 kbytes in 1.077248 sec = 95057 kbytes/sec

middle: 102400 kbytes in 1.378671 sec = 74274 kbytes/sec

inside: 102400 kbytes in 2.267264 sec = 45165 kbytes/sec

As you can see... the seek times of the SSD are impressive!