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Home > Hardware Reviews > Optical Storage > Blue Laser

Wednesday, October 26, 2005
Plasmon UDO30D-SE

3. Performance

We'll start by looking at IOMeter's output for the UDO Desktop Drive with the file server access pattern. We allowed the test to run for a period of 5 minutes. We also ran the same test on a Western Digital 80GB EIDE hard disk and a Fujitsu MHV2060AT 60Gb 2.5" drive, and have provided the output from both as a comaprison. While the two hard drives have very little in common with the UDO drive other than providing storage, the comparison does provide a way to judge the UDO Drive's performance and as we will see, there are some surprises.
Operation Plasmon UDO Drive Fujitsu 60 GB mini disk WD800JB 80GB HDD
IOps
Read IOps
Write IOps
17.19
13.72
3.47
87.39
70.05
17.34
155.13
123.92
31.20
MBps
Read MBps
Write MBps
0.1831
0.14724
0.03586
0.951854
0.765295
0.186559
1.676123
1.331478
0.344645
Transactions per Second 17.19 87.39 155.13
Times are in milliseconds
Avg. Response Time
Avg. Read Response Time
Avg. Write Response Time
Avg. Transaction Time
58.15
62.28
41.82
58.15
45.75
48.23
35.74
45.75
25.78
26.75
21.90
25.78
Max. Response Time
Max. Read Response Time
Max. Write Response Time
Max. Transaction Time
15,665.09
1,000.07
15,665.09
15,665.09
313.38
313.38
244.58
313.37
105.56
105.56
84.36
105.56
Errors
Read Errors
Write Errors
0
0
0
0
0
0
0
0
0
Bytes Read
Bytes Written
46,401,024
11,300,864
241,184,256
58,794,496
419,644,416
108,622,336
Read I/Os
Write I/Os
4,124
1,043
21,053
5,212
37,249
9,379

The Western Digital Hard Disk wins hands down, as we would expect it to. However, the UDO drive does clock in some impressive figures for an optical drive. Its Avg. response times are not that far behind those of either hard disk.

The following table however, should prove more interesting. It shows the UDO Drive's output for 3 separate Iometer configurations, set to 100% reading of 512 byte, 16k byte and 32k byte file sizes. Setting Iometer to 100% reads, more closely simulates the type of work the drive will be expected to carry out. Again, the tests were run for 5 minutes.

Operation 512 bytes 16k bytes 32k bytes
Read IOps 264.10 135.42 67.94
Read MBps 0.13 2.12 2.13
Transactions per Second 264.10 135.42 67.94
Times are in milliseconds
Avg. Read Response Time 3.78 7.38 14.71
Max. Read Response Time 150.48 186.21 116.67
Read Errors 0 0 0
Bytes Read 40,644,096 666,877,952 669,155,328
Read I/Os 79,383 40,703 20,421

It is interesting to see the difference in performance between small files and larger files. At 16k and 32k, the throughput (Read MBps) does not differ by much with 2.12MB/s and 2.13MB/s respectively. For 512 bytes however, it drops to 130kB/s. A similar pattern appears with total amount of bytes read, where for 16k and 32k the figures are fairly close at 636Mb and 638Mb respectively, while for 512 bytes, the corresponding figure is only 39Mb.

The last test we put our UDO drive through was to copy a full DVD movie to the drive. We used DVD Decryptor to copy Gladiator from a Pioneer DVR 108 drive. The process was completed in 1:00:40 with an average read rate of 1,974 KB/s (1.4x) and maximum read rate of 4,167 KB/s (3.0x). As a comparison, the same process but with the copy being written to the Western Digital Hard Disk, had a duration of 00:24:40 with an average read rate of 4,857 KB/s (3.5x) and maximum read rate of 6,949 KB/s (5.0x).




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