For testing, we will be using IOzone which runs a set of read and write benchmarks within a set parameter, then outputs a file with the results. The QNAP TS-219P Turbo NAS will be outfitted with two 500GB Seagate ST3500320AS drives and attached to a D-Link DGS 1008D Gigabit Ethernet Switch connected to my D-Link WRT DIR-655 Gigabit Ethernet router, jumbo frames disabled.

Here’s a blurb about IOzone:
IOzone is a file system benchmark tool. The benchmark generates and measures a variety of file operations. IOzone has been ported to many machines and runs under many operating systems. IOzone is useful for performing a broad file system analysis of a vendor’s computer platform. While computers are typically purchased with an application in mind it is also likely that over time the application mix will change. Many vendors have enhanced their operating systems to perform well for some frequently used applications. Although this accelerates the I/O for those few applications it is also likely that the system may not perform well for other applications that were not targeted by the operating system. An example of this type of enhancement is: Database. Many operating systems vendors have tested and tuned the file system so it works well with databases. While the database users are happy, the other users may not be as happy as the entire system may be giving all of the system resources to the database users at the expense of all other users. As time rolls on the system administrator may decide that a few more office automation tasks could be shifted to this machine. The load may now shift from a random reader application (database) to a sequential reader. The users may discover that the machine is very slow when running this new application and become dissatisfied with the decision to purchase this platform. By using IOzone to get a broad file system performance coverage the buyer is much more likely to see any hot or cold spots and pick a platform and operating system that is more well balanced.

IOzone is a command line operated testing utility; we will be using the following command.

iozone -Rab [filename].xls -i 0 -i 1 -q 64k -n 32M -g 5G -f [test location]

‘-i 0 -i 1′ Write/ Re-Write, Read/ Re-Read tests
Read: Performance measured by reading an existing file
Re-Read: Reading a file which has already been read, tests the utilization of cache

Write: Performance of writing a file to the disk
Re-Write: Re-Writes a file that already exists on the disk

‘-q 64k’ Maximum record size of 64Kb, 4Kb, 8Kb, 16Kb, 32Kb, 64Kb
‘-n 32M -g 5G’ Minimum file size of 32MB and maximum file size of 1GB
‘[file name].xls’ Location where to write test results
‘[test location]‘ Target of tests

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