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and Exchange benchmarks illustrate the expected performance in those
application environments. Simple file copies show throughput in megabytes
per second (MB/sec) and IOmeter simulates IOPS (inputs/outputs per second)
and throughput.
Microsoft SQLIOStress - The SQLIOStress utility was written and is
maintained by the Microsoft SQL Server Escalation staff. Designed to help
detect possible I/O path problems that would lead to Microsoft SQL Server
data corruption or loss, it emulates different SQL server database versions
and types and reports on some basic benchmarks. At a minimum it runs 5
iterations. Only the third and fourth iterations should be used for comparing
performance according to the SQLIOStress tool documentation. For this
document the 4th iteration will be used. The SQLIOStress test runs from only
a single host and typically becomes CPU bound. The tool is not capable of
scaling at the same rate as the SAN. Some scaling is achieved on a single host
due to the lower latency in the SAN.
Best Practice - Keep the data files and logs for SQL databases on
separate volumes.
Microsoft Exchange Jetstress – The Jetstress tool that allows
administrators to verify the performance and stability of the disk subsystem
before putting their Exchange server into a production environment. It
reports back to the administrator with an html document that contains
results and a PASS or FAIL for the overall test. A PASS or FAIL is strictly
based on specific test results not exceeding Microsoft specified limits. Disk
Latency is the primary metric used by Jetstress for PASS / FAIL criteria. The
values to pass are the log avg. disk sec/write, database page fault stalls, and
database avg. disk sec/read. Log average latency should be below 10ms,
database page fault stalls should always be 0, and database average read
latency should be less than 20ms. LeftHand Networks uses an automated
command line version of Jetstress that will increase threads until the test no
longer passes and records the IOPS of the last passing run. The highest IOPS
achieved while still passing is the value reported in this paper.
Best Practice – Keep the email database files and log files on
separate volumes.
File Copy Using Robust File Copy - The file copy test is a straight-forward
Windows file copy. Using robocopy.exe a file copy of one hundred 100MB files
is done from direct attached storage (DAS) in the server to a volume on the
SAN. For this test a simple measurement of megabytes per second is taken.
Robocopy (Robust File Copy) is included in the Windows resource kit. While
individual file copy speeds are limited by the nature of low queue depth disk
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