The Question is:
I'm looking for a tool to test IO performance that will let me find the upper
boundries of write and read performance.
The Answer is :
How much coding and testing and implementation work do you want to
do, what sort of detail do you want to see, what sort of storage
or communications hardware is involved, how much data is involved,
what processors are involved, and do you have a particular budget
for the purchasing of or the development of performance tools?
For some configurations and requirements, tools such as BACKUP or
COPY can be used. For other environments, custom I/O tools may be
required. (OpenVMS Engineering, for instance, has implemented
diagnostic tools that hammer on various I/O systems and devices.)
For DECnet Phase IV, tools such as DTS/DTR (DTSEND and DTRECV) can
be used. Other network protocols have other tools.
Tools such as MONITOR and its ability to monitor the average I/O
queue length can be used to check for saturation. MONITOR can also
be used to record and to then play back system activity. (There
are also mechanisms for monitoring RMS file system activity -- see
MONITOR RMS and related -- as well.)
HP Services can discuss custom requirements or performance-tuning
assistance requirements, obviously.