[Info-vax] VAX Harddisk Benchmark / VAX 4000/105A SCSI performance

[hans.huebner at gmail.com]

Hi,

does anyone happen to have a hard disk or file system benchmark for VAX/VMS that they'd be willing to share?  I need to get rid of the RF36 drive that is in my VAX 4000/105A as it is too loud and I would like to experiment with a few SCSI options.  Having a way to measure relative performance would be useful.

I've been unable to find information as to the performance of the SCSI subsystem in the 4000/105A, in particular in comparison to DSSI.  I tend to suspect that even if the SCSI transfer rate is slower than that of the DSSI bus, a solid state drive on the SCSI bus would still be overall faster than the RF36.  Then again, I could be wrong, so I'm looking for a way to measure (or experience reports from knowledgeable people).

I can write my own benchmark, but maybe there is some benchmarking tool that can generate a specific I/O mix of random and sequential accesses and report the results already?

Thanks,
Hans