i/o benchmark: vxbench

[Fred True]

To whoever was looking for one of these (sorry, I misplaced the original
msg); if you have a relationship with veritas or are using vxvm, ask them
for a copy of vxbench.  It's a simple tool but can prove quite useful at
demonstrating device or filesystem performance under various i/o loads.

It allows sequential or random i/o; read, write or mixed tests, and has a
bunch of knobs:

        "nrep=n            repeat the I/O loop in the test n times",
        "nthreads=n        number of threads accessing each file",
        "iosize=n          size of each I/O",
        "fsync             do an fsync on the file after writing it",
        "remove            remove each file after the test",
        "iocount=n         number of I/Os",
        "reserveonly       reserve space for the file but don't do I/O",
        "maxfilesize       maximum offset in K for random I/O tests",
        "randseed          seed value for random number generator",
        "truncup           set an inital file size for random I/O",
        "rdpct=n           set read percentage of job mix for mixed tests",

Perhaps someone from veritas could post this to the list; or give me
permission to do so?

Fred

--
Fred True				"My name is Ozymandias, King of Kings:
AT&T Labs Network Mathematics Research	 Look on my works, ye Mighty,
ft@research.att.com			 and despair!"
						-P. B. Shelley