FFS Disk timing tests

[FILLMORE%EM...@cornellc.cit.cornell.edu]

I have just finished configuring the DH0: partition on my GVP 80mb Quantum
hardcard as a FFS (Fast File System) partition, and decided to do some
disk performance tests. I kept my DH1: partition configured without
FFS for test purposes. I've also shown a couple of timings from the
November 1988 Amazing Computing article on disk performance for comparison.
All tests use the DiskPerfA program on Fish disk 48.

GVP Quantum ProDrive 80S 2090A ctlr GVP ctlr
DH0: DH1: 63mb drive 63mb drive
FFS no FFS FFS FFS
Create files 15/sec 9/sec 12/sec 13/sec
Delete files 41/sec 29/sec 41/sec 20/sec
Scan directory 102/sec 41/sec 102/sec 98/sec
Seek/reads 113/sec 77/sec 83/sec 59/sec

512 byte read 62.4 kb/sec 34.5 kb/sec 55.6 kb/sec 28.7 kb/s
512 byte write 29.1 kb/sec 14.3 kb/sec 27.5 kb/sec 27.5 kb/s
4096 byte read 201.6 kb/sec 45.2 kb/sec 106.7 kb/sec 159.6 kb/s
4096 byte write 131.1 kb/sec 14.6 kb/sec 134.7 kb/sec 88.2 kb/s
8192 byte read 262.1 kb/sec 45.2 kb/sec 182.8 kb/sec 159.6 kb/s
8192 byte write 145.6 kb/sec 14.6 kb/sec 150.6 kb/sec 111.3 kb/s
32768 byte read 327.7 kb/sec 46.0 kb/sec 320.0 kb/sec 170.6 kb/s
32768 byte write 187.2 kb/sec 14.6 kb/sec 232.7 kb/sec 121.9 kb/s

Elapsed seconds 100 375 107 139

It is apparent from these figures that the GVP controller is capable of
much better performance given a good drive. The Quantum ProDrive has
a built-in 64K cache which accounts for the very good read performance.
Also note that these figures are better than the same tests run on a
Sun 3/50 workstation and some of the smaller VAXs.
Let's hear from some other hard disk owners about their configurations!
- Bob Fillmore, Ottawa, Canada FILL...@EMRCAN.BITNET
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