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-
- These are the results of some testing I did late last winter on
- three different hard drive controllers. I compared a Western
- Digital "Cobra" card, an Adaptec 2010A (predecessor to the 2070A)
- and an Adaptec 2070A (the famed RLL controller). I wanted to
- confirm for myself the claims being made about the 2070 and compare
- it against other products available to me.
-
- In order to measure the speed of the controllers with as little
- system overhead as possible, I set up a small RAM disk to contain
- the programs I needed for the testing. The files I used to auto-
- mate the procedure are listed below.
-
- For the actual speed test, Norton's DT (Disk Test) was used. I
- chose this program because it appeared to read the whole disk in
- a sequential manner. I divided the total size of the disk as
- reported by CHKDSK by the number of seconds DT took to execute
- to get the kbits/sec values in the charts.
-
- An AT&T PC 6300 with PC-DOS 3.10 was used for all tests. I have
- found that different brands of machines may give different results
- and may even vary between machines of the same line.
-
- The best interleave for your computer is something you have to
- determine based on what your applications are. Adaptec states in
- their manual:
-
- "2 to 1 is the optimum interleave factor for the IBM PC/XT. This
- typically will give the highest performance on the IBM PC/XT. The
- optimum interleave factor is a function of the number of devices
- making requests on the bus, and the number of blocks transferred
- at one time by the applications software. Experimentation with
- different interleave factors is the best way of determining the
- optimum interleaving factor for your application."
-
- Jerry Wallace
- Mpls, MN
-
- ---------------------------------------
-
- You can find Jerry and others at Terrapin Station BBS!
- A BBS for programmers and technically oriented users!
- 612/623-0152 24 hours/day 1200/2400
-
- ---------------------------------------
-
- DISKTEST.BAT:
-
- time 00:00:00
- d:dt c: < d:kb
- time
-
- KB:
-
- d
-
- ---------------------------------------
-
- Seagate ST-225
-
- Adaptec 2070A Adaptec 2010A
-
- Total
- bytes: 31,344,640 21,309,440
-
- Inter Kbits Kbits
- leave Time /sec Time /sec
- ----- ---- ----- ---- -----
- 3 7:15 576 5:55 480
- 4 7:57 526 6:33 434
- 5 8:39 483 7:14 393
-
- ---------------------------------------
-
- Rodime 204e
-
- Adaptec 2070A Adaptec 2010A
-
- Total
- bytes: 32,571,392(x2) 22,142,976(x2)
-
- Inter Kbits Kbits
- leave Time /sec Time /sec
- ----- ---- ----- ---- -----
- 3 7:29 580 6:03 488
-
- NOTE: The WD Cobra does not appear here because I did not
- have the necessary table on the controller BIOS. I
- did not run any more than an interleave of 3 because
- previous results seemed to show that this was the best
- interleave for my machine. (Plus it took 50 minutes
- per test; I didn't have the patience!)
-
- ---------------------------------------
-
- MMI 3.5" 10MB
-
- Adaptec 2070A Adaptec 2010A WD Cobra
-
- Total
- bytes: 15,572,992 10,584,064 10,584,064
-
- Inter Kbits Kbits Kbits
- leave Time /sec Time /sec Time /sec
- ----- ---- ----- ---- ----- ---- -----
- 1 -- --- 3:38 388 6:44 210
- 2 -- --- 3:56 359 6:50 207
- 3 2:34 809 2:12 641 7:05 199
- 4 2:54 716 2:33 553 7:26 190
- 5 3:15 639 2:54 487 6:33 215
- 6 3:23 614 3:14 436 3:15 434
- 7 3:43 559 3:22 419 3:35 394
- 8 4:04 511 3:42 381 3:57 357
- 9 4:24 472 4:03 348 4:04 347
-
- NOTE: These really are the values I got last winter! They
- seemed fast to me, so I checked them again and got
- the same results. These were done with an un-modified
- DOS, so the cluster size is 4k. On the same disk with
- a 2k cluster size, the 2010A at an interleave of 3 runs
- at about 480 Kbits/sec.
-
- Also, the 2070 does not offer interleaves of 1 or 2 in
- it's configuration procedure, hence they are not presented
- here.