dalel@servio.UUCP (Dale LaFountain) (08/11/90)
I just have a simple question, to which I've already heard several different answers, most of them vague in content. So here goes, again: Does the SCSI Format program that comes with the DMA SCSI card format with 1:1 interleave? I have read from previous articles that you are queried as to which interleave you wish to use; I saw no such query when formatting. I just want to know if I am operating at optimum performance. Thank you again for your support, Dale dalel@servio.SLC.COM
UD182050@NDSUVM1.BITNET (Mike Aos) (08/12/90)
I've posted before, but since no one bothered to read it...
The utilities that come with the DMA SCSI card will format it, but it's not
1:1. It's 2:1 or worse. USE THE FINDER! It will ask you what you want to
format it at, then use ADU to partition. Since my drive was already formatted,
I ended up nuking the first few blocks with BLOCK.WARDEN so the Finder couldn't
recognise it, then asked me if I wanted for format it. Once everything was up
and running, I ran it through ProSel-16's "Statistics on Disk Access" and got
-------
Conner 40M 1:1 interleave
Non-DMA DMA
09.40 Linear 02.69
33.47 Random 35.98
00.86 OS Overhead .86
Rodime RS3000 45M 1:1
Non-DMA DMA
04.58 Linear 01.26
25.45 Random 27.04
.88 OS Overhead .86
/RAM5
04.35 Linear
07.16 Random
00.70 OS Overhead
The numbers vary a little depending on how many HD's I have connected, and
how they are terminated, and when I do it (so it seems), but only a couple
ms (actually, the Conner went from roughly 10ms linear to around 3ms linear
after I finally got everything working again today). I'm having a LOT of
problems with termination.
Mike
P.S. Does anyone have a clue how the Rodime drive can be 3.5 times faster than
/RAM5? A friend of mine says he thought his /RAM5 was faster, but he wasn't
positive.
-------
Mike
UD182050@NDSUVM1 (.Bitnet?) "Share and Enjoy"
UD182050@VM1.NoDak.Edu -Sirius Cybernetics Corporation
Apple IIgs 'till I can afford a NeXT!
I got LOTSA opinions. You want one? You can have it!TMPLee@DOCKMASTER.NCSC.MIL (08/12/90)
It was clear to me after the little exercise I just went through and reported here that a) the DMA SCSI utility disk does not format with a 1:1 interleave, and, b) it doesn't give you the chance to do anything different from what is built into it. I don't know what the advanced disk utilities program does since I couldn't get it to work -- I never got a new one of those when I upgraded from system disk 4.0 to 5.x, or if I did I can't find it. TMPLee@dockmaster.ncsc.mil
rond@pro-grouch.cts.com (Ron Dippold) (08/13/90)
In-Reply-To: message from UD182050@NDSUVM1.BITNET Well, the code for the IIgs /RAM5 disk isn't the fastest in the world. Glen Bredon even had a program that would create a RAMdisk that was about 2-3 times faster. ------------------------------------------------------------------------------ UUCP: crash!pro-grouch!rond | "Where knowledge ends, ARPA: crash!pro-grouch!rond@nosc.mil | Religion begins" INET: rond@pro-grouch.cts.com | - Benjamin Disraeli