16 messages in org.freebsd.freebsd-stableRe: Dump takes ages on SCSI. (severa...| From | Sent On | Attachments |
|---|---|---|
| David Gilbert | Jul 2, 2000 1:24 pm | |
| Kent Stewart | Jul 2, 2000 2:53 pm | |
| David Gilbert | Jul 2, 2000 5:42 pm | |
| Kent Stewart | Jul 2, 2000 6:50 pm | |
| Chad R. Larson | Jul 2, 2000 8:44 pm | |
| David Gilbert | Jul 2, 2000 9:25 pm | |
| Kenneth D. Merry | Jul 2, 2000 10:55 pm | |
| David Malone | Jul 3, 2000 12:01 am | |
| kostik | Jul 3, 2000 1:35 am | |
| Gerhard Sittig | Jul 3, 2000 10:38 am | |
| Mike Smith | Jul 3, 2000 6:57 pm | |
| Mike Smith | Jul 4, 2000 4:08 am | |
| Mike Smith | Jul 4, 2000 5:22 am | |
| Gerhard Sittig | Jul 4, 2000 10:16 am | |
| Mike Smith | Jul 6, 2000 2:36 am | |
| Don Lewis | Jul 14, 2000 1:36 am |
| Subject: | Re: Dump takes ages on SCSI. (several times faster on IDE) | |
|---|---|---|
| From: | Gerhard Sittig (Gerh...@gmx.net) | |
| Date: | Jul 3, 2000 10:38:12 am | |
| List: | org.freebsd.freebsd-stable | |
On Sun, Jul 02, 2000 at 20:44 -0700, Chad R. Larson wrote:
As I recall, David Gilbert wrote:
I have a PIII/450 with a venerable Adaptec 2940UW and a Quantum 9G SCSI disk.
Oh, man. You're making me feel old. A 2940UW is "venerable"? What's that make my 1540C?
I didn't watch the start of the thread, but are _you_ the one complaining about the duration of SCSI operations? And is this controller installed in a machine with PCI slots?
If so, I'm very tempted to scream out loud "Aha!". If not, never mind. :)
The Problem with aha1542 (ISA busmaster capable controller) in PCI boards is that it is located "at the end" of a long chain to memory. Chances are, busmastering will not work at all behind the PCI to ISA bridge since all the PCI devices have higher priority and the ISA gadget never gets any access granted or at least always too late. You're better off with a PCI controller.
Another thing bubbles up: When adaptec switched from 1542B to 1542C people moaned about "nothing works any longer". But it just was that suddenly sloppy (cheap) cable caused problems when it worked before due to the "better" signal form of the new electronics (sorry, I lack better words, but the signal was "sharpened" in the new model which definitely is an improvement). It's just that now fell back what the user did wrong before. This is much like hardware failing under UNIX when it has been working for years under DoS.
virtually yours 82D1 9B9C 01DC 4FB4 D7B4 61BE 3F49 4F77 72DE DA76 Gerhard Sittig true | mail -s "get gpg key" Gerh...@gmx.net
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