Date: Wed, 11 Nov 1998 18:30:36 +0100 (CET) From: Søren Schmidt <sos@freebsd.dk> To: cracauer@cons.org (Martin Cracauer) Cc: john@isi.co.jp, grog@lemis.com, hackers@FreeBSD.ORG, mike@smith.net.au, ticso@cicely.de Subject: Re: SCSI vs. DMA33.. Message-ID: <199811111730.SAA01133@freebsd.dk> In-Reply-To: <19981111164136.A29513@cons.org> from Martin Cracauer at "Nov 11, 1998 4:41:36 pm"
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It seems Martin Cracauer wrote:
>
> I'm just trying to build a CCD system with two PCI UDMA controllers by
> Promise and 4 IBM DDTA 8 GB drives. Given that I often stream over
> very large files and that I paid much less than half the money per
> Megabyte than for SCSI disks the IDE solution sounds good.
Yup, it actually works pretty well, and it sure beats everything
else in cost pr MB.
> Guess what: While I can use the two PCI cards simultaneously, I can't
> do so for the two channels on each card, although they are even two
> completely independent chips on each Promize card. Since I don't have
> enough PCI slots for 4 cards (and these things cost money) and my
> motherboard doesn't do UDMA, I'm stuck with performance like my SCSI
> CCD with two Atlas drives. That isn't too bad, but not what I hoped
> for.
>
> Maybe it's a problem with our Promise driver? I already contacted John
> Dyson, but no response yet. Anyone else can think of a solution?
Hmm, it works for me, I have this little tweak to wd.c though,
without it the promise sometimes blows up...
Index: wd.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/isa/wd.c,v
retrieving revision 1.178
diff -u -r1.178 wd.c
--- wd.c 1998/10/22 05:58:41 1.178
+++ wd.c 1998/11/06 16:23:26
@@ -349,9 +349,11 @@
goto reset_ok;
#endif
DELAY(RECOVERYTIME);
+/* sos
if (wdreset(du) != 0) {
goto nodevice;
}
+*/
reset_ok:
/* execute a controller only command */
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Søren Schmidt (sos@freebsd.org) FreeBSD Core Team member
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