From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexy Khrabrov Subject: Re: Wide negotiation fails with 80->68 LVD adapter? Date: Sat, 26 Oct 2002 10:53:09 -0400 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <20021026145309.GA7695@angle.setup.org> References: <200210210514.g9L5ElYp006401@angle.badbox.com> <20021021163424.GE28914@redhat.com> <20021022032435.GA11986@angle.setup.org> <3DB4E275.BC760EDE@ix.netcom.com> <20021022161644.GA15234@angle.setup.org> <20021022170316.GA31085@redhat.com> <20021022221958.GA17112@angle.setup.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20021022221958.GA17112@angle.setup.org> List-Id: linux-scsi@vger.kernel.org To: Alexy Khrabrov Cc: linux-scsi@vger.kernel.org OK, I've got the CSC (Corpsys) "sca2lvd" adapters and tried them with my Barracuda ST150176LC's. The adapters look much more solid than the anonymous Taiwan-made "v1.1" ones. The CSC adapters have two ig red LEDs onboard, the inner part of the circuit board has a cover, etc. However, they too failed to spin my drives at 160, only at 80. I went back and enabled Wide Negotiation, then trying to set speed at 160 caused Adaptec 7899 to recognize the drives as ASYN, hangup, decreasing it to 80 led to their recognition as 80 and working fine. I went back and tried the "v1.1" adapters in that setting, Wide Negotiation enabled, 80 sync speed, and they worked at the same speed (as measured by copying a 5 GB from the 160 drive). Doh. So I reread the drive manual, which says that Barracuda 50 drives support ANSI SCSI, SCSI-2 and SCSI-3 (Fast-20 and Fast-40), which it says are the same as Ultra-1 and Ultra-2 for Fast-20/40, respectively. Mysteriously, Ultra2 is referred to as Ultra80 elsewhere, so looks like Fast-40 _is_ 80? If SCSI veterans could clarify this, I'd see how 40=80... Especially, given aic7xxx says something about 80 (40 MHz) in parentheses... In all cases, seems that it's really the drive, Barracuda 50 family is Ultra2 <=> Ultra80 (right?) but I was able to enable Wide Negotiation and set speed to 80, and aic7xxx v6.2.8 showed them registered at 80. I'm just curious if I still could kinda spin them up to 160 anyways... :-) Hence, so far, both SCA<->68 LVD adapters worked as advertised. I'm going to get a real 160 SCA drive and test it further. In the same vein, if I do end up getting an Ultra 320 card, and I will get an Adaptec one, what should I look for in the drive to see if it's capable of supporting 320? I'm interested in Ultra160 drives, usually SCA ones I can get at closeouts, but I heard (in the Ultra320 thread) that they can spin at 320 in case they support "HBA" -- can someone please elaborate? Many thanks, I'll put together a SCA<->68 mini-HOWTO based on this. -- Cheers, Alexy Khrabrov :: www.setup.org :: Age Quod Agis