From owner-freebsd-scsi Thu Aug 19 8:40:24 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from dptnotes.dpt.com (dptnotes.dpt.com [206.138.241.6]) by hub.freebsd.org (Postfix) with SMTP id 1E09B150B0 for ; Thu, 19 Aug 1999 08:40:15 -0700 (PDT) (envelope-from salyzyn_mark@dpt.com) Received: from bohica.dpt.com ([198.242.63.84]) by dptnotes.dpt.com (Lotus SMTP MTA v4.6.4 (830.2 3-23-1999)) with SMTP id 852567D2.0056180C; Thu, 19 Aug 1999 11:40:22 -0400 Received: by bohica.dpt.com [198.242.63.84] (NX5.67g/NX3.0M) id AA17493; Thu, 19 Aug 1999 11:39:38 -0400 Reply-To: Mark Salyzyn Message-Id: <199908191539.AA17493@bohica.dpt.com> Mime-Version: 1.0 (NeXT Mail 4.2mach v148) Content-Type: text/enriched; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Nextstep-Mailer: Mail 4.2mach (Enhance 2.2p1) Received: by NeXT.Mailer (1.148) From: Mark Salyzyn Date: Thu, 19 Aug 1999 11:39:37 -0400 To: Subject: Re: dpt scsi smartraid iv controller, in raid 5 mode... ? Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org In article <<19990818085508.N7187@freebie.lemis.com>, you wrote: >I haven't heard of any bugs. I have heard suggestions that the RAID-5 >performance is even worse than RAID-5 has to be, but I don't have much >in the way of evidence. It will depend on the mix of FW you are using, cache and drives. DPT's RAID-5 performance typically exceeds what is expected (IMHO) due to our use of the cache on the controller, but can also suck for something as subtle as a bogus stripe size selection. >> while other people have said that dpt support doesn't know about the >> raid iv drivers. >I suppose that depends on who you get at DPT support. Since the IV generation driver was written by Simon Shapiro, DPT support (and DPT engineering) are at somewhat of a disadvantage. This is changing as they come up to speed. LINUX ran into a similar issues with Michael Neuffer effectively becoming a volunteer DPT support person instead of DPT providing the support. >> also there is rumor of support for the raid v card 'soon'. >Yes. There is a rumour. No rumor, I released the driver to any who would ask for it on August 3 and announced it here and in freebsd-hardware. Currently, only Mirapoint has taken to testing the driver. The driver provides passthrough, so we have a working native command line based configuration tool (dptutil). An engineer is working on porting the storage manager to the X11/LessTIF environment. This driver is a SCSI based driver. Simon Shapiro is working on a higher performance Monolithic driver which should be out real soon. >> please excuse the hotmail acct :/ >I will. My mail system won't :-) I get grumpy when I see email from earthlink, considering their gross indecency back in the Cantor and Siegel days and the ensuing spam ;-/. But I learned many years ago that it doesn't matter which country, or internet service, you are on, they are all people deserving of respect! ;-> Sincerely -- Mark Salyzyn ObjDisclaimer: I know nothing, and what I say does not represent DPT. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message