Date: Mon, 23 Aug 1999 11:14:06 -0700 From: Steve Khoo <steve@gordian.com> To: Mark Salyzyn <salyzyn_mark@dpt.com> Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: dpt scsi smartraid iv controller, in raid 5 mode... ? Message-ID: <37C18F6E.4FD79CD1@gordian.com> References: <199908191539.AA17493@bohica.dpt.com>
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Mark Salyzyn wrote: > > 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. I saw that announcement. Too bad it wasn't for 3.2. Otherwise I would have a nice file server with DPT V up and running by now. > > 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. This sounds cool. Any idea if simon's version is going to have something similar? > Simon Shapiro is working on a higher performance Monolithic driver > which should be out real soon. Any idea when "real soon" is? I need to put together a system soon, and would much prefer to use a DPT V. > >> 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. SEK -- Steve E. Khoo GORDIAN Systems Manager 20361 Irvine Ave. Internet: steve@gordian.com Santa Ana Heights, CA 92707 Voice:(714)850-0205 Fax:(714)850-0533 HTTP://WWW.GORDIAN.COM Wanna be blacklisted by our spam filter? mailto: aablme@gordian.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the messagehelp
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