Date: Thu, 19 Aug 1999 11:39:37 -0400 From: Mark Salyzyn <salyzyn_mark@dpt.com> To: <freebsd-scsi@freebsd.org> Subject: Re: dpt scsi smartraid iv controller, in raid 5 mode... ? Message-ID: <199908191539.AA17493@bohica.dpt.com>
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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
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