Date: Mon, 24 Nov 1997 21:13:31 -0800 (PST) From: Simon Shapiro <shimon@simon-shapiro.org> To: Ricardo Kleemann <ricardo@americasnet.com> Cc: freebsd-scsi@freebsd.org, "N.Del More" <noel@inr.net> Subject: Re: DPT PM2144UWR Message-ID: <XFMail.971124211331.shimon@Simon-Shapiro.ORG> In-Reply-To: <Pine.LNX.3.95.971120180436.12632B-100000@linux1.americasnet.com>
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On 21-Nov-97 Ricardo Kleemann wrote: > Hi, > > That sounds wonderful. Couple of questions: > > 1. If there IS a freebsd driver, where would I find it? ftp://simon-shapiro.org/crash. Boot floppies in /FreeBSD > 2. Can you explain to me how the RAID 5 works on the DPT? For > example, how > is recovery done upon failure of one of the drives? I'll stick to the example... :-) One of three ways: a. On the DEC StorageWorks cabinet (DPT 9W, etc), the dead drive blinks yellow. You pull it out and put a new one. b. Shutdown the machine, unplug the bad drive, plug in a new, same or larger capacity drive, boot and wait for the drive lights to stop glowing. c. Boot DOS, start DPTMGR, click the mouse on the array. Click on REBUILD. I could tech you how to recover from total failure (more than one drive in the array failing) too, but DPT support likes to have this trick up THEIR sleeve :-) If you have money/space, you can leave a drive ``unused'' in the disk bay and tell DPT to use it as a ``Hot Spare''. It will then go to service automatically, with no shutdown even on non-hot cabinets. You can have multiple hot Spares, but they do not cross controller boundries. > 3. In RAID 5 mode, how does the diskspace work out? What I mean is > how do > you calculate it? (N-1) 5 drives give you useful sorage equal to 4/5 the total capacity. It's easy for RAID 0 (add the drives), RAID 1 is > the > total divided by the number of mirrors. RAID-1 is 2*N where N is disk capacity. RAID-1 is only two drives. But in RAID 5 what's the > calculation? If I use 3 2.5Gb drives, how much total space would I > have? See above. > > thanks > Ricardo > > On Thu, 20 Nov 1997, N. Del More wrote: > >> I've been told that their is a driver available for it, frankly, I >> HOPE >> that the FreeBSD org begins supporting the DPT cards since it works >> the >> absolute NUTS under BSDI!! >> >> Not only that, but it's almost "sexy" to watch in action!! All them >> neat >> LED's on the card blinkin' and flashin' (woohoo!!). >> >> Seriously though, it dropped right into the BSDI server, and came up >> screaming with a couple of Barracuda's attached. Not only that but >> it >> concurrently supports SCSI/SCSI-2 (8 bit) on a separate channel, has >> the >> RAID add-on card. and up to 64 MB of cache. >> >> Finally, the Adaptec 2940 that resided in the box beforehand, >> couldn't even >> handle patching the kernel without doing each patch one at a time to >> avoid >> a kernel panic and shutdown. The DPT flew through it, and on a >> Pentium 233 >> with 128 Mb. RAM applied all of the 3.0 -> 3.1 BSDI patches in 1 >> min., 3 >> sec. A fellow ISP who was helping me with the upgrade suggested I >> might >> not get out of his house with it. >> >> I've used Adaptec for years, but now I'm hooked on DPT!! >> >> Noel >> >> At 10:30 AM 11/20/97 -0800, you wrote: >> >can anyone confirm freebsd supports the DPT raid controller >> >(2144UWR)? >> >> >> >> +------------------------------+ >> +---------------------------------+ >> | N.B. Del More noel@inr.net \ \ An Internet Connection? >> | Sure!| >> | inr.NET \ \ Do you want to be on >> | | >> | InterNet Resource Networks, LLC \ \ diss.net ? >> | | >> | http://www.inr.net \ \ datt.net ? >> | | >> | http://www.diss.net \ \ or do you just wanna be >> | | >> | http://www.datt.net \ \ on da inr.net ? >> | | >> +-------------------------------------+ >> +--------------------------+ >> > If Microsoft Built Cars: There would be an "Engine Pro" with bigger turbos, but it would be slower on most existing roads. Sincerely Yours, Simon Shapiro Shimon@Simon-Shapiro.ORG Voice: 503.799.2313
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