Date: Wed, 9 Feb 2000 10:51:41 +1030 From: Greg Lehey <grog@lemis.com> To: Rowan Crowe <rowan@sensation.net.au>, freebsd-isp@FreeBSD.ORG Subject: vinum (was: Performance of FreeBSD and MS Windows. What about select() and memory management etc ?) Message-ID: <20000209105141.A41453@freebie.lemis.com> In-Reply-To: <20000207183235.A6558@phoenix.welearn.com.au> References: <20000207114238.G22697@freebie.lemis.com> <Pine.BSF.4.01.10002071224470.23293-100000@velvet.sensation.net.au> <20000207120802.K22697@freebie.lemis.com> <20000207183235.A6558@phoenix.welearn.com.au>
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On Monday, 7 February 2000 at 18:32:37 +1100, Jonathan Michaels wrote: > On Mon, Feb 07, 2000 at 12:08:02PM +1030, Greg Lehey wrote: >> On Monday, 7 February 2000 at 12:29:54 +1100, Rowan Crowe wrote: >>> On Mon, 7 Feb 2000, Greg Lehey wrote: >>> >>>> On Monday, 7 February 2000 at 11:40:43 +1100, Stanley Hopcroft wrote: >>> >>> [...] >>> >>>> Getting back to your own experience: by default, FreeBSD doesn't do >>>> DMA on IDE drives. It's possible that the perceived performance would >>>> be much better with DMA. In addition, kde is a known memory hog. >>> >>> Do you know of any pointers to increasing the performance (in general) of >>> FreeBSD's IDE drivers by tweaking the kernel settings? >> >> There's not too much else you can do, apart from setting DMA and >> maximum transfer length. Note that the current driver is going away. >> Even the upcoming 4.0 release will have the new driver, at, which >> should be a lot better. In particular, there's a known problem with >> the wd (old) driver with partitions over 27 GB in size. These *must* >> be run in LBA mode. See wd(4) for more details. > > > by way of similar path .. would it be possible to marry > acouple of ide (9 Gb) drives into a vinum styled single > "drive", and then to integrate the following logical array ? > > would it be possible to make up a big drive array from a > couple of 2 Gb ide drives and a couple of 1 Gb scsi2 drives. Yes. > what sort of perforrmance issues. compatability issues would i > have to look at. Many. Take a look at http://www.lemis.com/vinum.html for a start. Greg -- Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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