Date: Fri, 22 Nov 2002 08:19:59 +0100 From: Cliff Sarginson <cls@raggedclown.net> To: FreeBSD List <questions@FreeBSD.ORG> Subject: Re: A question of where to put swap Message-ID: <20021122071959.GG83161@raggedclown.net> In-Reply-To: <20021122000458.GA79549@happy-idiot-talk.infracaninophi> References: <20021121234453.GA62470@raggedclown.net> <20021122000458.GA79549@happy-idiot-talk.infracaninophi>
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On Fri, Nov 22, 2002 at 12:04:58AM +0000, Matthew Seaman wrote: > On Fri, Nov 22, 2002 at 12:44:54AM +0100, Cliff Sarginson wrote: > > I am in the business of re-arranging my disk layouts to reflect the > > realities if life :) > > My FreeBSD system currently runs on a SCSI-3 Disk, but I have two > > modern, fast IDE disks that will be gaining a considerable amount of > > free space in the re-arrangements. I tend to run during the course of > > the day several extremely memory loving programs which cause > > paging/swapping to occur. I would like opinions on whether I would > > notice an improvement if I moved the swap area (which lives on the SCSI > > disk with the rest of the system) to the front of one of the IDE disks. > > I intend to make a new slice on the IDE disk anyway. > > A good thing to do is to put a swap partition on each disk[*]. That > permits the system to maximize IO throughput while paging. You can > divide up your total required swap space between the three disks > however you want, but remember that to be able to get a system crash > dump, you need at least one of your swap areas to be slightly larger > than the amount of RAM in your machine. Having approximately equally > sized swap areas gets the absolute maximum performance out of the > machine --- see The Handbook, Section 6.2.1.2 > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-initial.html > All good reminders, I think that is what I will end up doing. > > [*] so long as the IDE drives are on different channels --- you won't > gain anything by having swap areas (or any areas of high disk IO for > that matter) on both Master and Slave on the same channel. > Oh yes, they are, the other channels are a DVD player and a CD burner. Thanks. -- Regards Cliff Sarginson The Netherlands [ This mail has been checked as virus-free ] To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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