Date: Wed, 29 Sep 2004 12:01:33 +0200 (CEST) From: "Per Engelbrecht" <per@xterm.dk> To: <freebsd-hardware@freebsd.org> Subject: Re: Re[2]: Max memory + swap Message-ID: <57647.62.242.151.142.1096452093.squirrel@mailbox.wingercom.dk> In-Reply-To: <471817753062.20040929094233@playstos.com> References: <471817753062.20040929094233@playstos.com>
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Hi Alessandro (please use 72 char. per line) > Tuesday, September 28, 2004, 10:13:34 AM, ha scritto: > >>> I was thinking of installing 1 Gb of RAM plus another Gigabytes >>> of swap. > > PE> 'pstat -s' will tell you if you need more phy. ram. > > Of course, but since I'm planning to buy this new server just now > I'ld add more RAM on its list, instead of buying it after few > weeks. > >>> (without PAE or similar things, it's a "normal" P4 machine) > > PE> You have to use kernel PAE option if your fbsd4.x box should be > able to PE> use anything above 4gb of ram. The installation can se > the total amount PE> of ram, but can't use it - unless you compile > the kernel with PAE option. > > so you too confirm swap space is NOT included in this math ? > 2 Gb RAM + 4 Gb swap would work without enabling PAE ? Phy. ram and swap space are two different things. The PAE option deals with phy. ram allocation/management in the kernel. Swap has nothing to do with this. It's merly a "helping hand" for systems running out of ram ... which you can "test" the use of/need for with 'pstat' (and 'wmstat') as I mentioned in my previous mail. > > I'm afraid of PAE because of some "glitches" I read about with some > HD controller drivers. Without PAE I feel more "safe" :) > This will be a _very_ critical production server and I'm just > taking all precautions I can in order to gain maximum availabily > and > stability. There's no "glitches" with PAE. If HA is such a big issue, the amount of ram should not be an issue in the first place - buy big. Don't get offended, but if it's because you don't like to recompile a kernel (just guessing) read the documentation on the fbsd site - it's a dicipline you'll have to master (it's easy and it's mandatory). > > PE> Don't know about limits in fbsd5.x but I'm sure it's "fixed". > > Unfortunately for my purposes 5.x is not yet an option, also if I'm > waiting 5.3-rel. for start an our own internal test program :) The 5.x branch is differnt from the 4.x branche in a number of ways and 5.2[1] is a good place to start. Fbsd 5.3 is close to a release now, but if you have a sandbox don't wait. Start testing/playing now! > > >>> Anyone with similar experiences could, please, remember me actual >>> limits ? > > PE> I run production serveres fbsd4.10 with 4gb of ram and with PAE > compiled PE> into the kernel. > > How much swap space do you have configured, if any ? > May I ask you, if possible, which HD controller drivers are you > using ? (reply in private mail if you think it's better ;) ) fbsd4.10, Xeon, 4gb ram, 1024m swap (swap use 0), AIC-7990 (U320 / ahd) This is a public maillist thread, why should I feel better by posting my answer directly to you ? /per per@xterm.dk > > PE> P.S. don't cross-post a thread to several liste like you've > done with PE> this one. Stick to one and only one list. People are > kind enough to PE> point you to another list if you're on the wrong > one. > > Yep, sorry but I was not sure which list was the correct one for my > question ;) :( > > > Many thanks !! > > > -- > > Alessandro de Manzano > > System & Network Administrator > Playstos - TIMA S.p.A. > Corso Sempione 63 > 20149 Milano, Italy > > tel.: +39-023314153 > fax : +39-02315678 > email: demanzano@playstos.com > > http://www.playstos.com
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