From owner-freebsd-questions@FreeBSD.ORG Sat Feb 17 20:34:25 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 6E5C516A408 for ; Sat, 17 Feb 2007 20:34:25 +0000 (UTC) (envelope-from kirk@strauser.com) Received: from kanga.honeypot.net (kanga.honeypot.net [208.162.254.122]) by mx1.freebsd.org (Postfix) with ESMTP id 2E13113C48D for ; Sat, 17 Feb 2007 20:34:25 +0000 (UTC) (envelope-from kirk@strauser.com) Received: from localhost (localhost [127.0.0.1]) by kanga.honeypot.net (Postfix) with ESMTP id 42ECA20B40B for ; Sat, 17 Feb 2007 14:34:20 -0600 (CST) X-Virus-Scanned: amavisd-new at honeypot.net Received: from kanga.honeypot.net ([127.0.0.1]) by localhost (kanga.honeypot.net [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id T0ceQfcnRlww for ; Sat, 17 Feb 2007 14:34:17 -0600 (CST) Received: from janus.daycos.com (janus.daycos.com [10.45.12.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by kanga.honeypot.net (Postfix) with ESMTP id 66C0D20B403 for ; Sat, 17 Feb 2007 14:34:17 -0600 (CST) From: Kirk Strauser To: freebsd-questions@freebsd.org Date: Sat, 17 Feb 2007 14:34:11 -0600 User-Agent: KMail/1.9.6 X-Face: T+/_{qmjgbosI0J/e83I~w[&VF'w)!((xEpj///^bA/6?jHHS?nq+T8_+`nh"WnEWCWG, \}]Y2$)) =?utf-8?q?vLVz4ACChrEcb=7DCO=5EtYmMG=5C=0A=09ts=2Em=3F=5B7=5B6OwE*dAJ*9f+m?= =?utf-8?q?X=2E7R32qeN=5EDJ=5C?=(k@evW?IRQCy.^ MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart27907994.Xo71PBWzrl"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <200702171434.15077.kirk@strauser.com> Subject: A bottleneck in gstripe? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Feb 2007 20:34:25 -0000 --nextPart27907994.Xo71PBWzrl Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline I built a gstripe volume with 4 drives and a 128KB stripesize. When runnin= g=20 one particular application, gstat reports that stripe/stripe1 is 99% busy,= =20 although its four drives are running at less than 30% each. Am I=20 misinterpreting the numbers - maybe the total is the sum of the drives? -=20 or is there some giant overhead that I'm missing? I've set kern.geom.stripe.fast=3D1, and kern.geom.stripe.fast_failed stays = at=20 0. I don't have enough experience with geom_strip to even know where to go= =20 from here. Are stripe sizes likely to make much of a difference when the=20 heaviest load is when PostgreSQL is receiving massive imports? This is a=20 production system and I don't have the opportunity to play with it as much= =20 as I'd like, so any pointers to experiments likely to make a difference=20 would be most welcome. =2D-=20 Kirk Strauser --nextPart27907994.Xo71PBWzrl Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- iD8DBQBF12bH5sRg+Y0CpvERAi18AKCC/t+h1h7FoEZtKmADCWjjEyWDGgCfcghd gL6arVFJzsGbZkHdE8h0W6s= =MVCY -----END PGP SIGNATURE----- --nextPart27907994.Xo71PBWzrl--