From owner-freebsd-fs@FreeBSD.ORG Tue Apr 20 23:49:04 2010 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2FC74106566B for ; Tue, 20 Apr 2010 23:49:04 +0000 (UTC) (envelope-from pjd@garage.freebsd.pl) Received: from mail.garage.freebsd.pl (chello089077043238.chello.pl [89.77.43.238]) by mx1.freebsd.org (Postfix) with ESMTP id 734838FC2C for ; Tue, 20 Apr 2010 23:49:03 +0000 (UTC) Received: by mail.garage.freebsd.pl (Postfix, from userid 65534) id 9D1A945E8F; Wed, 21 Apr 2010 01:49:01 +0200 (CEST) Received: from localhost (chello089077043238.chello.pl [89.77.43.238]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.garage.freebsd.pl (Postfix) with ESMTP id 753BE45E82; Wed, 21 Apr 2010 01:48:56 +0200 (CEST) Date: Wed, 21 Apr 2010 01:48:58 +0200 From: Pawel Jakub Dawidek To: Lorenzo Perone Message-ID: <20100420234858.GC1737@garage.freebsd.pl> References: <4BCE1274.1070903@yellowspace.net> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="96YOpH+ONegL0A3E" Content-Disposition: inline In-Reply-To: <4BCE1274.1070903@yellowspace.net> User-Agent: Mutt/1.4.2.3i X-PGP-Key-URL: http://people.freebsd.org/~pjd/pjd.asc X-OS: FreeBSD 9.0-CURRENT i386 X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on mail.garage.freebsd.pl X-Spam-Level: X-Spam-Status: No, score=-0.6 required=4.5 tests=BAYES_00,RCVD_IN_SORBS_DUL autolearn=no version=3.0.4 Cc: freebsd-fs@freebsd.org Subject: Re: HAST: question about secondary outage time X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Apr 2010 23:49:04 -0000 --96YOpH+ONegL0A3E Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Apr 20, 2010 at 10:45:40PM +0200, Lorenzo Perone wrote: >=20 > Hello, >=20 > Welcome to HAST in 8/stable! Happy to see it around. >=20 > The manual states..: >=20 > >When primary hastd is unable to connect or connection fails, > >it will try to re-establish connection every few seconds. > >Once connection is established, primary hastd will synchronize > >every extent that was modified during connection outage > >to the secondary hastd. >=20 > Question: For how long can a secondary be offline before a > full synchronisation becomes necessary? In other words, on which=20 > resources and/or tunables does this depend upon? There is no threshold that will trigger full synchronization. If secondary if offline even for a very long time, but primary wasn't modified much during that time, it will take very short while to sync. Full synchronization if only performed when clean provider is connected or in unlikely situation when every extent becomes dirty during secondary outage. > Great work pjd, I guess we're all big fans of all your GEOMs, and this=20 > is a welcome new one :) Thank you. --=20 Pawel Jakub Dawidek http://www.wheelsystems.com pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --96YOpH+ONegL0A3E Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAkvOPWkACgkQForvXbEpPzQgFgCg4f/STH8TlVDMGWh/NSXYuFJQ I2AAmwQDR7gaDt2532xw8PplqM+hEHB3 =IPi0 -----END PGP SIGNATURE----- --96YOpH+ONegL0A3E--