From owner-freebsd-fs@FreeBSD.ORG Fri Mar 4 21:15:17 2011 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 4694F106564A for ; Fri, 4 Mar 2011 21:15:17 +0000 (UTC) (envelope-from gallasch@free.de) Received: from smtp.free.de (smtp.free.de [91.204.6.103]) by mx1.freebsd.org (Postfix) with ESMTP id A9C658FC1B for ; Fri, 4 Mar 2011 21:15:16 +0000 (UTC) Received: (qmail 8719 invoked by uid 98); 4 Mar 2011 21:48:34 +0100 Received: from 91.204.4.103 by smtp.free.de (envelope-from , uid 82) with qmail-scanner-1.25 (clamdscan: 0.96.5/12494. Clear:RC:1(91.204.4.103):. Processed in 0.04103 secs); 04 Mar 2011 20:48:34 -0000 X-Qmail-Scanner-Mail-From: gallasch@free.de via smtp.free.de X-Qmail-Scanner: 1.25 (Clear:RC:1(91.204.4.103):. Processed in 0.04103 secs) Received: from smtp.free.de (HELO [192.168.1.119]) (gallasch@free.de@[91.204.4.103]) (envelope-sender ) by smtp.free.de (qmail-ldap-1.03) with AES128-SHA encrypted SMTP for ; 4 Mar 2011 21:48:34 +0100 From: Kai Gallasch Content-Type: text/plain; charset=us-ascii Message-Id: Date: Fri, 4 Mar 2011 21:48:34 +0100 To: freebsd-fs@freebsd.org Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Apple Message framework v1082) X-Mailer: Apple Mail (2.1082) Subject: gmirror + gjournal and write cache on drives enabled 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: Fri, 04 Mar 2011 21:15:17 -0000 Hi. I'm currently installing a server with 4 x SAS JBOD connected to an = mpt(4) pseudo-raid controller. # gmirror status Name Status Components mirror/gm0 COMPLETE da0 da1 /dev/mirror/gm0s1a.journal / /dev/mirror/gm0s1d.journal /var /dev/mirror/gm0s1e.journal /usr /dev/mirror/gm0s1f.journal /usr/local /dev/mirror/gm0s1g.journal /usr/src /dev/mirror/gm0s1h.journal /usr/obj in gjournal(8) I read: "When gjournal is configured on top of gmirror(8) or graid3(8) = providers, it also keeps them in a consistent state, thus automatic = synchronization on power failure or system crash may be disabled on those providers." Is this statement also true, if the JBODs have their write-cache = enabled? If yes, I'd gladly "gmirror configure -F" to avoid a full sync in case = of a server crash, power loss, etc. Kai.=