From owner-freebsd-fs@FreeBSD.ORG Mon Aug 13 08:19:37 2012 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 1F501106566C for ; Mon, 13 Aug 2012 08:19:37 +0000 (UTC) (envelope-from prvs=15723815ec=killing@multiplay.co.uk) Received: from mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) by mx1.freebsd.org (Postfix) with ESMTP id 9FE3F8FC0A for ; Mon, 13 Aug 2012 08:19:36 +0000 (UTC) X-Spam-Processed: mail1.multiplay.co.uk, Mon, 13 Aug 2012 09:18:21 +0100 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on mail1.multiplay.co.uk X-Spam-Level: X-Spam-Status: No, score=-5.0 required=6.0 tests=USER_IN_WHITELIST shortcircuit=ham autolearn=disabled version=3.2.5 Received: from r2d2 ([188.220.16.49]) by mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) (MDaemon PRO v10.0.4) with ESMTP id md50021207661.msg for ; Mon, 13 Aug 2012 09:18:19 +0100 X-MDRemoteIP: 188.220.16.49 X-Return-Path: prvs=15723815ec=killing@multiplay.co.uk X-Envelope-From: killing@multiplay.co.uk X-MDaemon-Deliver-To: freebsd-fs@freebsd.org Message-ID: <22BACE55A93F4888AA2B38387FFBF971@multiplay.co.uk> From: "Steven Hartland" To: "Petri Helenius" , References: <7BDA02A3-99ED-4F67-9B2D-5AAF1523642E@helenius.fi> Date: Mon, 13 Aug 2012 09:18:38 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 Cc: Subject: Re: zero deleted blocks 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: Mon, 13 Aug 2012 08:19:37 -0000 Sounds like you may be talking about delete / trim support? If so UFS supports BIO_DELETE via -t on newfs or on an existing FS via tunefs -t enable ZFS doesn't currently BIO_DELETE but should soon as we've sponsored a project to add it, just waiting on it being committed. I've got a patch against 8.3-RELEASE if your interested in testing. It does require support from the underlying layers. cam ata supports it but cam da doesn't but again we have a patch for that if you want to test. Regards Steve ----- Original Message ----- From: "Petri Helenius" To: Sent: Monday, August 13, 2012 7:01 AM Subject: zero deleted blocks Hi, Is it possible to have ZFS or UFS to zero out the deallocated blocks to facilitate VM disk compaction? Pete _______________________________________________ freebsd-fs@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-fs To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.