From owner-freebsd-fs@FreeBSD.ORG Sun Nov 17 15:04:30 2013 Return-Path: Delivered-To: freebsd-fs@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 6190D1B2 for ; Sun, 17 Nov 2013 15:04:30 +0000 (UTC) Received: from woozle.rinet.ru (woozle.rinet.ru [195.54.192.68]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id DDEC92206 for ; Sun, 17 Nov 2013 15:04:29 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by woozle.rinet.ru (8.14.5/8.14.5) with ESMTP id rAHF4LS0069924 for ; Sun, 17 Nov 2013 19:04:21 +0400 (MSK) (envelope-from marck@rinet.ru) Date: Sun, 17 Nov 2013 19:04:21 +0400 (MSK) From: Dmitry Morozovsky To: freebsd-fs@FreeBSD.org Subject: ZFS: Memory needed for managing L2ARC Message-ID: User-Agent: Alpine 2.00 (BSF 1167 2008-08-23) X-NCC-RegID: ru.rinet X-OpenPGP-Key-ID: 6B691B03 MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.4.3 (woozle.rinet.ru [0.0.0.0]); Sun, 17 Nov 2013 19:04:21 +0400 (MSK) X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.16 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 17 Nov 2013 15:04:30 -0000 Dear colleagues, are there any "real" estimations on how much memory is needed for having efficient, say, 1T of L2ARC? stable/amd64, of course. I have backup storage server, where pool size is targeted to a few hundreds of terabytes (currently ~35T), and hot set is usually less than 512G-1T. quick googling leads to some Solaris/Illumos documents, but even them are not bright enough in answer that. Thanks! -- Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] [ FreeBSD committer: marck@FreeBSD.org ] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** ------------------------------------------------------------------------