From owner-freebsd-questions@freebsd.org Tue May 21 15:01:54 2019 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C5E8115AFDBF for ; Tue, 21 May 2019 15:01:54 +0000 (UTC) (envelope-from johnl@iecc.com) Received: from gal.iecc.com (gal.iecc.com [IPv6:2001:470:1f07:1126:0:43:6f73:7461]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "gal.iecc.com", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 2422269F6A for ; Tue, 21 May 2019 15:01:54 +0000 (UTC) (envelope-from johnl@iecc.com) Received: (qmail 33672 invoked from network); 21 May 2019 15:01:52 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=iecc.com; h=date:message-id:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding; s=837e.5ce412e0.k1905; i=johnl-iecc.com@submit.iecc.com; bh=G2TMN18asdQWpu008fvj6eMqjwoBX+Lt87wdTqamppc=; b=QXA79hzfBWUnaHKrcU+5ThS/Lf88w9fi36QEEEwHL8FqukZdA4AI8L2OtBlwNJOMlY2npWGqqxKC6E0wlsjGMj4Cv9TanfBMkZGn48Q/2+iY7KRCDyABfg6l9wWUiXWxVJuEEJmATMjpfHGrRpjL1MKwuZnYERlIndYNQGUBKfBr1mMsAVkmy5cGFc3J66Aqq1nuUpy6ZPOBmJq/QQh0XcaXTWLQzWezF2JqbKWPJL9qbKHxqcLzAbgj2i3Atz6s Received: from ary.qy ([64.246.232.221]) by imap.iecc.com ([64.57.183.75]) with ESMTPSA (TLS1.2 ECDHE-RSA AES-256-GCM AEAD, johnl@iecc.com) via TCP; 21 May 2019 15:01:52 -0000 Received: by ary.qy (Postfix, from userid 501) id 01D8D20145C597; Tue, 21 May 2019 11:01:50 -0400 (EDT) Date: 21 May 2019 11:01:50 -0400 Message-Id: <20190521150152.01D8D20145C597@ary.qy> From: "John Levine" To: freebsd-questions@freebsd.org Subject: Re: USB to increase RAM In-Reply-To: Organization: Taughannock Networks X-Headerized: yes Mime-Version: 1.0 Content-type: text/plain; charset=utf-8 Content-transfer-encoding: 8bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 May 2019 15:01:54 -0000 In article you write: >Windows has a feature called "ReadyBoost" that can use a USB drive to >increase RAM. ReadyBoost uses an SSD as a cache between RAM and the regular disk. More details here: https://en.wikipedia.org/wiki/ReadyBoost To do more or less the same thing with ZFS, add the USB disk as a cache device to your disk pool. Look at the zpool man page, and search for "Cache devices".